| HS Code | 336355 |
| Melt Flow Rate | 2.5 g/10min (230°C, 2.16kg) |
| Density | 0.905 g/cm³ |
| Tensile Strength At Yield | 34 MPa |
| Elongation At Yield | 10% |
| Flexural Modulus | 1350 MPa |
| Izod Impact Notched 23 C | 5 kJ/m² |
| Vicat Softening Temperature A50 | 152 °C |
| Heat Deflection Temperature 0 45 Mpa | 95 °C |
| Melting Temperature | 165 °C |
| Rockwell Hardness | R 100 |
As an accredited MARPOL PP Homopolymer VHE 54065 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARPOL PP Homopolymer VHE 54065 is supplied in 25 kg sealed polypropylene bags, palletized and wrapped for safe transport. |
| Container Loading (20′ FCL) | Load 20′ FCL of MARPOL PP Homopolymer VHE 54065 securely, keeping bags dry, clean, and protected from damage during transit. |
| Shipping | Polypropylene homopolymer (VHE 54065) is a non-hazardous, non-MARPOL-regulated resin. Ship in clean, dry bags or containers, protected from moisture and excessive heat. No IMDG/ADR dangerous goods classification required. Handle gently to avoid bag damage and keep away from ignition sources. Standard dry-cargo shipping is suitable. |
| Storage | Store MARPOL PP Homopolymer VHE 54065 in a cool, dry, well-ventilated area, away from direct sunlight, ignition sources, and strong oxidizers. Keep containers tightly sealed to prevent moisture pickup and contamination. Avoid prolonged high temperatures to preserve material properties. Protect packaging from physical damage and store upright. Ensure good housekeeping and appropriate handling procedures. |
| Shelf Life | Shelf life is 2 years from manufacture when stored in original, unopened packaging under dry, moderate conditions. |
Injection molding of thin-wall rigid packaging from MARPOL PP Homopolymer VHE 54065 is specified where high flow length-to-wall-thickness ratios demand low melt viscosity without sacrificing top load performance. The resin is compounded at 96–99.5 wt% neat loading; nucleating agent is added at 0.05–0.25 wt%, acid scavenger at 0.02–0.10 wt%, and colour masterbatch at 0.5–4.0 wt%. Closures and caps intended for low-torque release typically incorporate slip/antiblock masterbatch at 0.1–0.3 wt%. Compliance for food-contact packaging is evaluated under FDA 21 CFR 177.1520 olefin polymer provisions and EU No 10/2011, with overall migration testing per EN 1186-1 and specific migration testing per EN 13130-1. REACH SVHC screening and RoHS 2011/65/EU Annex II restrictions apply for electrical or electronic articles. Processing on production-scale injection molding machines with clamp force from 0.4 to 0.8 ton/cm² of projected area is typical; barrel temperature profiles range from 220°C at the feed throat to 250°C at the nozzle, mold temperature is held at 20–60°C, injection pressure is set between 70 MPa and 120 MPa, and hold pressure is maintained at 50–80% of the injection pressure. Screw geometry uses an L/D ratio of 20:1–24:1 and a compression ratio of 2.5:1–3.5:1. Warpage on thin-wall containers is controlled through uniform cooling circuits and hold-pressure profiling; published data for this specific grade is limited, so mechanical acceptance values should be verified against the supplier certificate of analysis using ISO 527-2 tensile testing and ISO 178 flexural testing. Terminal finished product types include dairy cups, delicatessen containers, caps and closures, cutlery, housewares, and non-food rigid packaging components.
On production-scale injection molding lines, the principal failure modes are sink marks opposite bosses, warpage from differential shrinkage, and brittleness when mold temperature is held below 20°C. Batch-to-batch variance in melt mass-flow rate measured according to ISO 1133-1:2022 at 230°C and 2.16 kg should be monitored because a shift of ±2 g/10 min relative to the certificate of analysis changes fill pressure by approximately 5–10 MPa on thin-wall molds. Multi-cavity tools with hot-runner systems require uniform melt delivery; imbalance above ±5% of cavity fill weight creates inconsistent wall thickness and reduced top load. For food-contact articles, organoleptic panel testing is performed under EN 1230-2 and surface sensorial contamination is assessed using EN 1186-14 where applicable. Screw recovery time is optimized by back pressure settings between 0.5 MPa and 1.5 MPa; excessive back pressure raises melt temperature and can initiate molecular weight degradation, detected as a drop in melt viscosity or an increase in plate-out on the mold surface.
In biaxially oriented polypropylene film production, the core layer is formulated from homopolymer PP because high isotacticity provides the crystalline morphology necessary for sequential stretching at elevated draw ratios. MARPOL PP Homopolymer VHE 54065 is used at 95–100 wt% in the core layer; coextruded skin layers may contain slip/antiblock masterbatch at 0.10–0.30 wt% and antistatic agent at 0.05–0.15 wt%, while the core retains minimal migratory additives. Film compliance is assessed under FDA 21 CFR 177.1520, EU No 10/2011, and German BfR Recommendation VI where applicable. Mechanical properties are determined by ISO 527-3 and ASTM D882; haze and clarity are measured with ASTM D1003 and ISO 14782. Process conditions on tenter-frame lines require cast roll temperature between 20°C and 35°C to control spherulite size; MD stretching is performed at 4.5:1–5.5:1 and TD stretching at 8:1–10:1 in ovens heated to 165–175°C. Line speeds of 250–500 m/min are common. Edge trimming losses and die-lip deposit are the main processing failure modes when the cast sheet temperature deviates below 15°C or when the melt temperature exceeds 260°C. Terminal film types include snack-food overwrap, clear lamination film, adhesive tape base film, labels, and floral wrap.
On high-speed tenter lines, the main process conflict is balancing cast roll temperature with line speed: if quench temperature falls below 15°C, edge trim generates brittle flakes that contaminate the tenter; if quench temperature exceeds 35°C, the sheet preheats unevenly and transverse stretching produces thickness bands visible as ≥2% haze increase under ASTM D1003. Die-lip deposit from oligomeric species is controlled by purge intervals and by limiting melt residence time at temperatures above 260°C to less than 10 minutes. Tensile modulus and elongation at break of the finished film are measured under ISO 527-3; typical acceptance ranges for homopolymer PP BOPP film are 1,800–2,500 MPa in the MD and 2,200–3,000 MPa in the TD, but buyer specifications should refer to the certificate of analysis. Terminal film grades include heat-sealable coextruded film where the core remains homopolymer and the skins are a propylene-ethylene copolymer, low-sealing-initiation-temperature packaging, twist-wrap film, and label facestock.
Raffia tape extrusion from MARPOL PP Homopolymer VHE 54065 is carried out on slit-film lines where the extruded flat tape is quenched in a water bath at 30–45°C, slit into tapes, and hot-air oriented at draw ratios between 5:1 and 8:1. The compound loading is 90–99.7 wt% resin with calcium carbonate filler at 0–10 wt%, UV stabilizer at 0.2–0.8 wt%, and pigment masterbatch at 1–3 wt%. Industrial standards include ISO 527-3 for tape tensile properties, ISO 4892-2 for accelerated weathering, and ISO 21898:2004 for flexible intermediate bulk containers where the woven fabric is converted into FIBC. EN 277:1995 applies to woven polypropylene sacks for food contact. Fibrillation occurs when draw ratio exceeds 7:1 while cooling air velocity drops below 2 m/s; tape denier variation from 800 to 1,200 denier is controlled by adjusting extruder speed and hot-air oven temperature between 120°C and 160°C. Terminal finished products include woven sacks for cement and fertilizer, FIBC bulk bags, baler twine, rope, carpet backing, and flexible packaging fabric.
Production-line failure modes on raffia tape lines include tape fibrillation, uneven linear density, and draw resonance. Fibrillation is induced when the draw ratio exceeds 7:1 while the water bath temperature is below 30°C; a cooling air velocity below 2 m/s after the oven increases tape width variation. Tape tensile tenacity is measured under ISO 527-3 or ASTM D2256; accepted tenacity values for woven-sack tape typically fall between 0.30 N/tex and 0.55 N/tex, depending on draw ratio. Weaving on circular looms requires tape width and thickness tolerances of ±10% to prevent fabric skewing. For FIBC production, fabric construction is tested under ISO 21898:2004, including cyclic top-lift testing at five times the safe working load; coating with a lamination layer may add 5–15 g/m² of low-melting LDPE or PP-based coating. Terminal finished goods include cement sacks with 50 kg and 25 kg formats, fertilizer bags, sandbags, geotextile tubes, agricultural twine, and FIBCs rated from 500 kg to 2,000 kg.
| Processing scenario | Resin loading | Typical additive addition ratios | Primary mechanical/processing test standard |
|---|---|---|---|
| Injection molding of thin-wall rigid packaging | 96–99.5 wt% | Nucleating 0.05–0.25 wt%, acid scavenger 0.02–0.10 wt%, colour 0.5–4.0 wt% | ISO 527-2, ISO 1133-1:2022 |
| BOPP film core layer | 95–100 wt% | Slip/antiblock 0.10–0.30 wt%, antistatic 0.05–0.15 wt% | ISO 527-3, ASTM D882, ASTM D1003 |
| Raffia tape extrusion | 90–99.7 wt% | CaCO3 0–10 wt%, UV stabilizer 0.2–0.8 wt%, pigment 1–3 wt% | ISO 527-3, ISO 4892-2 |
| Spunbond nonwoven fabric | 97–99.5 wt% | Processing stabilizer 0.05–0.20 wt%, hydrophobic 0.2–0.6 wt%, pigment 0.5–3.0 wt% | ISO 9073-2, ISO 10993-5 |
| Plug-assisted thermoforming | 99.5–100 wt% | Nucleating 0.05–0.2 wt%, antistatic 0.1–0.3 wt% | ISO 527-2, ISO 6603-2 |
| Coextruded rigid sheet | 60–95 wt% core | Talc 5–40 wt%, stabilizer 0.05–0.2 wt%, pigment 1–3 wt% | ISO 178, ISO 75-2 |
Spunbond nonwoven fabric production using MARPOL PP Homopolymer VHE 54065 requires melt spinning through spinnerets with hole diameters from 0.3 mm to 0.6 mm at melt temperatures between 230°C and 260°C. The formulation is 97–99.5 wt% homopolymer PP, with processing stabilizer at 0.05–0.20 wt%, hydrophobic additive at 0.2–0.6 wt%, and pigment masterbatch at 0.5–3.0 wt%. Fibre attenuation uses high-velocity air drawing at 3,000–6,000 m/min, followed by thermal calender bonding at roll temperatures from 140°C to 160°C and bond area between 15% and 25%. Industry compliance standards include ISO 9073-2 for fabric tensile properties, ISO 10993-5 and ISO 10993-10 for medical-grade cytotoxicity and skin irritation, and Oeko-Tex Standard 100 Annex 4 Class I for hygiene articles. The main process failure mode is filament breakage caused by melt inhomogeneity or by calender temperature drifting above 165°C, which produces glazed burn marks. Terminal finished product types include diaper topsheet, medical gown fabric, face-mask intermediate layers, agricultural crop cover, furniture backing fabric, and geotextile.
Production-scale spunbond lines using homopolymer PP experience filament breaks at the spinneret face when melt filtration is below 200 mesh or when melt temperature drifts above 260°C. Calender bonding is a critical threshold zone: roll temperature below 140°C produces weak bond points and fabric tensile strength drops below acceptable limits under ISO 9073-2, while roll temperature above 165°C creates glazed, brittle fabric with reduced air permeability. Medical and hygiene applications require heavy-metal and formaldehyde residues controlled according to Oeko-Tex Standard 100 Annex 4 Class I; cytotoxicity is evaluated under ISO 10993-5 and skin irritation under ISO 10993-10. The finished fabric basis weight can range from 10 g/m² to 150 g/m²; light basis weights below 12 g/m² are highly sensitive to winding tension and may exhibit blocking during storage if antistatic additive levels fall below 0.2 wt%.
Thermoforming of homopolymer PP sheet based on MARPOL PP Homopolymer VHE 54065 is specified for semi-rigid packaging that must avoid styrenic resin but still meet stacking strength and puncture resistance. The sheet formulation is 100 wt% homopolymer PP or 99.5–99.9 wt% with nucleating agent at 0.05–0.2 wt% and antistatic masterbatch at 0.1–0.3 wt%. Film/sheet compliance is evaluated under FDA 21 CFR 177.1520 and EU No 10/2011, with mechanical acceptance using ISO 527-2, ISO 178, and puncture resistance per ISO 6603-2. Sheet extrusion is performed at melt temperatures of 220–250°C, with a vertical three-roll polish stack held at 60–90°C to produce sheet thickness from 0.3 mm to 2.0 mm. The forming stage uses plug-assisted pressure forming with sheet surface temperature between 180°C and 210°C, mold temperature from 40°C to 70°C, and forming pressure of 4–7 bar. Process conflict arises from the narrow sag window of homopolymer PP: below 175°C the sheet resists drawing, while above 210°C melt strength decreases and corner thinning becomes unacceptable. Terminal finished products include deli trays, bakery inserts, disposable cups, lids, medical device trays, and reusable industrial dunnage.
Sheet extrusion for thermoforming from homopolymer PP presents a narrow processing window because the resin has lower melt strength than random copolymer PP. On industrial lines, sheet surface temperature mapping with infrared pyrometers is used to maintain a variation of less than ±3°C across the forming area. If the sheet center remains below 175°C, plug assist pressure increases above 7 bar and causes mold spring; if the sheet exceeds 210°C, sag depth exceeds 15 mm and wall thickness at the corner falls below 0.25 mm. A nucleated formulation at 0.10–0.20 wt% nucleating agent reduces haze and shortens cycle time by increasing crystallization temperature, but at the expense of a narrower forming window. Compliance for frozen-food trays and microwaveable packaging includes EU No 10/2011 migration testing and FDA 21 CFR 177.1520; puncture resistance of formed parts is compared using ISO 6603-2 at impact speed of 4.4 m/s. Terminal finished products include freezer-to-microwave trays, fruit punnets, bakery inserts, meal trays, disposable drink cups, and reusable logistics trays.
| Application segment | Primary regulatory/citation basis | Relevant test method or clause |
|---|---|---|
| Injection-molded food packaging | FDA 21 CFR 177.1520, EU No 10/2011 | EN 1186-1, EN 13130-1, ISO 527-2 |
| BOPP film | FDA 21 CFR 177.1520, EU No 10/2011, BfR Recommendation VI | ASTM D882, ASTM D1003, ISO 14782 |
| Woven sacks and FIBC | EN 277:1995, ISO 21898:2004, ISO 4892-2 | ISO 527-3, ASTM D2256 |
| Spunbond nonwoven | ISO 9073-2, ISO 10993-5, ISO 10993-10, Oeko-Tex Standard 100 | Annex 4 Class I, ISO 10993-5 |
| Thermoformed semi-rigid packaging | FDA 21 CFR 177.1520, EU No 10/2011 | ISO 6603-2, ISO 75-2 |
| Coextruded rigid sheet | FDA 21 CFR 177.1520, EU No 10/2011, ISO 179-1 | ISO 178, ISO 75-2, EN 1186-1 |
Rigid sheet extrusion from MARPOL PP Homopolymer VHE 54065 is run on coextruded lines where the homopolymer resin is assigned to the core layer and a lower-melting copolymer or a filled PP compound is assigned to the skin layers. The core layer typically contains 60–95 wt% homopolymer PP, talc filler at 5–40 wt% where higher modulus is required, stabilizer masterbatch at 0.05–0.2 wt%, and pigment at 1–3 wt%. Compliance standards include ISO 527-2, ISO 178, ISO 75-2 for heat deflection temperature, and ISO 179-1 for Charpy impact; food-contact grades require FDA 21 CFR 177.1520 and EU No 10/2011. Production uses a co-rotating twin-screw extruder with L/D ratio of 36:1–44:1, side-feeder for mineral filler, melt temperature of 200–240°C, and a flat die feeding a calender stack at 60–100°C. Terminal finished product types include stationery folders, ring-binder covers, packaging inserts, reusable containers, and protective sheets for industrial material handling.
Multi-layer sheet lines using MARPOL PP Homopolymer VHE 54065 in the core layer typically employ a feedblock or multi-manifold die to maintain layer distribution within ±5% of target thickness. Calender stack variables determine sheet gloss and residual stress: roll temperatures below 60°C can freeze surface orientation and cause dimensional instability during later die-cutting, while roll temperatures above 100°C can cause sticking and transfer marks. Talc-filled core layers at 20–40 wt% raise flexural modulus under ISO 178 to values above 2,000 MPa but reduce Charpy impact strength under ISO 179-1; unfilled homopolymer PP sheet remains preferable for stationery where fold-crack resistance is critical. The finished sheet is converted by die-cutting, creasing, and ultrasonic welding; food-contact grades must meet FDA 21 CFR 177.1520 and EU No 10/2011 with overall migration under EN 1186-1 below 10 mg/dm². Terminal finished products include report covers, ring-binder panels, folding boxes, reusable restaurant containers, and clean-room packaging dividers.
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MARPOL PP Homopolymer VHE 54065 is designated as an unmodified polypropylene homopolymer. The grade code VHE 54065 follows the supplier’s internal nomenclature and carries no normative melt-flow or additive translation under ISO 19069-1. The model descriptor is supplied as a homopolymer without deliberate ethylene comonomer insertion. Because the certificate of analysis for this configuration is not reproduced here, the following description separates class-level behaviour of isotactic polypropylene homopolymers from grade-specific release limits that must be confirmed against the current manufacturer’s technical data sheet.
Incoming quality control should compare lot certificates against the specification sheet for melt mass-flow rate, tensile yield stress, flexural modulus, and ash level. The exact numerical specification window for VHE 54065 is not reproduced here because published data for this configuration is limited; end users should request the version-controlled technical data sheet and lot certificate under ISO 9001:2015.
Polypropylene homopolymers such as VHE 54065 are classified under ISO 19069-1 as propylene polymers with no intentional ethylene or other α-olefin comonomer addition. The microstructure is predominantly isotactic, and the crystalline phase fraction develops according to cooling rate and nucleation density. In contrast, random polypropylene copolymers contain a low ethylene fraction, often in the range of 1.5 wt% to 3.5 wt%, which breaks isotactic sequence length, reduces crystallinity, and lowers flexural modulus when measured under ISO 178. Impact copolymers consist of a continuous polypropylene matrix and a dispersed ethylene-propylene rubber phase; the dispersed phase increases impact crack propagation resistance, particularly at temperatures below 0 °C, but reduces stiffness.
The main commercial difference between VHE 54065 and a random copolymer of comparable melt flow is the higher stiffness and higher heat deflection temperature of the homopolymer. Flexural modulus determined under ISO 178 is typically higher for homopolymer grades, while notched Charpy impact at −20 °C under ISO 179-1/1eA is lower. The difference is most pronounced in slow-cooled, thick sections where crystallinity is maximised; in fast-cooled thin-wall sections, the stiffness advantage may narrow. Compared with impact copolymers, VHE 54065 lacks the elastomeric dispersed phase and should be expected to show lower resistance to crack initiation under multiaxial impact (ISO 6603-2) and lower low-temperature Charpy values.
Melt flow rate is the principal specification that controls grade substitution. For VHE 54065, the melt mass-flow rate should be determined under ISO 1133-1:2022 using a 2.16 kg load at 230 °C. The supplier’s release limits and the actual certificate of analysis number should be obtained before tool transfer. If the grade is positioned as a high-flow homopolymer, users may observe the practical consequences of high MFR as reduced injection pressure, faster cavity filling, and a narrower temperature window before flashing; however, published data for this specific configuration is limited.
Polypropylene homopolymers are not significantly hygroscopic, but surface moisture can produce splay and internal voids when resin is stored at relative humidity above 60 % RH. A desiccant dryer with a dew point below −30 °C and an air temperature of 80 °C for 2 h to 4 h is a common precaution when surface moisture is suspected. Drying time should not exceed the supplier’s maximum thermal exposure recommendation because prolonged hot-air exposure can cause additive migration and yellowing.
On a production-scale injection moulding machine, class-typical barrel set-points for polypropylene homopolymer are 200 °C at the rear zone, 220 °C to 240 °C in the centre and front zones, and 230 °C to 250 °C at the nozzle. Mould surface temperature is commonly maintained between 20 °C and 60 °C; lower values shorten cycle time, while higher values improve weld-line strength and surface replication. These ranges are class-typical and must not override the supplier’s processing recommendations.
Thermal oxidative degradation is the critical process risk above 260 °C. At melt temperatures exceeding 260 °C or residence times above 5 min at 240 °C, chain scission can shift the melt mass-flow rate beyond the supplier’s lot-to-lot variation and reduce tensile yield stress determined under ISO 527-2. The degradation pathway follows free-radical chain scission and consumes the phenolic/phosphite stabiliser package; the nozzle melt temperature should be measured with an immersion thermocouple at start-up and after any barrel residence interruption.
For thin-wall injection moulding, a screw with a diameter of 30 mm to 40 mm is often used on a 1000 kN to 2500 kN clamping unit. The cavity pressure in thin-wall PP homopolymer moulding commonly reaches 300 bar to 500 bar (30 MPa to 50 MPa). Required clamp force is calculated by multiplying projected cavity area by the peak cavity pressure and applying a safety factor of 1.2 to 1.5. Insufficient clamp force produces flash at the parting line and inconsistent shot weight.
Hot-runner tip temperatures for high-flow PP homopolymers are usually set between 230 °C and 260 °C. For gate diameters of 0.5 mm to 1.0 mm, tip temperatures below 230 °C can increase gate freeze time and cause cold slugs; above 260 °C can cause local resin degradation, gate blush, and discolouration. The gate freeze time should be established by short-shot studies or cavity pressure curve analysis.
Compared with lower-flow homopolymer grades of the same producer, a high-flow VHE 54065 would be expected to fill thinner sections with lower injection pressure, but may exhibit slightly lower notched Charpy impact due to lower molecular weight. The exact trade-off depends on the producer’s reactor technology and whether controlled rheology modification has been used. If VHE 54065 is a controlled-rheology grade, the molecular weight distribution may be narrower than that of reactor grades with the same MFR. Narrower distribution generally reduces die swell in extrusion and improves dimensional stability in injection moulding, but may reduce melt strength in thermoforming.
If VHE 54065 is used as a base resin for masterbatch dilution or regrind blending, a co-rotating twin-screw extruder with an L/D ratio of 40:1 to 44:1 and distributive mixing elements is commonly employed. The melt temperature at the die plate is typically held between 210 °C and 240 °C. Multiple passes through the extruder should be avoided because each pass consumes part of the stabiliser package; regrind content in final parts is often limited to 20 % to 30 % of the shot weight. The exact regrind tolerance for VHE 54065 should be established by MFR retention testing under ISO 1133-1 after controlled reprocessing.
Thermal analysis of a polypropylene homopolymer under ISO 11357-3 typically shows a melting peak between 160 °C and 170 °C and a crystallisation peak between 110 °C and 125 °C at a cooling rate of 10 K/min. Nucleation modifies the crystallisation peak upward but does not materially change the melting peak. Oxidation induction time under ISO 11357-6 at 200 °C is used to confirm that the stabiliser package remains active after processing; values below 20 min may indicate degradation or insufficient stabiliser carryover. These class-level thermal boundaries are useful for VHE 54065 only when the supplier’s additive package is known.
Thin-wall packaging and rigid containers with nominal wall thickness below 1.0 mm are common application spaces for high-flow PP homopolymer grades. In this processing regime, the operating conflict is between melt fluidity and solidification rate. The flow front can freeze prematurely when the injection speed is too low or the mould is too cold. An apparent shear rate above 10 000 s⁻¹ may be encountered at the gate; under these conditions, viscosity curves generated by capillary rheometry under ISO 11443 at 230 °C are more representative than low-shear MFR data.
Mould shrinkage for polypropylene homopolymer is anisotropic and is influenced by wall thickness, melt temperature, holding pressure, gate design, and cooling time. Typical industrial values for PP homopolymer injection moulding fall in the range of 1.0 % to 2.0 %, but the exact value for VHE 54065 must be determined using a mould with controlled dimensions under ISO 294-4. Holding pressure is typically applied until the gate freezes; premature release of holding pressure produces sink marks in thicker ribs and bosses.
Published spiral flow length data for VHE 54065 is limited. Instead of using generic spiral flow values, processors should run a flow length test in the production tool at the intended wall thickness and melt temperature. Short-shot trials should be performed with the unit set to produce 95 % of the full shot; the resulting flow-front morphology reveals gate frost, jetting, and unbalanced runner filling.
Cycle time is governed by cooling time for wall sections above 2 mm, but for wall sections below 1.0 mm the limiting step can be melt preparation and part ejection. The cooling time scales with the square of the wall thickness and the thermal diffusivity of the polymer; for polypropylene homopolymer, a class-typical thermal diffusivity is on the order of 1.0 × 10⁻⁷ m²/s to 1.3 × 10⁻⁷ m²/s. Demoulding is assisted by the small degree of shrinkage that occurs during cooling; premature ejection at high residual heat increases warpage in thin-wall panels.
Compliance for VHE 54065 must be assessed in the final article rather than as resin alone. Polypropylene homopolymers used in food-contact applications in the United States may be evaluated under FDA 21 CFR 177.1520; the specific conditions of use, such as temperature and food type, determine the permitted end-use. In the European Union, Regulation (EU) No 10/2011 applies, with an overall migration limit of 10 mg/dm² for food contact and 60 mg/kg for infant foods using the appropriate simulants. Under REACH Regulation (EC) No 1907/2006, the grade must be covered by a registration dossier and any substances of very high concern present above 0.1 % w/w must be declared. The RoHS Directive 2011/65/EU restricts lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE in homogeneous materials for electrical and electronic equipment; a commodity polypropylene homopolymer does not intentionally contain these substances, but final component testing is required.
| Reference | Scope | Application Condition |
|---|---|---|
| FDA 21 CFR 177.1520 | Olefin polymers permitted for food contact | Final article extraction testing under conditions of use; United States market |
| Regulation (EU) No 10/2011 | Plastic materials in food contact | Overall migration limit 10 mg/dm²; 60 mg/kg for infant foods; food simulant testing |
| REACH (EC) No 1907/2006 | Registration, evaluation, authorisation and restriction of chemicals | Registration dossier required; SVHC declaration above 0.1 % w/w |
| RoHS 2011/65/EU | Restriction of hazardous substances in electrical and electronic equipment | Homogeneous material testing for Pb, Hg, Cd, Cr(VI), PBB, PBDE |
| ISO 19069-1/ISO 19069-2 | Polypropylene moulding and extrusion materials designation and preparation | Specimen preparation and conditioning before property determination |
| Property | Test Method | Homopolymer VHE 54065 Class | Random Copolymer | Impact Copolymer |
|---|---|---|---|---|
| Flexural modulus | ISO 178 | Higher | Lower | Lower |
| Notched Charpy at −20 °C | ISO 179-1/1eA | Lower | Moderate | Higher |
| Heat deflection temperature | ISO 75-2/B | Higher | Lower | Lower |
| Optical haze, 1 mm plaque | ASTM D1003 | Higher | Lower | Higher |
| Low-temperature crack propagation resistance | ISO 6603-2 | Lower | Moderate | Higher |
In caps and closures, the combination of high flow and homopolymer stiffness can support down-gauging and faster cycle times. The critical failure modes are stress cracking from aggressive contents and torque decay over time. Resistance to environmental stress cracking should be evaluated under ISO 22088-2 or ASTM D1693, using the actual contact liquid rather than a generic surfactant. Published data for MARPOL PP Homopolymer VHE 54065 in closure geometries is limited; qualification should include full-thread engagement tests at 45 °C to 60 °C for the intended shelf life.
In living hinge applications, polypropylene homopolymer is commonly selected because of its ability to undergo repeated flexing without fracture. Hinge performance is evaluated by repeated flexing through 180° at a controlled rate. A minimum of 10 000 cycles is often used as an internal acceptance criterion for unfilled PP homopolymer, but the exact value for VHE 54065 must be generated on the production tool. Orientation across the hinge line affects fatigue life; the hinge should be flexed at least twice immediately after demoulding to orient the polymer chains before cooling below the crystallisation temperature.
