| HS Code | 671123 |
| Melt Flow Rate | 74 g/10 min |
| Density | 0.91 g/cm³ |
| Tensile Strength At Yield | 34 MPa |
| Elongation At Yield | 6% |
| Flexural Modulus | 1800 MPa |
| Notched Izod Impact 23 C | 2.0 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 105 °C |
| Vicat Softening Temperature | 148 °C |
| Rockwell Hardness | R110 |
| Melting Point | 160 °C |
As an accredited Profax PP Homopolymer PL874 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Profax PP Homopolymer PL874 is supplied in 25 kg bags, packaged as free-flowing pellets for safe handling and storage. |
| Container Loading (20′ FCL) | Load 20′ FCL with Profax PP Homopolymer PL874; secure pallets, protect from moisture/contamination, and follow safe handling procedures. |
| Shipping | Profax PP Homopolymer PL874 is a polypropylene homopolymer resin supplied as free-flowing pellets. It ships in lined paper bags, bulk bags, or railcars. Non-hazardous under normal transport conditions; keep dry, avoid dust accumulation, and store away from ignition sources. |
| Storage | Store Profax PP Homopolymer PL874 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid stacking pallets excessively high to prevent bag damage. Under proper conditions, shelf life is typically 12 months from date of manufacture. |
| Shelf Life | Shelf life is typically 12 months from date of shipment when stored in original, unopened packaging in cool, dry conditions. |
At a melt temperature of 225–235°C and mold temperature of 15–30°C, Profax PP Homopolymer PL874 fills 0.8–1.2 mm wall sections in high-speed injection molding tools without shear-induced splay when hot-runner pressure drop remains below 25 MPa. Cavity entry pressure is normally 85–110 MPa, with pack pressure between 60 MPa and 75 MPa; if cushion position fluctuates more than 2.0 mm, shot-weight drift reaches 0.12–0.25 g in 32-cavity stack molds, producing short shots in the last-fill cavities. The formulation for rigid food-contact packaging consists of 100 parts PL874, 0.03–0.08 phr primary phenolic antioxidant, 0.03–0.08 phr secondary phosphite stabilizer, 0.02–0.05 phr acid scavenger, and 1.5–3.0 wt% of a TiO₂-based white masterbatch selected for food-contact compliance. Pre-drying at 80°C for 2 h is required after resin storage above 60% relative humidity; otherwise surface splay appears at the gate and reduces burst strength of the final cup. The finished article is assessed under FDA 21 CFR 177.1520(c), while EU Regulation 10/2011 requires total migration into food simulants to remain below 10 mg/dm²; these are article-level clearances, not resin-level guarantees. Downstream conversion uses 350–500 tonne injection molding machines with hot-runner systems and stack molds, producing dairy cups, deli containers, microwaveable trays, and measurement scoops with part masses from 6 g to 42 g.
Closure manufacturing on 64-cavity valve-gated hot-runner tooling reveals that cavity-to-cavity fill variance greater than 3 MPa across manifold zones produces inconsistent bridge thickness and elevated torque range during end-of-line sealing tests. Profax PP Homopolymer PL874 is processed at melt temperatures of 215–230°C and mold temperatures of 12–20°C, with holding pressure 55–75 MPa and post-gate cooling time of 2.8–4.5 s. The formulation for tamper-evident beverage caps uses 100 parts PL874, 0.05–0.10 phr nucleating agent to shift crystallization onset to higher temperature and reduce cycle time, 1.0–2.5 wt% food-grade lubricant/antistatic masterbatch, and 0.02–0.05 phr acid scavenger; slip additive masterbatch above 2.5 wt% causes plate-out on mold cores and can interfere with liner adhesion if the closure is induction sealed. Compliance for food-contact closures rests on FDA 21 CFR 177.1520(c), EU Regulation 10/2011, and REACH Regulation 1907/2006, with attention to Article 33 communication duties for candidate list substances. Downstream conversion includes high-cavitation injection molding and compression molding from preheated preforms; terminal products are single-piece caps, two-piece sports closures, and tamper-evident bands for mineral water and carbonated soft drinks.
Valve-pin timing in stack tools must be sequenced within 0.1 s across gate groups to prevent flow imbalance during switchover. At hot-runner manifold temperatures above 240°C for more than 6 min, melt-phase oxidation shifts yellowness index upward by more than 2 units per ASTM E313, and the resulting molecular-weight reduction changes closure seal torque outside the reference band. Excessive holding pressure above 75 MPa creates gate-stringing and ejector-pin push marks that can initiate stress cracking in contact with alcohol-containing beverages. Published data for this specific configuration is limited beyond standard resin datasheet values, so mold trials using cavity pressure transducers are required to validate the 3 MPa balance criterion before full tool acceptance.
For appliance trim and interior parts, dimensional stability during intermittent heating is dominated by the linear coefficient of thermal expansion of 100–150 × 10⁻⁶ K⁻¹ per ISO 11359-2:2021; a 150 mm long molding expands by 1.5–2.3 mm between 23°C and 80°C, so snap-fit clearance must absorb at least 3 mm of relative movement. The formulation uses 100 parts PL874, 0.1–0.2 phr primary antioxidant, 0.1–0.3 phr nucleating agent, and 0.3–0.8 wt% of a UV stabilizer masterbatch for parts exposed to indirect sunlight or fluorescent service. Injection molding on 300–650 tonne machines with cold runner or valve-gated hot-runner systems operates at melt temperature 230–250°C, mold temperature 25–50°C, and pack pressure 40–60 MPa; wall stock ranges from 2.0 mm to 3.2 mm. Final electric appliance components must meet IEC 60335-1, and flame classification is tested per UL 94 at the end-use thickness; unfilled homopolymer polypropylene typically carries a UL 94 HB rating at 3.0 mm, not a V rating. Terminal parts include washing machine outer trim, refrigerator shelf frames, ice trays, storage bins, and desk accessory trays.
Cleanroom conversion of laboratory consumables from Profax PP Homopolymer PL874 requires the resin to be pre-blended with 0.02–0.05 phr acid scavenger and 0.03–0.08 phr phenolic antioxidant; slip additives and antistatic compounds are excluded because low-molecular-weight migrants interfere with cell-based assays and fluorescence detection at the 10⁻¹⁰ g/cm² extraction threshold. The formulation is processed at melt temperatures of 220–240°C and mold temperatures of 15–25°C in cleanrooms meeting ISO 14644-1 class 7, using hardened stainless steel tooling with vent depths not exceeding 0.010–0.015 mm to avoid flash and cold-slug ejection. Melt cushion must be maintained between 1.5 mm and 2.5 mm; a cushion below 1.0 mm causes incomplete packing and microvoids at the tip, while a cushion above 3.0 mm extends residence time and generates carbonyl-containing degradation products detectable as stiffness retention loss per ASTM D638-14. Article-level compliance for laboratory plasticware includes USP 661.1, ISO 10993-5 for cytotoxicity, and FDA 21 CFR 177.1520(c) when food-contact labware is included in the same production cell. Terminal products include pipette tips, microcentrifuge tubes, petri dishes, and reagent reservoirs with shot weights from 0.8 g to 18 g. Steam autoclaving at 121°C for 20 min is common; repeated autoclaving beyond 30 cycles requires tensile retention validation per ASTM D638-14. If gamma irradiation at 25–40 kGy is specified, the formulation must include 0.1–0.3 wt% of a radiation stabilizer masterbatch, because unstabilized homopolymer PP undergoes chain scission and embrittlement.
When PL874 is compounded on a co-rotating twin-screw extruder with an L/D ratio of 40:1 and a barrel temperature profile of 230–250°C, it serves as the continuous-phase carrier for 20–30 wt% talc, 0.1–0.2 phr primary antioxidant, 0.05–0.10 phr secondary phosphite, and 0.3–0.8 wt% maleic anhydride-grafted polypropylene when mineral-to-matrix adhesion is required for weld-line strength. Talc is fed through a side feeder downstream of the melt-seal zone to avoid screw wear in the upstream conveying section; screw speed is maintained at 450–600 rpm, and melt temperature is held below 255°C to limit oxidative degradation of the homopolymer carrier. Amine-based lubricants are excluded from the talc compound because residual amines accelerate thermo-oxidative degradation of the PP carrier during long residence on the pelletizing strand. The strand is cooled in a water ring pelletizer and dried to below 0.05 wt% moisture before bagging. Compliance for automotive interior and appliance compounds references REACH Regulation 1907/2006, RoHS Directive 2011/65/EU, and, where required, VDA 278 for volatile organic compound and fogging performance. Terminal products from the resulting talc-filled compounds include automotive heater housings, washing machine drain pump housings, and ventilation deflectors.
Stack molds for nestable industrial crates require continuous shot weights of 1.8–3.2 kg, clamp forces from 8,000 kN to 12,000 kN, and melt temperatures of 230–250°C; at these shot sizes, the limiting property is low-temperature impact resistance, not flow length. The formulation blends 100 parts PL874 with 0.05–0.10 phr primary antioxidant, 0.03–0.06 phr acid scavenger, and 2.0–4.0 wt% of a metallocene ethylene-propylene impact modifier masterbatch to raise Izod impact at 0°C above 6 kJ/m² measured per ISO 180:2019, although the final value depends on part thickness and processing history. Compliance for reusable distribution packaging is assessed under EN 13117-1:2000 for palletized transport compatibility; food-contact crates for agricultural produce must meet EU Regulation 10/2011. Downstream conversion uses accumulator-assisted injection units with screw diameters from 90 mm to 120 mm and mold temperatures of 15–35°C; products include nestable fruit and vegetable crates, returnable logistics totes, and ventilated distribution boxes.
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Profax PP Homopolymer PL874 is a high-flow polypropylene homopolymer supplied for injection moulding applications where thin-wall filling, short cycle times, and elevated stiffness are primary requirements. The melt mass-flow rate is published at 18 g/10 min when measured at 230 °C under a 2.16 kg load per ISO 1133-1:2022. Density is 0.900 g/cm³ per ISO 1183-1. The resin belongs to the isotactic PP homopolymer class, with crystalline melting typically observed in the 160–165 °C range. Because PL874 lacks ethylene comonomer, the backbone produces higher crystallinity, higher tensile and flexural stiffness, and lower low-temperature impact resistance than random copolymers. This structural difference determines the product’s most frequent use: rigid injection-moulded parts that do not require optical clarity or sub-zero ductility.
| Property | Test method | Published nominal value |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 18 g/10 min |
| Density | ISO 1183-1 | 0.900 g/cm³ |
| Tensile stress at yield | ISO 527-2 | 34 MPa |
| Tensile strain at yield | ISO 527-2 | 10 % |
| Flexural modulus | ISO 178 | 1,400 MPa |
| Notched Izod impact at 23 °C | ISO 180/A | 2.5 kJ/m² |
| Heat deflection temperature, 0.45 MPa | ISO 75-2/B | 90 °C |
The designation PL874 is product-specific and was developed as a controlled-rheology homopolymer. It is not equivalent to a general-purpose 20 g/10 min MFR homopolymer, nor to a low-flow extrusion homopolymer. The molecular weight distribution, additive package, and stabilisation system are formulated for injection moulding regimes with high shear rates and short residence times. Published data for continuous extrusion, blow moulding, or thermoforming of this exact grade is limited; those processes would typically require a lower-MFR or higher-melt-strength polypropylene type.
Lower-flow homopolymers with MFR values in the 2–10 g/10 min range retain longer average chain length and exhibit higher melt viscosity. That molecular characteristic improves melt strength and impact-related behaviour in thick sections, but it raises injection pressure requirements and limits fill distance in thin-wall cavities. PL874, at 18 g/10 min, represents an intermediate flow class. The controlled-rheology modification narrows molecular weight distribution and reduces high-shear viscosity, which permits filling of sections down to approximately 0.6 mm in adequately vented tools at melt temperatures of 220–240 °C. However, the same modification reduces melt strength relative to fractional-MFR homopolymers. This places a practical boundary on PL874 in deep-draw thermoforming or thick parison extrusion, where sagging and non-uniform wall distribution become process-limiting.
Compared with very high-flow homopolymers above 50 g/10 min, PL874 retains a higher tensile yield and greater stiffness. Resins in the 50–100 g/10 min range are often selected for ultra-thin wall injection moulding of food containers, but those products frequently exhibit lower molecular weight, reduced tensile yield, and increased tendency for warpage in asymmetric geometries. PL874 therefore occupies a middle processing window: lower-viscosity flow than conventional general-purpose homopolymers, without the full mechanical penalty associated with very high-flow grades. The melt-flow ratio and spiral-flow length should be confirmed with the current certificate of analysis because lot-to-lot variation is influenced by reactor conditions and additive batch adjustments.
Injection moulding machines with general-purpose polyolefin screws are suitable. Screw L/D ratio is conventionally specified in the 20:1–25:1 range, with compression ratio of 2.5:1–3.0:1. A free-draining non-return valve is preferred because the resin’s low viscosity at processing temperature can exacerbate check-ring leakage if the valve is worn. Melt temperature should be maintained between 210 °C and 250 °C, with the lower portion of the range applied to parts with thick sections where cycle time and warpage control dominate. Mould temperature is typically 20–50 °C. Higher mould temperature improves surface appearance and reduces orientation-induced stress, but it increases cooling time and may raise overall cycle time by 15–30 % depending on wall thickness and cooling-channel design.
Drying is not generally required for PL874 under normal storage conditions because polypropylene is not hydroscopic. However, if sacks are stored in an environment with relative humidity above 60 % and condensation is visible on pellet surfaces, pre-drying at 80 °C for 2 h is used to reduce surface splay. Long residence time at melt temperatures above 240 °C should be avoided. Accumulated residence time beyond 5 min can produce measurable molecular weight reduction, which appears as a progressive drop in melt viscosity and a decrease in tensile yield. The practical consequence is that start-up after a tool change, or interruption of automatic cycling, should include purging with fresh polymer before stable part quality is re-established.
When a converter evaluates PL874 as a substitute for a random copolymer in packaging, the comparison centres on stiffness, impact behaviour, and optical clarity. Random copolymers incorporate low levels of ethylene, which disrupts crystallite size and yields a clearer, more ductile material. PL874 homopolymer has a flexural modulus of approximately 1,400 MPa per ISO 178. Random copolymers of comparable MFR are frequently reported in the 900–1,100 MPa range. The stiffness advantage supports downgauging in caps, closures, overcaps, and non-clarity-sensitive containers where stacking strength or dimensional rigidity is a failure criterion.
The impact penalty is equally significant. PL874 notched Izod impact at 23 °C is published in the region of 2.5 kJ/m² per ISO 180/A. Random copolymers typically provide higher values, often in the 6–10 kJ/m² range, and some impact copolymers exceed 20 kJ/m² at 23 °C while retaining ductile failure at sub-zero temperatures. PL874 is therefore not a drop-in replacement when the application is a thin-wall clear deli container or a frozen-food lid requiring low-temperature ductility. For caps, overcaps, and rigid packaging accessories where clarity is not the primary selling attribute, the homopolymer provides a cost-effective stiffness pathway relative to copolymer systems.
Optical testing under ASTM D1003 shows that an unclarified homopolymer such as PL874 exhibits higher haze than a clarified random copolymer. The product is not typically specified for clarity-critical articles. If transparency is required, a clarified random copolymer, a clarified high-flow homopolymer, or a controlled nucleated grade may be appropriate. PL874 can be nucleated or coloured during conversion, but those modifications alter shrinkage, impact, and processing behaviour and must be validated through pilot trials before production commitments.
Because the homopolymer backbone lacks ethylene comonomer, crystallinity is higher and linear mould shrinkage is more pronounced than in random copolymers. Linear mould shrinkage for unfilled PP homopolymers is commonly specified in the 1.0–2.0 % range. Actual shrinkage depends on wall thickness, melt temperature, mould temperature, holding pressure, gate freeze-off time, and orientation. Thin-wall parts moulded from PL874 exhibit anisotropic shrinkage. Flow-direction shrinkage tends to be lower than transverse shrinkage because of molecular orientation frozen during filling. A gate-seal study is required to establish a holding-pressure profile that prevents premature gate freeze. If the gate freezes before packing is complete, transverse shrinkage increases and sink marks or excessive warpage may appear in ribs, bosses, or section transitions.
In multi-cavity tools, cavity-to-cavity shrinkage differences are controlled by balancing runner length, gate geometry, and cooling layout. Sequential valve gating may be used when flow-length-to-thickness ratios exceed the tool’s filling capacity. Post-mould cooling fixtures are often required for flat lids or rectangular containers because the part continues to shrink after ejection; uncontrolled free-standing cooling leads to warpage in the first 24–48 h of post-mould annealing. Dimensional inspections should therefore be conducted after a stabilisation period under controlled ambient conditions per ISO 291, not immediately at the press.
The property values reported in product literature are generated from test specimens moulded under standard conditions and conditioned under ISO 291. Tensile stress at yield is measured per ISO 527-2, flexural modulus per ISO 178, notched Izod impact per ISO 180/A, and heat deflection temperature per ISO 75-2/B. These are short-term single-point data, not design allowables. A part moulded from PL874 may exhibit different tensile behaviour when moulded with high orientation, internal weld lines, or thickness variations. For continuous load or elevated-temperature service, creep-rupture data must be used rather than tensile yield. Published data for long-term creep and fatigue of this specific PL874 formulation is limited; design verification therefore requires part-level testing under the intended load and thermal environment.
Weld-line strength is a processing-dependent property. In homopolymer PP, weld lines can reduce tensile strength by 20–40 % depending on melt temperature, mould temperature, and weld-line convergence angle. PL874, with its reduced melt viscosity, can improve weld-line appearance and fill, but it does not eliminate the mechanical weakness at the knit line. Gate placement should avoid loading weld lines in tension. When a part contains multiple gates, mould-filling simulation followed by short-shot studies is used to confirm the position of knit lines before tool acceptance.
The upper service temperature boundary is defined by the 0.45 MPa heat deflection temperature of approximately 90 °C. Components under mechanical load above this temperature may exhibit excessive deformation. Unreinforced homopolymer PP also undergoes post-crystallisation and dimensional change when exposed to elevated temperatures. For hot-fill packaging, continuous service above 90 °C, or steam sterilisation, this grade is generally not appropriate without specific validation of the additive package and part design.
Compliance documentation for PL874 must distinguish between resin composition, additive package, convertor-added colourant, and final article conditions of use. A resin compliance statement from the supplier does not automatically clear a finished component unless the converter has verified the final part under the applicable regulation. The table below summarises the typical regulatory framework used for unfilled polypropylene homopolymer grades.
| Regulation or standard | Scope | Verification requirement |
|---|---|---|
| EU REACH 1907/2006 | SVHC candidate list, restrictions, and safety data sheet obligations | Supplier SDS and Article 33 declaration if SVHC content exceeds 0.1 % w/w |
| EU RoHS 2011/65/EU | Lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE in electrical and electronic equipment | Supplier compliance statement; screening per IEC 62321 series if required |
| FDA 21 CFR 177.1520 | Olefin polymers intended for food-contact use in the United States | Specific grade listing and finished-article end-testing under conditions of use |
| EU Regulation 10/2011 | Plastic materials and articles intended to come into contact with food | Overall migration limit of 10 mg/dm² for general food-contact use; specific migration testing where applicable |
For food-contact applications, the converter must confirm that PL874 is covered by an applicable supplier food-contact statement. Polypropylene homopolymers are generally addressed under FDA 21 CFR 177.1520 and EU Regulation 10/2011, but the final material must also account for masterbatch, processing aids, and any post-treatment. For medical, pharmaceutical, or potable-water applications, additional biocompatibility, pharmacopoeial, or NSF/ANSI standards may apply. Those requirements are outside standard polypropylene grade certifications and must be evaluated on the finished device or component. When compliance data for a particular application or regulatory jurisdiction is unavailable, the appropriate path is a supplier statement gap analysis rather than assuming that general-purpose polypropylene approvals are transferable.
