| HS Code | 344545 |
| Density | 0.90 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 20.4 g/10 min |
| Tensile Strength At Yield | 28 MPa |
| Elongation At Yield | 12% |
| Flexural Modulus | 1100 MPa |
| Notched Izod Impact Strength 23 C | 55 J/m |
| Rockwell Hardness | R-90 |
| Heat Deflection Temperature 0 46 Mpa | 95 °C |
| Vicat Softening Point | 150 °C |
| Melting Point | 165 °C |
| Mold Shrinkage | 1.2% |
| Water Absorption 24h | <0.01% |
As an accredited MARPOL COPP 20.4 PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg heat-sealed polypropylene bags, palletized and stretch-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | Load 20′ FCL with MARPOL COPP 20.4 PP Copolymer in sealed bags; stow evenly, secure pallets, avoid moisture and heat. |
| Shipping | MARPOL COPP 20.4 PP Copolymer is a non-hazardous thermoplastic resin supplied as free-flowing pellets. Ship in clean, dry containers or bulk hoppers, using lined bags or FIBCs. Avoid moisture, excessive heat, and contamination. No IMDG classification required, though standard industrial hygiene and safe handling practices apply during transport, storage, and unloading. |
| Storage | Store MARPOL COPP 20.4 PP Copolymer in a cool, dry, well-ventilated area away from direct sunlight, heat, and open flames. Keep containers tightly sealed to prevent moisture ingress and contamination. Avoid stacking excessively high to preserve packaging integrity. Maintain stable temperatures; follow manufacturer’s shelf-life guidelines. Ensure area is clean, and keep incompatible materials separate. |
| Shelf Life | Shelf life is typically 12 months from manufacture if stored unopened in cool, dry conditions away from direct sunlight. |
In high-cavitation thin-wall injection molding cells producing translucent dairy cups and food containers, MARPOL COPP 20.4 is processed at barrel set temperatures of 210–250 °C and tool surface temperatures of 8–15 °C. The melt-flow-rate class of 20 g/10 min under ISO 1133-1:2022 reduces filling pressure in stack molds with 2+2 or 4+4 configurations, but short-shot margins tighten when hot-runner nozzle diameters fall below 0.8 mm. Production-scale trials on electric injection molding machines with clamp force 3,500–6,500 kN show that holding pressure must be ramped from 35 MPa to 55 MPa within 0.3 s to control gate freeze-off and sink marks.
Compliance for direct food contact relies on FDA 21 CFR 177.1520 for olefin polymers and EU 10/2011 overall migration limits of 10 mg/dm² or 60 mg/kg depending on surface-to-volume ratio. Organoleptic suitability is evaluated using brand-owner sensory panel protocols under EC 2023/2006 good manufacturing practice for food contact materials; heavy metals are covered under CONEG model legislation. In formulation, the resin is typically loaded at 95–98 wt% with a clarifier/nucleating masterbatch at 0.15–0.30 wt%, primary antioxidant at 0.04–0.10 wt%, acid scavenger at 0.03–0.08 wt%, and a slip/antiblock combination at 0.5–1.5 wt%. If white commercial packaging is required, titanium dioxide masterbatch is added at 2–4 wt%, which raises viscosity slightly and may require a 5–10 °C increase in melt temperature.
Downstream processing uses high-speed injection molding with screw speeds of 80–150 rpm and backpressure 0.5–1.0 MPa; melt delivery through hot-runner valve gates is sequenced to prevent drool and stringing. Finished part types include 150–500 mL dairy cups, deli containers, and thin overcaps for dry powdered products. Operational boundary: pre-drying is not generally required at ambient relative humidity below 60%; if silo storage exceeds 6 months at relative humidity above 70%, a 80 °C hopper dryer for 2 h is recommended to avoid surface splay from moisture absorption.
Low-temperature ductility in door panel substrates is governed by the ratio of ethylene-octene impact modifier to talc filler and by cooling rate during injection molding. When the modifier level falls below 8 wt% in a 70 wt% resin formulation, Charpy notched impact strength at −20 °C under ISO 179-1:2010 may fall below OEM interior trim acceptance limits. This is a formulation boundary rather than a base resin defect: the impact modifier domains must remain discrete during twin-screw compounding and must not coalesce at melt temperatures above 250 °C.
Compliance for automotive interior applications is documented through IATF 16949 production part approval, REACH EC 1907/2006, and end-of-life vehicle recyclability under EU 2000/53/EC. Fogging behavior is tested with ISO 6452:2021; VOC emissions are quantified by VDA 277 or ISO 12219-1 depending on OEM program. Compounding addition ratios are typically 65–72 wt% MARPOL COPP 20.4, 18–25 wt% talc masterbatch, 8–12 wt% impact modifier, 0.2–0.4 wt% primary/secondary antioxidant, 0.2–0.5 wt% hindered amine light stabilizer, and 1–3 wt% color masterbatch. The talc-to-total ratio controls flexural modulus, targeted between 1,800 MPa and 2,400 MPa under ASTM D790-17, while retaining tensile elongation at break of at least 20% under ASTM D638-14.
Production processing begins with twin-screw extrusion compounding on a co-rotating extruder with L/D 44:1 and side-feeding of talc at zone 5 to limit barrel wear. Melt temperature during compounding is maintained at 180–230 °C, with vacuum degassing at −0.08 MPa. The compound is then injection molded on machines with clamp force 5,000–12,000 kN, melt temperature 220–250 °C, mold temperature 20–35 °C, and holding pressure 80–120 MPa. Sequential valve gating reduces tiger-stripe flow marks and keeps differential shrinkage below 0.4% between gated and end-of-flow regions. Molded components cover lower door panel substrates, glovebox bins, B-pillar lower trim, seat side shields, and HVAC duct housings. Operational limit: high talc levels combined with mold temperatures below 15 °C can produce local delamination at knit lines; weld-line strength should be checked by ISO 527-2 at 23 °C before releasing tool modifications.
Extractable-control studies on injection-molded MARPOL COPP 20.4 pharmaceutical and diagnostic components require lot-level traceability, ISO 13485:2016 cleanroom processing, and validation against USP <661.1> plastic packaging criteria and ISO 10993-5 cytotoxicity. Components that contact human tissue or pharmaceuticals are typically injection molded in an ISO 14644-1 Class 8 cleanroom using oil-free electric injection molding machines, because hydrocarbon oil mist from pneumatic tooling can contaminate surfaces and distort extractable profiles.
Compliance with FDA 21 CFR 177.1520 and EU 10/2011 for olefin food contact is a baseline; medical device programs additionally invoke ISO 10993-1 biological evaluation planning, ISO 10993-5 cytotoxicity, and USP <661.1> physicochemical testing for plastic container systems. Sterilization validation follows ISO 11137-1 for gamma or electron-beam dose selection. Formulation addition ratios for radiation-stable laboratory disposables are 100 phr MARPOL COPP 20.4, 0.3–0.8 phr radiation stabilizer masterbatch, 0.05–0.15 phr primary antioxidant, 0.2–0.5 phr internal release agent, and 0–1 phr color masterbatch. Phthalates and animal-derived additives are excluded; silicone-based processing aids are used only at levels below 0.1 wt% to avoid migration.
Downstream processing uses hot-runner valve-gated tooling with melt temperature 210–250 °C, mold temperature 15–35 °C, injection velocity 100–250 mm/s, and hold pressure 40–70 MPa. After molding, components are packaged in sealed polyethylene bags and exposed to gamma radiation at 25–40 kGy or electron-beam sterilization at 30–45 kGy. Post-sterilization tensile strength retention is evaluated by ISO 527-2; if the radiation stabilizer level is below 0.3 phr, embrittlement can occur after 90 days of storage at 40 °C. Finished components consist of specimen collection containers, reagent reservoirs, assay plate frames, centrifuge tube adapters, and pipette tip rack bodies. Steam autoclaving at 121 °C for 30 min is limited to unsupported wall thickness of 2 mm or less to avoid creep deformation.
Multi-cavity closure tools running MARPOL COPP 20.4 at 220–250 °C melt temperature and 8–20 °C mold temperature produce tamper-evident bands and screw caps with target removal torque between 1.0 N·m and 2.0 N·m when tested by ASTM D2063 or equivalent rotational torque procedures. The impact copolymer structure prevents slit propagation in thin bridge sections during high-speed unscrewing, but the addition of slip masterbatch above 2.0 wt% can reduce static friction enough to cause cap back-off on carbonated beverage finishes. Compliance requirements include FDA 21 CFR 177.1520, EU 10/2011, and good manufacturing practice in food contact under EC 2023/2006. Typical formulation addition ratios are 95–99 wt% MARPOL COPP 20.4, 0.5–2.0 wt% slip masterbatch, 0.04–0.10 wt% primary antioxidant, 0.02–0.08 wt% acid scavenger, and 0–1.5 wt% color masterbatch. High-clarity variants replace slip masterbatch with a non-migrating slip additive at 0.1–0.3 wt%.
Processing is typically by injection-compression molding or high-speed injection molding with valve-gate hot runner. Injection velocities of 100–200 mm/s, holding pressures 50–80 MPa, and cooling time 3–6 s per cavity are typical. Tamper-evident tabs are formed by post-mold slitting or in-mold rotating cores, with tab bridge dimensions maintained at 0.3–0.6 mm. Environmental stress crack resistance in fatty food simulants is evaluated by ISO 22088-3:2005 bent strip specimens; failures in this test are typically initiated at moulded-in stress concentrations in the tamper-evident hinge. Closure configurations produced include sports caps, dispensing caps for single-serve dairy drinks, tamper-evident overcaps for UHT milk, and child-resistant closures where certification is governed by ISO 8317:2015.
During high-humidity shipment of mineral-filled appliance housings, MARPOL COPP 20.4 must be compounded with a coupling agent and an acid scavenger to prevent hydrolysis of filler-matrix interfaces and subsequent loss of weld-line strength. At calcium carbonate or talc loadings of 35–40 wt%, the base resin fraction falls to 58–68 wt%; flexural modulus increases to 2,500–3,500 MPa under ASTM D790-17, but Charpy notched impact strength decreases below typical unfilled impact copolymer values, requiring impact modifier addition at 3–8 wt%.
Compliance for these housings is tied to IEC 60335-1 for appliance electrical safety, UL 94 HB flame classification when called out by the OEM, RoHS 2011/65/EU for heavy metal restrictions, and REACH EC 1907/2006 for SVHC disclosure. Dimensional stability is assessed after 48 h at 80 °C and 95% RH according to ISO 294-4 or equivalent internal specifications. Formulation addition ratios are 58–68 wt% MARPOL COPP 20.4, 30–40 wt% mineral filler masterbatch, 3–8 wt% impact modifier, 0.2–0.4 wt% antioxidant, 0.3–0.8 wt% coupling agent, and 0.1–0.3 wt% release agent. If flame-retardant grades are specified, a phosphorus-nitrogen intumescent package at 5–10 wt% replaces a portion of the mineral filler, but this raises melt pressure and narrows the processing window.
Compounding uses a co-rotating twin-screw extruder with L/D 40:1, side-feeding filler at zone 5, screw speed 250–500 rpm, melt temperature 180–220 °C, and vacuum degassing at −0.07 MPa. Injection molding on machines with clamp force 4,500–12,000 kN uses melt temperature 210–250 °C, mold temperature 30–50 °C, injection pressure 90–130 MPa, and hold time 8–18 s. Weld-line strength is checked by ISO 527-2 at 23 °C; if weld-line strength falls below 70% of base tensile strength, mold gating or venting must be revised. Finished components comprise washing machine outer tubs and impeller housings, vacuum cleaner cyclone housings, rice cooker structural frames, and small appliance base plates. Operational boundary: filled formulations stored in silos above 70% RH require hopper drying at 80 °C for 2–4 h to avoid surface moisture streaks.
Utilized as a carrier resin in twin-screw compounding for glass-fiber reinforced polypropylene, MARPOL COPP 20.4 disperses chopped glass fiber at loadings of 20–30 wt% and provides the base resin fraction for under-hood and structural components. The fiber-matrix interface is maintained with a maleic anhydride-grafted coupling agent at 1–2 wt%, because ungrafted copolymer surfaces cannot transfer shear stress efficiently; without coupling, tensile strength measured by ISO 527-2 after 1,000 h of coolant exposure may decline more than 15%.
Compliance documentation for this downstream route includes IATF 16949 production part approval, ASTM D638-14 and ASTM D790-17 mechanical property certification, UL 94 HB for flammability when required, and REACH EC 1907/2006. Glycol resistance is screened by ASTM D543 or OEM-specific coolant immersion procedures; published data for MARPOL COPP 20.4 under all coolant formulations is limited, so end-users must qualify each coolant package separately. Formulation addition ratios are 100 phr MARPOL COPP 20.4, 20–30 phr chopped glass fiber, 1–2 phr coupling agent, 0.2–0.4 phr primary/secondary antioxidant, 0.1–0.3 phr lubricant, and 0.5–1.0 phr carbon black masterbatch if ultraviolet exposure is expected.
Compounding is performed on a co-rotating twin-screw extruder with L/D 40:1 to 44:1, with glass fiber side-fed at zone 5 or 6 and screw speed 300–600 rpm. Melt temperature during compounding is kept between 230–260 °C to minimize fiber breakage while achieving wet-out. Vacuum degassing at −0.08 MPa removes moisture and volatile sizing by-products. Injection molding of the compounded pellets uses melt temperature 250–270 °C, mold temperature 40–80 °C, injection pressure 100–140 MPa, and backpressure 0.5–1.5 MPa to keep fibers oriented and avoid surface glass exposure. Component geometries produced from this route include engine cooling fan shrouds, radiator end tanks, air intake ducts, battery cooling system brackets, and structural brackets where chemical resistance and dimensional stability are required. Operational boundary: direct coloring with solvent-based liquid color at the hopper is not recommended because the carrier solvent can migrate along the fiber surface and reduce coupling efficiency.
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MARPOL COPP 20.4 PP Copolymer is a heterophasic polypropylene impact copolymer in which an ethylene-propylene rubber phase is dispersed within a semi-crystalline polypropylene matrix. The grade designation COPP 20.4 identifies a copolymer with a nominal melt mass-flow rate of 20.4 g/10 min when measured under ISO 1133-1:2022 at 230 °C and 2.16 kg piston load. The material is positioned for medium-flow injection moulding of thin-wall components that require a controlled balance of cold-impact resistance, stiffness, and fast demoulding. Specific lot-to-lot values remain subject to the supplier certificate of analysis; the property ranges referenced below are representative of the unfilled medium-flow heterophasic PP copolymer class rather than contractual limits.
The heterophasic morphology is produced by sequential gas-phase polymerisation in which the ethylene-propylene rubber domains are dispersed in a continuous polypropylene matrix. This phase structure controls the mechanical response under impact, particularly at temperatures below 0 °C. For unfilled heterophasic PP copolymers with MFR near 20 g/10 min, tensile yield stress measured according to ISO 527-2 commonly falls between 23 MPa and 28 MPa, while notched Charpy impact strength according to ISO 179-1/1eA ranges from 8 kJ/m² to 18 kJ/m² at 23 °C. At −20 °C, the corresponding range narrows to 3.5–6 kJ/m². Flexural modulus under ISO 178 is typically 1000–1350 MPa, and density under ISO 1183-1 is 0.90–0.91 g/cm³. Vicat softening temperature under ISO 306/A50 is generally 145–155 °C, and heat deflection temperature under ISO 75-2/B is 75–95 °C at 0.45 MPa.
In random PP copolymers of similar MFR, ethylene is incorporated into the main chain to reduce haze and improve seal initiation, but low-temperature impact remains below that of heterophasic copolymers. Homopolymer grades provide higher flexural modulus and higher heat deflection temperature but exhibit a sharp ductile-to-brittle transition below 0 °C. The dispersed elastomer phase in COPP 20.4 shifts the failure mode from crack propagation to energy-absorbing craze formation in cold impact, while reducing transparency and reducing modulus relative to homopolymer. This trade-off is quantified by the comparative data shown below.
| Property | Test Method | PP Homopolymer MFR 20 | PP Random Copolymer MFR 20 | Heterophasic COPP 20.4 Class |
|---|---|---|---|---|
| Tensile yield stress | ISO 527-2 | 32–38 MPa | 25–30 MPa | 23–28 MPa |
| Flexural modulus | ISO 178 | 1400–1700 MPa | 950–1200 MPa | 1000–1350 MPa |
| Notched Charpy impact at 23 °C | ISO 179-1/1eA | 2–4 kJ/m² | 5–10 kJ/m² | 8–18 kJ/m² |
| Notched Charpy impact at −20 °C | ISO 179-1/1eA | 1.5–2.5 kJ/m² | 2–4 kJ/m² | 3.5–6 kJ/m² |
| Haze on 1 mm plaque | ASTM D1003 | High | 8–15% | Medium-high |
The difference in morphology also affects post-mould shrinkage and part tolerances. Heterophasic copolymers of the COPP 20.4 class show anisotropic mould shrinkage from 0.8% to 1.5% parallel to flow and 0.6% to 1.2% perpendicular to flow when measured on 60 mm × 60 mm × 2 mm plaques under ISO 294-4. Holding pressure between 60% and 80% of peak injection pressure is required to compensate volumetric shrinkage. Gate freeze must occur only after the packing phase; a packing time that is 0.5–1.2 s shorter than gate freeze time produces sink marks in ribbed bosses and hinge-adjacent sections.
On production-scale reciprocating-screw machines with clamp forces from 80 t to 160 t, barrel profiles of 190–220 °C in the feed zone, 220–240 °C in the metering zone, and 230–240 °C at the nozzle maintain melt homogeneity. A general-purpose screw with L/D 20:1 to 24:1 and compression ratio 2.5:1 to 3:1 provides adequate plastication. Screw rotation should remain between 50 min⁻¹ and 120 min⁻¹; higher speeds in small-diameter barrels may generate melt temperatures above 250 °C and cause chain scission. Backpressure is maintained at 3–7 MPa hydraulic, and decompression is limited to 3–5 mm to avoid nozzle drool.
Injection speed must be matched to wall thickness. For sections between 1.2 mm and 2.5 mm, flow front velocities of 150–300 mm/s are typical. Flow front velocities above 400 mm/s in poorly vented tools cause jetting, gate blush, and gas entrapment at the end of fill. Vent depth for PP impact copolymers should be 0.02–0.03 mm; shallower venting results in local burn marks, particularly in multi-cavity tools with runner branches longer than 150 mm. Cavity-to-cavity weight variation should remain below 1.5% in eight-cavity and sixteen-cavity tools to avoid inconsistent mechanical performance.
Melt-pressure transducer data from the nozzle typically show injection pressures of 60–100 MPa for unfilled medium-flow PP copolymers in conventional cold-runner tools. Peak cavity pressure at the gate commonly falls between 30 MPa and 45 MPa and can serve as a transfer signal for hydraulic injection units. If the processor uses a hot runner with valve gates, sequential opening delay should not exceed 0.3–0.8 s between gates to prevent flow marks in visible packaging surfaces. Published data for the exact MARPOL COPP 20.4 product on a specific mould geometry is limited to supplier run-off documentation; process validation on the intended tool is therefore required.
Process engineers should monitor melt cushion stability because the medium-flow heterophasic copolymer shows a lower pressure sensitivity to gate freeze than fast-cycle random copolymers. A cushion between 3 mm and 6 mm and a holding-time profile from 4 s to 8 s for wall thicknesses below 2 mm are typical starting points. Short shots in thin-wall lids are often caused by insufficient venting at the last fill point or nozzle temperature below 220 °C. Flash in the same tools indicates clamp force inadequate by more than 10%. Published data for this specific product with specific hot-runner systems remains limited, so start-up trials should include cavity-pressure monitoring and destructive burst testing for packaging closures.
Virgin PP copolymer absorbs less than 0.05% moisture at 23 °C/50% RH, and standard injection moulding does not require drying. However, storage in silos or octabins at relative humidity above 60% introduces surface moisture that can produce splay and internal voids in thin-wall mouldings. Under these conditions, pre-drying at 80 °C for 2–4 h in a desiccant dryer is recommended. The same drying condition applies when re-granulated material exceeds 20 wt% of the feed. Processing must avoid contamination from purging compounds containing low-molecular-weight amide lubricants, because residual amide can migrate to the surface and reduce paint adhesion or overmoulded TPO bonding unless the screw and hot runner are fully purged.
For sheet extrusion and thermoforming, COPP 20.4 can be processed on single-screw extruders with 30:1 L/D barrier screws and die temperatures from 230 °C to 250 °C. Chill-roll temperatures from 30 °C to 60 °C control gloss and sheet flatness. The medium-flow heterophasic structure has lower melt strength than high-melt-strength PP grades, so deep-draw thermoforming requires plug-assisted forming and sheet temperature mapping in the 160–180 °C sag window. Edge-trim regranulate addition up to 20 wt% has been used on production sheet lines without measurable loss of notched Charpy impact when the regranulate is free of thermally degraded gel particles.
Weld lines in injection-moulded COPP 20.4 components form where two flow fronts meet at the downstream side of holes, ribs, or multi-gated parts. The notched Charpy impact at the weld line of unfilled heterophasic PP copolymers generally retains only 40% to 60% of the bulk value under ISO 179-1/1eA. Raising melt temperature from 220 °C to 240 °C and increasing mould surface temperature from 30 °C to 50 °C improve interfacial entanglement and raise weld-line strength. Venting at weld-line locations is critical; gas pockets prevent polymer interdiffusion. In hot-runner moulds with multiple gates, valve gate sequencing must avoid trapping air at the meeting point.
In living hinge applications, the medium-flow heterophasic copolymer is less suitable than a homopolymer PP with MFR below 10 g/10 min. The elastomer phase reduces flexural fatigue resistance under repeated bending. For components requiring more than 100,000 hinge cycles, a nucleated homopolymer or a random copolymer with lower rubber content is preferred. This distinction is relevant when replacing homopolymer in packaging closures or appliance latching elements.
Pellets of MARPOL COPP 20.4 should be stored away from direct UV exposure and protected from open flame because polypropylene is combustible. Regranulate from sprues and runners can be blended with virgin material up to 20 wt% for non-appearance automotive interior components without reducing notched Charpy impact when the regranulate is not degraded. Higher regranulate contents above 30 wt% may shift melt flow rate upward and reduce low-temperature impact due to chain scission; the exact limit depends on the number of heat histories. Melt flow rate drift after three passes through a reciprocating-screw machine has been observed in similar medium-flow PP copolymers, with MFR increase of 2–5 g/10 min reported in industrial recycling studies.
Compliance is determined by the finished article, not by the pellet alone. Unfilled PP impact copolymers generally meet the olefin polymer requirements in FDA 21 CFR 177.1520 when extraction testing reflects the intended food-contact temperature and food simulant. For European food-contact applications, overall migration must not exceed 10 mg/dm² under EU Regulation 10/2011. The matrix below summarises the applicable frameworks for typical moulded components.
| Regulation/Standard | Scope | Condition or Clause |
|---|---|---|
| FDA 21 CFR 177.1520 | Olefin polymers for food contact | Compliance depends on end-use extraction conditions and total extractables limits |
| EU Regulation 10/2011 | Plastic food contact materials | Overall migration limit 10 mg/dm²; specific migration limits for ethylene and propylene apply |
| REACH Regulation EC 1907/2006 | SVHC and restriction obligations | No intentionally added SVHC above 0.1% w/w per article |
| RoHS Directive 2011/65/EU | Electrical and electronic equipment | Pb, Hg, Cd, Cr(VI), PBB, and PBDE below homogeneous material limits |
For automotive interior applications, volatile organic compound and fogging behaviour must be validated on the final part. Unfilled heterophasic PP copolymers with controlled additive packages can meet OEM limits of 100 µg/g total VOC under VDA 278 and fogging condensate below 2 mg under ISO 6452, but these results depend on regranulate content, melt residence time, and mould temperature. Processors must not substitute pellet-level certification for cabin air-quality testing when the part is specified for vehicle interiors.
