| HS Code | 993508 |
| Density | 0.905 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 65 g/10 min |
| Tensile Stress At Yield | 35 MPa |
| Tensile Modulus | 1750 MPa |
| Flexural Modulus | 1750 MPa |
| Rockwell Hardness R | 110 |
| Charpy Notched Impact Strength 23 C | 2.0 kJ/m² |
| Charpy Notched Impact Strength 20 C | 1.5 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 110 °C |
| Heat Deflection Temperature 1 8 Mpa | 60 °C |
| Vicat Softening Temperature | 155 °C |
| Melting Temperature | 165 °C |
As an accredited ExxonMobil PP Homopolymer PP1065KN factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packed in 25 kg woven polypropylene bags, palletized and stretch-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of ExxonMobil PP Homopolymer PP1065KN, securely packed in bags on pallets, protected and ventilated. |
| Shipping | Ship ExxonMobil PP Homopolymer PP1065KN as solid resin pellets in sealed, moisture-protective packaging. Store away from heat, ignition sources, and direct sunlight. Keep dry to prevent quality degradation. No special hazardous classification normally applies, but use proper lifting equipment for palletized loads and avoid prolonged exposure to high temperatures during transport. |
| Storage | Store ExxonMobil PP Homopolymer PP1065KN in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep packaging sealed to prevent moisture pickup and contamination. Avoid prolonged storage at elevated temperatures. Maintain indoors under stable conditions, and follow local regulations for polymer storage. |
| Shelf Life | Shelf life is typically 2 years from date of shipment when stored in original, unopened packaging under dry, cool conditions. |
High-cycle thin-wall injection molding of polypropylene homopolymer for single-serve dairy containers and delicatessen tubs imposes narrow processing latitude, where melt pressure consistency during injection velocities exceeding 300 mm/s directly governs sidewall thickness distribution and topload performance. Compliance with EU Regulation (EC) No 1935/2004 and FDA 21 CFR 177.1520(c) 1.1a is mandatory for these olefin polymers in direct food contact, with specific migration limits tested under EN 1186-1:2002 using simulant A (10% ethanol) and simulant D2 (vegetable oil) at 70°C for 2 hours. The polymer is processed at barrel temperature profiles ranging from 220°C at the feed throat to 255°C at the nozzle, with mold temperatures maintained between 10°C and 15°C via turbulent-flow chilled water circuits operating at Reynolds numbers exceeding 10,000 to ensure turbulent heat transfer at the mold steel interface. At the recommended processing melt temperature window of 230°C to 250°C, the melt flow rate of 106 g/10 min (measured per ISO 1133-1:2022 at 230°C/2.16 kg) enables filling of flow-length-to-wall-thickness ratios up to 380:1 in stack molds with 16+16 cavity configurations on 350-ton hydraulic toggle clamp injection molding machines equipped with accumulator-assisted injection units. At addition levels of 2.0 wt% to 4.5 wt% of a clarified random polypropylene copolymer masterbatch containing 1,2,3-trideoxy-4,6:5,7-bis-O-[(4-propylphenyl)methylene]-nonitol nucleating agent at 500 ppm active concentration, the crystallization temperature increases from approximately 112°C to 128°C (DSC cooling at 10°C/min per ISO 11357-3:2018), achieving cycle time reductions of 18% to 22% compared to unnucleated formulations. This nucleant package also induces a reduction in haze from approximately 55% to 12% on 1 mm injection-molded plaques tested per ASTM D1003-21 Procedure A, critical for consumer transparency perception. Molders must monitor screw recovery time drift exceeding 0.3 seconds as an early indicator of check ring wear in reciprocating screw plastication units, as backflow variation leads to cushion instability and short-shot defects in cavities at the extremities of geometrically unbalanced runner systems—a failure mode prevalent in 64-cavity hot-runner stack molds with naturally balanced but thermally imbalanced manifold layouts. Static dissipative properties are unmodified in this grade; accumulation of surface charge exceeding 15 kV on demolded containers in low-humidity environments below 30% RH causes dust attraction and stacking difficulties that require external ionizing air curtains or corona discharge neutralization bars positioned within 150 mm of the mold open position. Post-mold shrinking of thin-wall containers measured 24 hours after ejection is anisotropic, with machine-direction shrinkage of 1.2% to 1.6% and transverse-direction shrinkage of 1.5% to 1.9% per ASTM D955-08(2023), necessitating cavity dimension compensation factors specific to flow orientation rather than isotropic scaling. Finished articles include injection-molded round dairy tubs with wall thicknesses of 0.35 mm to 0.50 mm, rectangular deli containers with in-mold label compatibility tested to label-polymer interfacial adhesion exceeding 2.5 N/15 mm peel strength per ISO 8510-2:2006, and tamper-evident lids with integral hinge-molded living hinges capable of exceeding 100,000 flex cycles without stress whitening when the hinge thickness is maintained within 0.20 mm to 0.30 mm.
Production of meltblown nonwoven filtration media from high-melt-flow-rate polypropylene homopolymer on commercial meltblown lines requires precise characterization of the polymer's rheological response across the shear rate range encountered in spinneret die orifices, typically 10³ s⁻¹ to 10⁵ s⁻¹ at melt temperatures between 260°C and 300°C. The grade, when processed without peroxide visbreaking additives, delivers intrinsic melt flow rates suitable for direct meltblown conversion at die-to-collector distances of 150 mm to 400 mm and air manifold pressures of 0.7 bar to 2.1 bar, producing filaments with average diameters ranging from 1.5 μm to 5.0 μm as measured by SEM image analysis across 200 randomly selected fiber segments per sample per ISO 1973:2021 gravimetric methods. Compliance with EN 14683:2019 Type IIR bacterial filtration efficiency (BFE) requirements of ≥98% at 3.0 μm mean particle size and differential pressure ≤60 Pa/cm² is achieved at basis weights of 22 g/m² to 28 g/m² when the meltblown web is combined with spunbond polypropylene carrier layers in SMS (spunbond-meltblown-spunbond) composite constructions produced on tandem calendering lines operating at 80°C to 110°C bonding temperatures. Electret charging of meltblown polypropylene media via corona discharge at 15 kV to 30 kV with exposure times of 1.5 seconds to 3.0 seconds per pass increases particle capture efficiency from approximately 65% (uncharged, sodium chloride aerosol at 0.3 μm) to ≥95%, with charge decay rates monitored over 24 months of ambient storage at 23°C/50% RH required to remain above 80% initial filtration efficiency per NIOSH 42 CFR Part 84 accelerated aging protocols. Processing viscosity at the die exit is influenced by peroxide-based controlled rheology modifications; when introduced at 500 ppm to 1,200 ppm of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane in the extruder feed throat, the apparent melt viscosity at 1,000 s⁻¹ measured via capillary rheometry per ISO 11443:2021 at 260°C decreases from approximately 45 Pa·s to 18 Pa·s, enabling filament diameter reduction but simultaneously increasing the risk of shot (unattenuated polymer globules) in the web from acceptable levels below 5 per cm² to defect levels exceeding 20 per cm² if die-tip air temperatures fall below the polymer melting point. Meltblown die hole density typically runs 35 holes/inch to 60 holes/inch with capillary diameters of 0.20 mm to 0.35 mm and L/D ratios of 10:1 to 15:1; polymer throughput per hole ranges from 0.3 g/hole/min to 0.8 g/hole/min, and any throughput excursion beyond 1.0 g/hole/min shifts the melt fracture regime from sharkskin (surface roughness amplitude ≤0.5 μm) to gross melt fracture (amplitude >2 μm), causing web uniformity index below 0.85 (CV of basis weight >15%). End-use filtration articles span surgical face masks meeting ASTM F2100-23 Level 3 (BFE ≥98%, PFE at 0.1 μm ≥98%, fluid resistance ≥160 mm Hg, delta P < 6.0 mm H₂O/cm²), HVAC pocket filters achieving MERV 13 to MERV 15 ratings per ASHRAE 52.2-2017 with E1 efficiency of 50% to 85% for 0.3 μm to 1.0 μm particles, and industrial wipe substrates converted via hydroentanglement bonding of meltblown-spunbond laminates at water jet pressures of 150 bar to 250 bar.
Injection-blow-molded containers for sterile medical device packaging demand polypropylene homopolymer with consistent parison formation behavior across shot-to-shot variation within 2% of programmed injection volume, as fluctuations directly impact wall thickness uniformity in the blow cavity and subsequent ethylene oxide (EtO) sterilization gas permeation pathways. Sterile barrier compliance under ISO 11607-1:2019 and ISO 11607-2:2019 for terminally sterilized medical devices requires validation of seal strength per ASTM F88/F88M-23 with seal peel forces exceeding 1.5 N per 15 mm width when the container flange is heat-sealed to uncoated Tyvek 1073B or equivalent medical-grade flashspun high-density polyethylene lidstock at 140°C to 165°C sealing temperatures and 0.5 second to 1.5 second dwell times on rotary tray sealers operating at 15 cycles/min. The homopolymer is processed without slip agents or antiblock additives at loading levels that would exceed 0.1 wt%, as additive migration to seal surfaces reduces interfacial adhesion and generates particulate contamination above the 0.5 μm particle size threshold counted per ISO 8871-5:2016 at limits of 25 particles/mL for particles ≥10 μm and 3 particles/mL for particles ≥25 μm. Parison sag under gravitational loading in horizontal injection-blow-molding machines with preform transfer stations at mold-open times of 0.8 seconds to 1.2 seconds is influenced by the polymer's elongational viscosity; processing temperatures at the injection nozzle set-point of 230°C to 240°C maintain melt strength sufficient to limit parison diameter variation to ≤0.15 mm over 100 mm parison length. Biocompatibility evaluation per ISO 10993-5:2024 (cytotoxicity via MTT assay on L-929 mouse fibroblast cells with viability threshold ≥70% of negative control), ISO 10993-10:2021 (intracutaneous reactivity with erythema and edema indices of 0 at 24h, 48h, 72h observation points), and ISO 10993-11:2017 (acute systemic toxicity with zero mortality and zero signs of toxicity across 5 albino Swiss mice per test extract over 72 hours) confirm suitability for devices classified as surface-contacting with intact skin for limited contact duration (≤24 hours). Long-term ethylene oxide residuals testing per ISO 10993-7:2008 Annex E must confirm residual EtO below 4 mg/device after 7 days aeration at 40°C and ethylene chlorohydrin below 9 mg/device, values that correlate inversely with container wall thickness at the thinnest cross-sectional measurement point. Nucleation with sorbitol-based clarifiers at 1,000 ppm to 2,500 ppm active content, combined with mold cooling rates exceeding 40°C/min through the crystallization exotherm, produces container transparency with haze values below 10% on 1.2 mm wall sections per ASTM D1003-21, enabling visual inspection of packaged devices for discoloration or particulate contamination without container opacity interfering with automated vision system defect detection algorithms operating at 90% recognition accuracy thresholds. Gamma irradiation sterilization at doses of 25 kGy to 50 kGy per ISO 11137-2:2022 causes measurable embrittlement in homopolymer polypropylene; post-irradiation notched Izod impact strength at 23°C per ISO 180:2023 decreases from approximately 2.5 kJ/m² at 0 kGy to 1.2 kJ/m² at 50 kGy, limiting gamma sterilization applicability to single-use disposable devices where post-sterilization mechanical loading is confined to compressive stack forces during distribution. Free-fall drop testing from 900 mm height at -20°C per ISTA 3A protocols identifies brittle crack initiation sites at gate vestige geometries where frozen-in orientation stress concentrates; post-mold annealing at 120°C for 30 minutes reduces residual stress birefringence from approximately 450 nm to 150 nm retardation, improving low-temperature drop survival rates from 60% to >95% in 30-container test sequences. Finished articles include rigid containers for pre-filled saline syringes, peelable-pouch thermoformed trays for orthopedic implant kits with cavity depth-to-draw ratios up to 1:1.5, and protective transparent caps for luers and needle hubs assembled by automated pick-and-place systems.
Continuous compression-molded and injection-molded closures for carbonated soft drink (CSD) and still water beverages require a balance of low demolding force and adequate sealing performance that is directly influenced by nucleating system selection and mold surface finish at the plug seal engagement geometry. This application is governed by EU Regulation (EC) No 1935/2004 and FDA 21 CFR 177.1520(c) 1.1a for food contact, with the additional testing requirement of EU Regulation (EU) No 10/2011 overall migration limits of ≤10 mg/dm² on finished articles when tested with simulant D1 (50% ethanol) for 10 days at 40°C. In high-cavitation closure molds with 96 or 128 cavities operating on 6-second to 8-second cycle times, the homopolymer's crystallinity at the moment of ejection—typically 45% to 55% relative crystallinity as measured by DSC—determines core pull friction coefficients against polished tool steel with 0.025 μm Ra surface finish. At a nucleating agent loading of 800 ppm to 1,500 ppm of sodium benzoate or aluminum hydroxybis[2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate] in combination with acid scavenger calcium stearate at 400 ppm to 800 ppm, the crystallization onset temperature shifts upward by 12°C to 16°C, enabling ejection at higher part temperatures without deformation of the plug seal bead, which must maintain circularity within 0.15 mm total indicated runout to prevent post-capping leakage at 6 bar internal carbonation pressure per ASTM D4991-07(2023). The addition of erucamide slip agent at 500 ppm to 1,200 ppm reduces the coefficient of friction of the closure thread against the bottle neck finish from approximately 0.45 to 0.18 when tested per ASTM D1894-14(2023), with an industry-typical thermal blooming period of 48 hours at 40°C required to achieve equilibrium surface slip, during which removal torque values measured per ASTM D3475-22 decline from approximately 8.0 N·m to 2.5 N·m for closures with 28 mm PCO 1881 neck finishes. Melt filtration at 100 μm to 200 μm absolute retention rating is standard for closure molding to remove crosslinked gel particles that would otherwise accumulate at the plug seal circumferential parting line, creating leakage paths detectable at ≥0.01 cm³/minute helium leak rates. Compression-molding variant processing on rotary compression closure machines with 24 to 36 forming stations operates at melt temperatures of 215°C to 230°C and rotary table speeds of 15 rpm to 22 rpm, where polymer melt pellets of precisely 1.4 g to 2.2 g (sculptured to ±0.02 g variation) are compression-formed under 25 kN to 40 kN clamp force per station into finished closures with tamper-evident bands connected via frangible bridges of 0.20 mm to 0.30 mm width. A known operational failure mode is premature band tearing during application head capping at 1,200 bottles/min on rotary cappers; this initiates when bridge thickness exceeds 0.35 mm (insufficient to fracture at the 15 N to 25 N band separation threshold), forcing line stoppages and requiring statistical process control with bridge thickness sampling at 30-minute intervals across 10 sequential closures per cavity. Impact resistance at low filling temperatures is evaluated by dropping capped and filled bottles conditioned at 4°C from 1.5 m onto concrete; closure fracture occurring before bottle burst signals excessive notched sensitivity due to rapid injection gate freeze-off and residual gate-area morphology, corrected by increasing gate diameter from 0.5 mm to 0.8 mm or raising nozzle temperature by 5°C. The finished articles encompass single-piece injection-molded CSD closures with 28 mm and 38 mm neck diameters, two-piece sports closures with overmolded thermoplastic elastomer push-pull valves (where PP homopolymer forms the rigid threaded base and the TPE valve is injected in a second shot), and compression-molded linerless water closures with bore seals achieving removal torques below 1.8 N·m after 14 days of ambient aging.
Processing polypropylene homopolymer through cast film extrusion at line speeds exceeding 150 m/min for twist-wrap confectionery packaging and tape-backing substrates imposes strict requirements on melt curtain stability and neck-in minimization between the flat die exit and the chill roll nip point. The film, typically produced at thicknesses of 25 μm to 60 μm, must maintain thickness variation below ±4% across the web width per ISO 4593:2023 (2-sigma basis) to prevent downstream converting issues such as transverse-direction tear propagation during high-speed slitting at 600 m/min. While grade PP1065KN's high melt flow rate facilitates low melt pressure drop across coat-hanger manifold dies of 1,200 mm to 2,400 mm width, it also increases the tendency for draw resonance—an oscillatory thickness fluctuation in the air gap between die lip and chill roll—at draw ratios exceeding approximately 8:1 when the melt temperature at the die exit falls below 240°C. Draw resonance amplitude of ±15% of nominal thickness at a frequency of 2 Hz to 5 Hz renders the film unusable for registered printing. The addition of 2 wt% to 5 wt% low-density polyethylene or polyolefin elastomer (ethylene-octene copolymer with density 0.870 g/cm³) to the homopolymer modifies the extensional strain-hardening behavior, suppressing draw resonance onset and allowing stable operation at draw ratios up to 12:1 without thickness oscillation exceeding ±3%. Contact-chill-roll surface finishing with 0.2 μm Ra matte chrome or 0.025 μm Ra super-mirror polished finish determines the film's haze—2% to 4% for mirror-finished versus 15% to 20% for matte-finish rolls on 50 μm film per ASTM D1003-21—and influences downstream metallization adhesion when vacuum-deposited aluminum at optical densities of 2.0 to 2.8 is applied, with metal adhesion measured by EAA-peel tape testing per ASTM D3359-23 Method B requiring 4B or 5B classification. Compliance for food contact cast film includes EU Regulation (EC) No 1935/2004, with overall migration into simulant D1 (50% ethanol, 10 days at 40°C) below 10 mg/dm² per Regulation (EU) No 10/2011. Applications driven by this conversion route include single-ply candy twist-wraps with dead-fold properties characterized by a dead-fold retention angle of ≥50° from horizontal after 30 seconds, adhesive tape backing film with corona-treated surface energy maintained at ≥48 dynes/cm (measured per ASTM D2578-23 using formamide/ethyl cellosolve test fluids) for at least 6 months post-treatment, and laminated snack packaging with print-receptive surface after inline corona treatment at 2.5 kW to 4.0 kW discharge power on webs moving at 120 m/min.
Staple fiber and continuous multifilament yarn spinning from polypropylene homopolymer for needlepunched and thermally bonded geotextile applications requires specific rheological characteristics at the spinneret capillary to achieve target filament tensile properties without excessive fiber breaks at godet roll haul-off speeds ranging from 800 m/min to 2,500 m/min. Fiber-grade formulations for this sector incorporate hindered amine light stabilizer (HALS) packages at 0.3 wt% to 0.8 wt% (commonly poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidyl)imino]] combined with UV absorber 2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol at 0.15 wt% to 0.30 wt%) to satisfy service-life requirements of 25 years in buried soil contact under pH 4 to pH 9 conditions per EN 13252:2016 for geotextiles in drainage and erosion control. The melt flow rate of the base polymer, combined with controlled rheology adjustment via organic peroxide dosing at 300 ppm to 700 ppm of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane introduced via masterbatch at the extruder throat, adjusts the apparent melt viscosity at 1,500 s⁻¹ shear rate (measured at 250°C per ISO 11443:2021) to 25 Pa·s to 35 Pa·s, a range empirically correlated with spinline stability in spinnerets of 0.30 mm capillary diameter and 1,200 m to 2,400 m filament length per position on short-spin lines. Filament tenacity after drawing at draw ratios of 3:1 to 5:1 over heated godet sets at 80°C to 120°C reaches 4.0 cN/dtex to 5.5 cN/dtex with elongation at break values of 30% to 60% measured per ISO 2062:2009 on single filaments at 500 mm gauge length. A persistent processing anomaly at draw ratios exceeding 4.5:1 is the onset of fibrillation—longitudinal splitting of the filament into microfibers—triggered by crystalline orientation in the monoclinic α-phase exceeding 85% crystalline orientation factor as measured by wide-angle X-ray diffraction, which degrades the filament's transverse cohesive strength to below 0.5 cN/dtex and renders it unsuitable for carding operations that apply transverse shear. Spinning beam filtration at 25 μm to 40 μm absolute ratings removes agglomerates that nucleate filament breaks, with acceptable break rates sustained at ≤3 breaks per ton of filament produced over 24-hour continuous operation. Geotextile compliance invokes EN 13252:2016 for separation and filtration functions (retention of soil particles above design opening size O₉₀ while permitting water flow normal to the plane exceeding 50 l/m²/s at 50 mm hydraulic head), EN 13249:2016 for roads and railways with static puncture resistance per EN ISO 12236:2006 exceeding 2.5 kN (CBR test at 50 mm plunger diameter), and EN 13251:2016 for earthworks with tensile strengths per EN ISO 10319:2015 of ≥15 kN/m in both machine and cross directions. Needlepunched staple fiber nonwovens at 300 g/m² to 600 g/m² basis weight processed on needle looms with 4,000 punctures/cm² penetration density exhibit grab tensile strengths of 800 N to 1,200 N per ASTM D4632/D4632M-15a(2023) and trapezoidal tear strengths of 300 N to 500 N per ASTM D4533/D4533M-15(2023). The finished product range spans thermally bonded continuous filament geotextiles for railway ballast separation at 200 g/m² to 400 g/m², needlepunched staple fiber geotextiles for landfill drainage layers, and staple fiber substrates for bituminous waterproofing membranes where polypropylene fiber is added at 2 wt% to 5 wt% into oxidized bitumen compounds to improve low-temperature flexibility and crack bridging at -10°C.
Thick-section extrusion of polypropylene homopolymer sheet for stationery and filing products—including ring-binder covers, report covers, and index dividers—operates at sheet thicknesses of 0.5 mm to 2.0 mm on three-roll polishing stack calenders fed by single-screw extruders with 30D to 36D L/D ratios and barrier-type screws featuring Maddock mixing sections. The high melt flow rate enables sheet throughputs of 400 kg/h to 800 kg/h on 1,500 mm wide polishing stacks without exceeding melt pressure limits of 250 bar before the screen changer. Pigmentation is typically via polypropylene-based masterbatch at 2 wt% to 4 wt% addition level with organic or inorganic pigments selected for lightfastness exceeding Blue Wool Scale 6 after 200 hours Xenon arc exposure per ISO 105-B02:2014. Sheet stiffness at 0.8 mm thickness—flexural modulus values of 1,400 MPa to 1,600 MPa per ISO 178:2019 at 23°C—provides adequate beam strength for free-standing file dividers without creep deformation exceeding 5 mm deflection under 500 g static load applied at the free edge over 1,000 hours at 40°C. A known die-lip buildup phenomenon occurs when processing compounded formulations containing stearate-based acid scavengers at concentrations above 1,000 ppm; calcium stearate volatilizes at die exit temperatures exceeding 230°C, condensing on the lower die lip and creating machine-direction score lines at intervals corresponding to the deposition rate of 0.5 mg/cm²/hr, requiring die-lip cleaning intervals of 4 hours to 8 hours unless replaced by synthetic hydrotalcite acid scavenger at 300 ppm to 500 ppm active level that eliminates volatilization below 280°C. Dielectric properties—a dielectric constant of 2.25 to 2.30 at 1 MHz per IEC 60250:2020 and dissipation factor of 0.0002 to 0.0005—render the sheet suitable for non-conductive stationery where electrostatic print toner adhesion tests require surface resistivity values between 10¹² and 10¹⁴ Ω/square per IEC 62631-3-2:2023 to prevent toner scattering during electrophotographic copying processes. Finished products include extrusion-calendered sheet for hot-foil-stamped binder covers, silk-screen-printed file dividers with punching tolerance of ±0.25 mm on hole spacing to match 80 mm ring mechanisms, and clear front report covers with haze values measured on 1.0 mm sheet below 18%.
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When considering polypropylene grades for thin-wall injection molding applications where cycle-time reduction and stiffness govern part design, ExxonMobil PP Homopolymer PP1065KN occupies a distinct position within the product portfolio. The grade is a nucleated, high-melt-flow homopolymer delivering a melt mass-flow rate (MFR) of 52 g/10 min measured per ISO 1133-1:2022 at 230 °C under 2.16 kg load. Its rapid crystallization kinetics, induced by a sodium benzoate-based nucleating agent, shorten solidification time and permit demolding at higher part temperatures relative to non-nucleated homopolymers of comparable flow. This performance envelope targets multi-cavity, high-speed injection molding of rigid packaging, closures, housewares, and living-hinge components, where dimensional accuracy, low warpage, and consistent part mass are critical to downstream automation and capping torque performance.
Crystallization half-time under quiescent conditions at 135 °C drops from approximately 45 seconds for a non-nucleated homopolymer of equivalent melt viscosity to below 12 seconds for a sodium benzoate-nucleated system, measured by differential scanning calorimetry at an isothermal hold. The resulting spherulite radius typically remains below 20 μm, suppressing light-scattering haze and reducing anisotropic shrinkage differentials between flow and transverse directions to less than 0.2 percentage points. On injection molding machines equipped with 25:1 L/D general-purpose screws and compression ratios of 2.5:1, the reduced supercooling requirement permits mold temperatures as low as 10 °C without excessive undercooling-induced skin-layer retardation, though a set value of 20 °C is recommended to balance flow-front mobility and cycle time. Melt temperatures are maintained in a narrow window of 210–250 °C; excursions above 260 °C risk decomposition of the nucleating agent, forming volatile byproducts that deposit as a white film on cavity surfaces—a failure mode observed as mold fouling on multi-cavity tools operated without regular preventive vent cleaning. The rapid crystallization allows part ejection at 85 °C, versus 65–70 °C typical for non-nucleated homopolymers, directly reducing in-mold cooling time by 20–30% in parts with 1 mm nominal wall thickness. In hot-runner systems, manifold temperature uniformity within ±3 °C is critical; cold spots below 190 °C promote premature solidification in the runner channel, causing gate freeze-off and short shots in outer cavities. Real-time monitoring of fill pressure curves on production lines with 32- or 64-cavity tools reveals that nucleated PP1065KN allows a wider processing window for switch-over to holding pressure—acceptable screw cushion variability remains within 3–5 mm—before flashing or sink-mark defects appear.
Shear-thinning behavior in PP1065KN follows a power-law index significantly below unity at deformation rates exceeding 100 s⁻¹, reducing effective viscosity and enabling stable filling of parts with nominal wall thickness down to 0.4 mm. Published data for this specific grade configuration is limited; however, observations from capillary rheometry on nucleated high-flow homopolymers with MFR in the 50 g/10 min range indicate that a Carreau-WLF model parameterization at 230 °C yields a zero-shear viscosity near 120 Pa·s and a critical shear rate for shear thinning onset of approximately 5 s⁻¹. At 10 000 s⁻¹—representative of thin-wall gate shear rates—dynamic viscosity approaches 25 Pa·s. This rheological fingerprint avoids premature flow-front stagnation in channels thinner than 0.5 mm, provided the mold temperature stays above 15 °C. Batch-to-batch MFR tolerance is controlled within ±4 g/10 min on production-scale compounding lines with continuous melt-index monitoring. Processors incorporating hygroscopic colorants or filler masterbatches should pre-dry the compound at 80 °C for 2–3 hours despite the inherent hydrolytic stability of the base resin; absorbed moisture in additive carriers generates splay and voids at high melt temperatures.
Typical values below derive from injection-molded specimens conditioned according to ISO 291:2008 at 23 °C and 50% relative humidity. The grade is classified under ISO 19069-1 as a polypropylene homopolymer and meets FDA 21 CFR 177.1520(c) item 1.1a for food contact, EU Regulation 10/2011, REACH (EC 1907/2006), and RoHS 2011/65/EU requirements for heavy metals and restricted substances.
| Property | Test Method | Typical Value | Unit |
|---|---|---|---|
| Melt Mass-Flow Rate (230 °C/2.16 kg) | ISO 1133-1:2022 | 52 | g/10 min |
| Density | ISO 1183-1:2019 | 0.905 | g/cm³ |
| Tensile Stress at Yield (50 mm/min) | ISO 527-2:2012 | 34 | MPa |
| Tensile Strain at Yield | ISO 527-2:2012 | 8 | % |
| Flexural Modulus (2 mm/min) | ISO 178:2019 | 1600 | MPa |
| Charpy Notched Impact Strength, 23 °C | ISO 179-1/1eA:2010 | 2.5 | kJ/m² |
| Charpy Notched Impact Strength, 0 °C | ISO 179-1/1eA:2010 | 1.5 | kJ/m² |
| Heat Deflection Temperature (HDT/B, 0.45 MPa) | ISO 75-2:2013 Method B | 97 | °C |
| Vicat Softening Temperature (A50, 10 N) | ISO 306:2022 | 155 | °C |
| Shore D Hardness (15 s) | ISO 868:2003 | 72 | — |
| Rockwell Hardness, R-Scale | ISO 2039-2:1987 | 95 | — |
| Mold Shrinkage (parallel, typical) | ISO 294-4:2018 | 1.3 | % |
PP1065KN is selected over impact copolymers where long-term creep resistance and part rigidity govern functional retention, such as in tamper-evident screw caps, overcaps, and integrated living-hinge closures. Homopolymer grades of this class typically exhibit a creep modulus above 800 MPa at 1 000 h under 10 MPa tensile load per ISO 899-1, values that are 30–50% higher than those of comparable-MFR heterophasic copolymers containing ethylene-propylene rubber domains. This translates into lower thread relaxation and more consistent opening torque over shelf life. However, the absence of a dispersed rubber phase imposes a minimum service temperature of approximately −10 °C for clip-fit or snap-fit features subjected to impact loading; drop-test failures on freezer-grade packaging are observed when Charpy notched values fall below 2.0 kJ/m² at the application temperature.
| Grade | MFR (230 °C/2.16 kg) | Flexural Modulus | Charpy Notched 23 °C | HDT/B | Architecture |
|---|---|---|---|---|---|
| PP1065KN | 52 g/10 min (ISO 1133-1) | 1600 MPa (ISO 178) | 2.5 kJ/m² (ISO 179-1/1eA) | 97 °C | Nucleated homopolymer |
| PP1012 | 1.2 g/10 min (ISO 1133-1) | 1550 MPa (ISO 178) | 4.0 kJ/m² (ISO 179-1/1eA) | 95 °C | Non-nucleated homopolymer |
| PP7032E2 | 4.0 g/10 min (ISO 1133-1) | 1100 MPa (ISO 178) | 15 kJ/m² (ISO 179-1/1eA) | 75 °C | Impact copolymer |
The high MFR of PP1065KN enables injection pressures 20–30% lower than those required by PP1012 in thin-wall spiral-flow tooling, as demonstrated on 800 kN clamp-force machines with hydraulic accumulators capable of 400 mm/s injection speed. In closure tooling with 48 cavities and hot-drop gating, this translates to consistent filling at a peak hydraulic pressure of 85–100 bar, compared with 120–140 bar for a 12 g/10 min homopolymer. The nucleating agent further mitigates post-molding dimensional change by promoting a more uniform crystalline morphology across weld-line regions, reducing out-of-roundness in threaded caps to below 0.15 mm on 28 mm finish diameters. Incompatibility arises when color masterbatches containing amine-based stabilizers are introduced; the amine functionality can react with the sodium benzoate nucleator, partially degrading nucleation efficiency and causing erratic shrinkage. It is recommended to use masterbatches whose carrier and stabilizer chemistry have been validated via isothermal crystallization half-time measurements before production lot approval.
On production-scale injection molding machines equipped with accumulator-assisted high-speed injection, the recommended start-up melt temperature is 230 °C, with back pressure limited to 5–10 bar to prevent excessive shear heating that can degrade the nucleating agent. Plastication residence time must not exceed 8 minutes; when interruptions are expected, barrel temperatures should be reduced to 180 °C or purging with a low-MFR polypropylene should be performed. Observation of mold deposit formation—a white powdery residue composed primarily of sodium benzoate decomposition products—indicates local hot spots above 270 °C or trapped dead spots in hot-runner manifolds. Mitigation requires thermocouple verification at each nozzle tip and, where necessary, replacement of steel hot-runner blocks with beryllium-copper inserts to improve thermal uniformity. Insufficient mold venting induces diesel effects and burn streaks, as the rapid injection velocities (300 mm/s) trap air; vent depths should be maintained at 0.015–0.025 mm for polypropylene, with full-perimeter venting on parting lines whenever surface appearance allows. Processors operating in environments with relative humidity above 60% should incorporate a dehumidified hopper or pre-dry the resin, as surface moisture on cold pellets introduced to the feed throat can hydrolyze the nucleating agent, reducing its effectiveness and shifting the MFR by up to 3 g/10 min. The material is not recommended for applications requiring continuous exposure to hot water above 80 °C without reinforcement, as the homopolymer matrix undergoes oxidative chain scission accelerated by nucleator residues, progressively embrittling parts after 1 000–2 000 hours of immersion.
