| HS Code | 473295 |
| Melt Flow Rate 230 C 2 16 Kg | 2.8 g/10 min |
| Density | 0.9 g/cm³ |
| Tensile Strength At Yield | 35 MPa |
| Elongation At Break | 10% |
| Flexural Modulus | 1400 MPa |
| Izod Impact Notched 23 C | 3.2 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 100°C |
| Vicat Softening Point A50 | 150°C |
| Melting Point | 162°C |
| Rockwell Hardness | R100 |
| Water Absorption | 0.01% |
As an accredited ExxonMobil PP Homopolymer PP1572 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ExxonMobil PP Homopolymer PP1572 is supplied as free-flowing pellets in 25 kg bags, packed on pallets for transport. |
| Container Loading (20′ FCL) | Load 20′ FCL with ExxonMobil PP Homopolymer PP1572, securing palletized bags properly to prevent shifting and damage during transit. |
| Shipping | ExxonMobil PP Homopolymer PP1572 is shipped as free-flowing pellets in 25 kg bags, octabins, or bulk hopper trucks. Keep dry, away from ignition sources and excessive heat. Non-hazardous under normal transport conditions; use clean, ventilated equipment. Avoid prolonged UV exposure to prevent degradation. Store indoors with proper containment. |
| Storage | Store ExxonMobil PP Homopolymer PP1572 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture contamination and dust buildup. Avoid prolonged storage at high temperatures; maintain indoor conditions to preserve resin quality. Handle with care to avoid bag damage and ensure proper turnover of stock. |
| Shelf Life | Shelf life is indefinite when stored in original, unopened packaging away from heat, moisture, and direct sunlight. |
On sequential tenter-frame BOPP lines, PP1572 is extruded at 240–260 °C melt temperature through a coat-hanger die onto a polished chill roll held at 30–40 °C, requiring control of the α-crystal nucleation front during the reheating step prior to machine-direction orientation. The cast sheet is typically 180–250 µm thick and enters the MDO section at 115–135 °C; differential speed rolls apply a draw ratio of 4.5–5.5 before the tenter frame stretches the web transversely at 8.0–10.0 and oven temperatures of 160–175 °C. Annealing at 140–150 °C is followed by corona treatment on the sealant side to 38–42 mN/m measured by ISO 8296:2003. In monolayer formulations, PP1572 is used at 100 parts by weight, with a phenolic/phosphite antioxidant masterbatch at 0.05–0.15 wt%, a silica/polymethylsilsesquioxane antiblock masterbatch at 0.10–0.30 wt%, and an erucamide-based slip masterbatch at 0.15–0.25 wt% when a kinetic coefficient of friction below 0.40 is required under ASTM D1894-14. For cavitated opaque film, an additional 3.0–8.0 wt% calcium carbonate masterbatch is used and the MDO draw ratio is reduced to 4.0–4.5 to avoid premature cavitation rupture. Die lip build-up and edge bead oxidation require continuous die purge and trimmed edge reprocessing at no more than 10 wt% of total throughput; residual moisture in CaCO3 masterbatch above 0.15 wt% produces streak defects and requires vacuum venting at -80 kPa.
| Control Point | Measured Range | Method/Instrument |
|---|---|---|
| Chill roll surface temperature | 30–40 °C | Infrared pyrometry |
| MDO stretch ratio | 4.5–5.5 | Differential roll speed calculation |
| TDO oven zone temperature | 160–175 °C | Multizone thermocouples |
| Annealing section temperature | 140–150 °C | Contact thermocouple |
| Corona discharge level | 38–42 mN/m | ISO 8296:2003 wetting test |
Compliance for food-contact BOPP structures is governed by FDA 21 CFR 177.1520(c)(1.1) for olefin polymers and by EU Regulation 10/2011 with an overall migration limit of 10 mg/dm² under EN 1186-1:2002. REACH 1907/2006 requires SVHC screening below 0.1 wt% per candidate list entry; RoHS 2011/65/EU applies when the film enters electrical/electronic packaging, with Pb below 1000 ppm and Cd below 100 ppm by XRF screening per IEC 62321-3-1:2013. Terminal products from this configuration include transparent snack food overwrap, confectionery twist wrap, pressure-sensitive label face stock, and tobacco overwrap; opaque cavitated film feeds into ice cream wrap and decorative gift wrap.
In chill-roll cast film production, the dominant variable separating cast film from tenter-process BOPP is the suppression of uniaxial orientation and the retention of low residual strain, which allows downstream lamination without anisotropic tear propagation. Cast film lines using PP1572 extrude at 230–250 °C through a slot die with a lip gap of 0.8–1.2 mm and an air gap of 5–15 mm before the web contacts a polished chill roll at 20–30 °C. A vacuum box or air knife forces the melt against the roll to reduce air entrapment; chill roll surface roughness below 0.025 µm Ra and temperature uniformity of ±1.0 °C across the width are required to maintain haze below 3% when measured by ASTM D1003-13. The formulation uses PP1572 at 100 parts by weight, a slip/antiblock package limited to 0.05–0.15 wt% for lamination films to avoid reducing adhesion of solvent-based inks, and an antifog masterbatch at 0.5–1.5 wt% for fresh-cut produce packaging. Pre-drying of moisture-sensitive masterbatches at 70–80 °C for 2–4 h is recommended when relative humidity exceeds 60%, although neat PP1572 does not require desiccant drying. Compliance includes EU Regulation 10/2011 and FDA 21 CFR 177.1520(c)(1.1); for non-food industrial wrap, REACH 1907/2006 and RoHS 2011/65/EU are the applicable screening frameworks. Terminal products include lamination outer webs for stand-up pouches, bakery film, textile packaging, and floral wrap; the low orientation also makes the cast film suitable for heat-assisted form-fill-seal lines that require isotropic puncture resistance.
When PP1572 is used as the extrusion coating layer on aseptic paperboard, melt temperatures of 290–315 °C are required to generate polar carbonyl and carboxylic groups through thermo-oxidative chain scission at the coating-substrate interface. The molten web exits a T-slot die with a 0.5–0.8 mm lip opening and is drawn across an air gap of 150–250 mm before the nip between a chill roll and pressure roll; oxidation of the web surface in the air gap is the primary adhesion mechanism to corona-pretreated board and to aluminium foil. Neck-in of 20–40 mm per edge is typical on a 1.2 m wide die, and edge trim generation ranges from 3–6% of total throughput. Blending 10–20 wt% low-density polyethylene into PP1572 lowers neck-in and improves draw stability, but reduces the maximum continuous use temperature and should be restricted to non-retort applications. A tie layer of maleic anhydride grafted polypropylene at 5–10 g/m² is coextruded when the structure includes untreated aluminium foil; the target peel strength after lamination is 3.0–5.0 N/15 mm under ASTM F904-16. Formulation addition ratios are PP1572 80–95 wt%, LDPE 5–20 wt%, antioxidant masterbatch 0.05–0.10 wt%, and, for white barrier board, TiO2 masterbatch at 5–10 wt%. Regulatory compliance for paperboard contact falls under FDA 21 CFR 176.170(c), with the PP layer additionally meeting 21 CFR 177.1520(c)(1.1); EU Regulation 10/2011 applies with overall migration limits of 10 mg/dm². Terminal products include aseptic liquid cartons, paper cups, folding carton barriers, and frozen food overwrap; the structure is not recommended for retort pouches because homopolymer PP lacks sufficient long-term creep resistance above 120 °C.
For water-quench raffia tape lines, PP1572 is processed at 230–250 °C, with a film thickness of 60–120 µm and quench water temperature of 30–40 °C to minimize premature edge fibrillation during slitting. The slit tapes, typically 2.5–6.0 mm wide, are reheated in a hot-air oven at 130–160 °C and drawn between godet stands at a ratio of 6.0:1–8.5:1; annealing on heated godets at 120–140 °C with 2–3% relaxation stabilizes tape shrinkage before winding. Draw resonance and tape rupture occur when the oven temperature deviates by more than ±5 °C across the web width, which imposes a narrow control window on multi-zone recirculation heaters. The formulation is PP1572 at 100 parts by weight, HALS-based UV masterbatch at 2.0–6.0 wt% for outdoor-grade tape, pigment masterbatch at 1.5–4.0 wt%, CaCO3 masterbatch at 2.0–8.0 wt% to reduce elongation and improve slit-edge cleanliness, and a phenolic/phosphite antioxidant package at 0.10–0.30 wt%. Fibre and woven fabric mechanical requirements follow ISO 21898:2004 for FIBC safety factor of 5:1; accelerated weathering for UV-stabilized tapes is evaluated by ISO 4892-2:2013 xenon arc exposure. Compliance also includes REACH 1907/2006 for chemical substances in the stabilizer system and EU Regulation 10/2011 where the woven sack contacts food directly, though food-contact FIBC configurations are typically lined with an additional sealant film. Terminal products include flexible intermediate bulk containers, woven polypropylene sacks, ground cover fabric, carpet backing tape, and rope fibrillated yarn.
When homopolymer sheet is substituted for impact copolymer in thin-wall dairy cups, the operating window is limited to cold-storage and room-temperature dairy items that do not undergo drop loading below 0 °C, because homopolymer PP exhibits a ductile-to-brittle transition that reduces puncture resistance under chilled shock tests. Sheet extrusion is performed at 230–250 °C through a flat die with a three-roll stack temperature of 60–90 °C; sheet thickness is 0.2–1.0 mm depending on cup depth and draw ratio. Thermoforming uses plug-assisted positive air pressure at 4–6 bar, sheet surface temperature of 150–180 °C, and mold temperature of 20–60 °C; part thickness variation is held below 0.05 mm through plug material selection of syntactic foam or polyamide. The formulation includes PP1572 at 100 parts by weight, a sorbitol-based clarifying concentrate at 2.0–5.0 wt% with active clarifier content in the final sheet between 0.10–0.25 wt%, and a slip/antiblock package at 0.10–0.25 wt% for denesting of stacked cups. Trim scrap is reground and re-fed at 10–20 wt% of the sheet extruder feed, with regrind particle size classified through a 4 mm screen to avoid melt-pressure fluctuations above ±1.5 bar. Compliance under FDA 21 CFR 177.1520(c)(1.1) and EU Regulation 10/2011 is required; for dairy packaging, migration testing is conducted in 3 wt% acetic acid simulant per EN 1186-1:2002. Terminal products include thin-wall yogurt cups, vending cups, portion packs, and stackable dessert inserts; the material is not suitable for hot-fill above 90 °C or for retort dairy processing.
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ExxonMobil PP1572 is a nucleated polypropylene homopolymer engineered for injection molding processes that demand a balance of medium melt flow, high stiffness, and rapid crystallization. The grade exhibits a melt mass-flow rate (MFR) of 12 g/10 min when tested at 230 °C under a 2.16 kg load according to ISO 1133-1:2022. Density stands at 0.90 g/cm³ per ISO 1183-1. Tensile stress at yield, measured on 4 mm thick injection-molded specimens following ISO 527-2, averages 33 MPa, with a tensile modulus of 1550 MPa. Flexural modulus under ISO 178 is 1500 MPa, and notched Izod impact strength at 23 °C registers 2.5 kJ/m² (ISO 180/A). The heat deflection temperature (HDT) at 0.45 MPa, per ISO 75-2 method B, reaches 95 °C. The incorporated nucleation package shifts the peak crystallization temperature to approximately 128 °C as recorded by differential scanning calorimetry, which contracts cycle time by 10–15 % relative to non-nucleated homopolymer grades of comparable MFR. This combination of thermal and rheological properties suits the material for high-output production of thin-wall packaging, caps, closures, and rigid appliance components where part ejection rigidity and dimensional control are critical.
With an MFR of 12 g/10 min, PP1572 delivers a spiral flow length of approximately 400 mm at a wall thickness of 2.5 mm under an injection pressure of 800 bar, measured on a hydraulic clamping machine with a 20:1 L/D general-purpose screw. Melt temperatures between 230 °C and 250 °C are recommended; nozzle temperatures should remain within 220–250 °C. For thin-wall moldings below 1.0 mm nominal thickness, a mold surface temperature of 30 °C combined with profiled injection velocity—peak fill speeds exceeding 150 mm/s—achieves complete cavity filling before freeze-off. Production-scale trials on a 250-ton toggle-clamp machine have demonstrated that holding pressure must be maintained for a minimum of 1.5 s per millimeter of gate depth to suppress sink marks in ribbed geometries. Residence time at temperatures above 250 °C should be limited to 5 min to prevent thermo-mechanical chain scission, which is quantifiable as a reduction in MFR exceeding 5 % from the virgin value and a corresponding drop in notched impact strength. Drying is normally unnecessary when moisture content is below 0.05 %; however, when storage conditions exceed 60 % RH at ambient temperatures above 30 °C, a desiccant drying cycle of 2–3 h at 80 °C eliminates splay and surface defects. Hot-runner systems should employ externally heated manifolds with valve gates to minimize dead spots, as PP1572 has a higher tendency to drool at nozzle shut-offs compared to fractional-melt grades due to its lower zero-shear viscosity at processing temperature.
The semi-crystalline morphology induced by the nucleation system yields post-molding shrinkage values of 1.0–1.2 % in the flow direction and 1.2–1.4 % perpendicular to flow for a 2 mm plaque, measured after 24 h conditioning at 23 °C per ISO 294-4. Because crystallinity reaches 55–60 %, components exhibit minimal cold-flow under sustained static loads at temperatures up to the 95 °C HDT threshold. In underpinned bracket applications exposed to a continuous service temperature of 90 °C, dimensional change over 500 h is typically less than 0.3 %, provided part design eliminates sharp internal radii below 0.5 mm and incorporates gussets to distribute mechanical stress. Where rigidity at 100–110 °C is mandated, a 20–30 wt% chemically coupled glass-fiber masterbatch pushes HDT to approximately 150 °C but introduces anisotropic shrinkage that requires mold compensation factors of 0.2–0.5 % in the transverse direction. Annealing unfilled PP1572 parts at 100 °C for 1 h in a recirculating air oven can relieve residual orientation stresses and improve tolerance retention by as much as 0.1 % absolute, yet rapid quenching from the melt to below 70 °C must be avoided because differential skin-core crystallization rates create a residual stress profile that manifests as warpage after thermal cycling between –20 °C and 60 °C.
PP1572 is formulated to satisfy the compositional requirements of FDA 21 CFR 177.1520(c) 1.1a for polypropylene homopolymers used in contact with all food types under Conditions of Use A through H. The resin also conforms to EU Regulation (EU) No. 10/2011, with overall migration into food simulants A, B, and D2 not exceeding 10 mg/dm² after 10 days at 40 °C. Hexane-soluble extractives, determined by the FDA procedure at 50 °C for 2 h, remain below 1.5 % of the total mass. The additive formulation contains only substances listed in the Union positive list, with specific migration limits respected for antimony-based catalyst residues (below 0.04 mg/kg) and phosphite antioxidants. The grade is manufactured without animal-derived stearates or phthalate plasticizers, a relevant distinction for vegan-sensitive or infant-feeding articles. Processors must retain control over any masterbatch additions: colorants and slip agents not pre-cleared under 10/2011 will invalidate the base resin’s food-contact status. For repeated-use kitchenware subjected to microwave reheating at 100 °C for 30 min, long-term extraction data from 3 % acetic acid simulant confirm no detectable degradation of the polymer matrix, although fatty food contact at temperatures above 130 °C is excluded owing to softening and swelling of the amorphous phase.
The melt rheology of PP1572 occupies a deliberate niche within the ExxonMobil homopolymer portfolio. PP1012, characterized by an MFR of 1.5 g/10 min and a tensile modulus of 1450 MPa, supplies high melt strength essential for extrusion blow molding and sheet thermoforming but cannot fill long flow-path injection molds without excessive clamp force. PP1440, with an MFR of 14 g/10 min and a faster crystallization rate, offers marginal cycle-time gains yet sacrifices roughly 5–8 % in tensile modulus relative to PP1572 because it lacks the same nucleating agent. At the opposite end of the stiffness–impact spectrum, impact copolymer PP7032 (MFR 4 g/10 min) trades flexural modulus down to 1200 MPa for a notched Izod of 9 kJ/m² at 23 °C, making it preferable for luggage shells and automotive interior crash-zone trim but unsuitable for snap-fit assembly elements that rely on high flexural rigidity. The table below consolidates these property deltas, anchoring the position of PP1572 as the choice where a throughput-oriented MFR above 10 g/10 min cannot come at the expense of ambient-temperature stiffness.| Grade | MFR (g/10 min) | Tensile Modulus (MPa) | Flexural Modulus (MPa) | HDT 0.45 MPa (°C) | Notched Izod at 23 °C (kJ/m²) | Characteristic Processing |
|---|---|---|---|---|---|---|
| PP1012 | 1.5 | 1450 | 1350 | 90 | 4.0 | extrusion blow molding |
| PP1572 | 12 | 1550 | 1500 | 95 | 2.5 | thin-wall injection molding |
| PP1440 | 14 | 1450 | 1400 | 92 | 2.2 | high-speed packaging |
| PP7032 | 4 | 1200 | 1200 | 80 | 9.0 | impact-modified parts |
The divergence in stiffness becomes operationally decisive when evaluating load-bearing snap-fits. PP1572 maintains a secant modulus above 1400 MPa through 50 °C, whereas PP7032 falls below 1000 MPa at the same temperature, leading to a reduction in retention force that may exceed 30 % after 1000 insertion cycles. For living-hinge designs, the homopolymer’s higher yield stress (33 MPa versus 25 MPa for the impact grade) allows a hinge thickness reduction of approximately 0.1 mm while preserving the same flexural endurance limit across 10⁴ cycles. Nevertheless, converters moving from an impact copolymer must adjust hold pressure upward by 5–10 % to compensate for the steeper pressure-volume-temperature slope of the homopolymer melt, otherwise sink marks appear in rib bases with thickness ratios exceeding 1:1.5.
Thermo-oxidative aging imparts a steep decline in mechanical integrity once the additive protection package is consumed. Long-term heat aging per ISO 4577 at 135 °C in forced-air ovens establishes a half-life of tensile strength—defined as the time to reach 50 % retention of the original 33 MPa—at approximately 20 days for unfilled PP1572. This value drops to 8 days when the regrind fraction exceeds 30 % without supplemental stabilization. The Underwriters Laboratories relative thermal index (RTI) for the grade is typically rated at 105 °C for electrical and mechanical without impact, but the permissible continuous-use temperature under constant load must be derated by at least 10 °C if the stress exceeds 5 MPa. At 110 °C, oxidation induction time measured by DSC at 200 °C in oxygen decreases from 40 min for the virgin resin to less than 10 min for parts previously held in boiling water for 100 h, evidencing extraction of hindered phenolic stabilizers. Direct contact with copper or brass fittings accelerates hydroperoxide decomposition; hence metal-insert molded components intended for service above 80 °C must use stainless-steel inserts and, where unavoidable, the addition of 0.2–0.5 wt% of a metal-deactivator masterbatch is obligatory. Processors relying on hot-oil thermolators running above 90 °C should purge the barrel with a high-MFR polypropylene after shutdowns exceeding 30 min to prevent gel formation from degraded material accumulating on screw flights, which later dislodges as black specks in the melt stream.
The regulatory certification landscape for PP1572 spans multiple jurisdictions and end-use sectors. The grade complies with RoHS Directive 2011/65/EU and its amendments, as verified by X-ray fluorescence screening for restricted substances. It is listed in the SCIP database under the relevant Article 33 REACH entries and contains no substances of very high concern (SVHC) above the 0.1 % w/w threshold. For potable water contact, certified formulations meet the requirements of BS 6920 and ACS (France) when processed without prohibited additives. The table below collates the primary standards with their scope.| Standard | Scope / Test Method | Status |
|---|---|---|
| FDA 21 CFR 177.1520 | Olefin polymers, para (c) item 1.1a | satisfies compositional and extractives limits |
| EU 10/2011 | Plastic materials and articles intended to come into contact with food | overall migration <10 mg/dm² |
| China GB 9685-2016 | Positive list of additives for food contact materials | additive formulation within permitted limits |
| RoHS 2011/65/EU | Restriction of hazardous substances in electrical and electronic equipment | conforms to substance restrictions |
| REACH (EC) No. 1907/2006 | Registration, evaluation, authorisation of chemicals; SVHC content | no SVHC above 0.1 % |
| USP <42> / <661.1> | Plastic packaging materials for pharmaceuticals | base resin meets extractable profile; final article responsibility of converter |
For medical device applications requiring USP Class VI certification, PP1572 has not been pre-certified as a compound; however, the feedstock polymer passed cytotoxicity, sensitization, and intracutaneous reactivity testing according to ISO 10993-5 and 10993-10 in independent screening studies with standard processing aids. Converters assuming design-control responsibility must re-validate the final sterilized component, paying particular attention to the extractable profile after ethylene oxide or gamma irradiation at doses up to 50 kGy, which induce a small but measurable increase in low-molecular-weight oxidation products. These by-products can raise total organic carbon in leachable assays by 0.5–1.0 µg/cm², demanding an additional 24 h degassing protocol under vacuum at 50 °C before packaging.
