| HS Code | 661706 |
| Polymer Type | PP Copolymer |
| Melt Flow Rate 230 C 2 16 Kg | 1.7 g/10 min |
| Density | 0.905 g/cm³ |
| Tensile Strength At Yield | 27 MPa |
| Elongation At Yield | 12% |
| Flexural Modulus | 1100 MPa |
| Notched Izod Impact Strength 23 C | 8 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 85 °C |
| Vicat Softening Temperature A 50 | 145 °C |
| Melting Temperature | 165 °C |
As an accredited MARPOL COPP 70.1.7 PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARPOL COPP 70.1.7 PP Copolymer is supplied in 25 kg sealed polyethylene-lined paper bags, ensuring safe handling and contamination-free storage. |
| Container Loading (20′ FCL) | Load 20′ FCL with MARPOL COPP 70.1.7 PP Copolymer; secure properly, segregate, and follow hazardous chemical loading regulations. |
| Shipping | MARPOL COPP 70.1.7 PP Copolymer is shipped as polypropylene copolymer resin pellets/granules. It is not regulated as dangerous goods under IMDG, ADR, or IATA, and it is not a marine pollutant. Use clean, dry containers or bulk bags; protect from moisture, heat, and ignition sources. SDS and product labeling accompany shipment. |
| Storage | Store MARPOL COPP 70.1.7 PP Copolymer in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep containers tightly closed when not in use to prevent contamination and moisture pickup. Protect from physical damage and store away from strong oxidizers, acids, and peroxides. Follow local regulations. |
| Shelf Life | Store in original sealed packaging, cool and dry. Shelf life is 12 months from date of manufacture. |
MARPOL COPP 70.1.7 PP copolymer is a heterophasic polypropylene impact copolymer in which an ethylene–propylene rubber phase is dispersed in a polypropylene homopolymer matrix. The downstream applications selected below reflect established industrial converting tracks where this class of impact copolymer is specified for low-temperature ductility, long-term thermo-oxidative resistance, fatigue tolerance, or food-contact conformity. For each application track, the compounding addition ratio, governing compliance standards, production-scale converting method, and finished article type are stated separately. Where published data for this specific supplier designation are limited, the stated ranges reflect class-typical industrial norms derived from ISO-type specimen data, converter process records, and equipment manufacturer technical bulletins.
In automotive interior structural carrier moulding, MARPOL COPP 70.1.7 PP copolymer is let down into a talc-filled injection moulding compound used on high clamp force presses of 2,000–3,200 t. The qualification protocol includes VDA 277 volatile organic compound emission limits, VDA 270 odour severity below grade 3, ISO 3795 horizontal burn rate below 100 mm/min, and IATF 16949 lot traceability for interior-sourced production parts. Formulation addition ratio: MARPOL COPP 70.1.7 PP copolymer 60–72 wt%, talc masterbatch with median particle size 2.5–4.5 µm at 18–26 wt%, ethylene–octene impact modifier at 5–12 wt%, and antioxidant plus acid scavenger package at 0.25–0.50 wt%. Downstream production process: the compound is twin-screw compounded on a co-rotating line with L/D 40:1, mineral side-fed at zone 6, screw speed 500–700 rpm, and specific mechanical energy 0.18–0.24 kWh/kg; subsequent injection moulding uses melt temperature 205–235 °C, mould wall temperature 25–45 °C, holding pressure 40–60 MPa, and sequential valve gating to prevent weld-line folding at map pockets. The dominant production-scale failure mode is differential shrinkage at boss edges after 24–48 h if packing time is below 1.0–1.5 s/mm of nominal wall; condensation on cold pellets at warehouse relative humidity above 70% causes splay, requiring 70–80 °C hopper drying for 1–2 h. Terminal finished product types: door panel carrier substrates, seat side shields, lower console substrates, and map pocket frames.
High-cadence injection moulding of thin-wall polypropylene lids imposes a melt-temperature ceiling to prevent organoleptic degradation, while the tool must be cooled sufficiently to meet cycle times below 6.5 s at wall stock 0.5–0.8 mm. Conformance is established through EU Regulation (EC) No 10/2011 Annex II overall migration limit 10 mg/dm², FDA 21 CFR 177.1520 olefin polymer identity and extraction limits, and EN 1186-1 migration test conditions for aqueous and acidic food simulants. The formulation for thin-wall lids is limited to MARPOL COPP 70.1.7 PP copolymer 93–97 wt%, clarifying/nucleating agent 0.12–0.25 wt%, glycerol monostearate antistatic 0.5–1.0 wt%, and slip/antiblock masterbatch 0.2–0.4 wt%. Downstream production process: the resin is processed on all-electric or accumulator-assisted injection machines of 280–500 t clamp force with hot-runner valve pins, melt temperature 230–250 °C, mould temperature 12–25 °C, injection speed 220–350 mm/s, holding pressure 25–40 MPa, and valve-pin hold time 0.5–1.2 s; flow-length-to-thickness ratio commonly exceeds 200:1, so the melt flow rate is specified on certificate of analysis in a class-typical range of 25–70 g/10 min at 230 °C/2.16 kg rather than inferred from general-purpose injection grades. Operational boundaries: melt temperature above 260 °C increases wash-out of slip agents and may produce off-taste failures in sensory screening; condensation on pellets stored below 10 °C and moved into a humid production hall causes splay, requiring 70–80 °C dehumidified air drying for 1–2 h above 60% RH. Terminal finished product types: thin-wall dairy cups, refrigerated salad tubs, reusable food storage containers, and tamper-evident lids with integral living hinges.
The outer tub of a front-loading or vertical-axis washing machine experiences repeated bending stress during spin cycles up to 1,200–1,600 rpm; stress concentrations form at bearing carrier insert boundaries, rib roots, and opposing hot-runner weld lines. The governing test framework includes IEC 60335-2-7 abnormal operation and durability requirements for washing machines, UL 746B relative thermal index for the stabilised formulation, ISO 179-1 Charpy impact at −20 °C and 23 °C, and ISO 527-2 tensile property verification after conditioning. The compound recipe is set at MARPOL COPP 70.1.7 PP copolymer 70–80 wt%, short-glass fibre 12–18 wt%, maleic anhydride–grafted polypropylene coupling agent 0.6–1.0 wt%, and long-term heat ageing stabiliser package 0.5–0.8 wt%. Downstream production process: the formulation is injection moulded on presses of 1,200–1,800 t clamp force using hot-runner valve gates, melt temperature 215–235 °C, mould temperature 40–65 °C, screw back pressure 3–6 bar, and post-gate hold pressure 50–75 MPa; the mould is heated at the bearing carrier insert to mitigate glass-fibre surface bloom. Weld-line location is shifted away from the bearing carrier ribs by adjusting valve-gate sequencing because glass fibre orientation at an opposing melt front creates a lower-toughness plane through the tub base. Operational boundaries: glass-fibre loading above 20 wt% produces measurable screw/check-ring abrasion and raises melt viscosity enough to risk short shots at the tub rim when wall stock is below 2.5 mm; bimetal barrels and L/D 20:1–24:1 reciprocating screws are standard on the production floor. Terminal finished product types: vertical-axis washing machine outer tubs, front-loader drum support housings, balance rings, and suspension rod sockets.
Returnable logistics crates in closed-loop automotive or agricultural distribution routes are exposed to stacked static loads in trailers where internal temperatures can reach 45–55 °C for prolonged periods; material selection is therefore driven by creep resistance and base flatness after repeated industrial washing. Compliance benchmarks are ISO 8611-1 flat pallet stacking tests, ISO 2234 complete filled transport packages resistance to compression and stacking, ASTM D2990 tensile/compressive creep and creep-rupture testing, and ISO 4892-2 xenon-arc weathering where outdoor exposure is specified. Recipe composition is constrained to MARPOL COPP 70.1.7 PP copolymer 82–90 wt%, ethylene–octene impact modifier 5–9 wt%, hindered-amine light stabiliser 0.3–0.5 wt%, carbon black masterbatch 1.5–2.0 wt%, and antacid/neutraliser 0.1–0.2 wt%. Downstream production process: the part is injection moulded on accumulator-assisted presses of 800–1,600 t clamp force, with melt temperature 200–220 °C, mould temperature 15–30 °C, screw cushion 5–10 mm, packing pressure 50–85 MPa, and cooling time 35–70 s for nominal wall stock 4.0–7.5 mm; thick-section sink marks are controlled by sequential packing and controlled gate freeze-off rather than by increasing melt temperature. Because high melt temperature increases cooling time and increases post-demoulding shrinkage after 48 h, converters maintain the lower end of the melt-temperature window and use a minimum packing time of 2–3 s/mm. If low-temperature impact below −10 °C is required, mineral filler is not loaded above 5 wt% because Charpy impact falls sharply at higher filler fractions. Terminal finished product types: collapsible beverage distribution crates, automotive returnable bulk containers, ventilated agricultural crates, and pallet-box sleeves with integral runners.
For exterior wheel arch liners and underbody shields, the formulation couples low-temperature impact retention with long ultraviolet ageing resistance; a field failure in these components is typically detected after stone impact at cold temperatures or after surface embrittlement following 1,500–2,000 kJ/m² xenon-arc exposure. The qualification protocol consists of SAE J2527 accelerated xenon-arc weathering, ASTM D256 Izod impact at −30 °C, ISO 179-1 Charpy impact at −30 °C, and ISO 4892-2 where general exterior plastics weathering is specified. The extruder and injection recipe splits as MARPOL COPP 70.1.7 PP copolymer 55–65 wt%, talc with median particle size 2.0–4.0 µm at 15–20 wt%, ethylene–octene impact modifier 12–18 wt%, carbon black masterbatch 2.0–2.5 wt%, and processing aid 0.3–0.5 wt%. Downstream production process: the compound is injection moulded on large presses of 2,500–3,500 t clamp force with sequential valve gating and melt temperature 200–240 °C; mould temperature is held at 25–45 °C to reduce tiger-stripe flow marks that emerge with high impact-modifier content; screw speed is limited to 60–90 rpm during recovery to prevent melt inhomogeneity. Production-scale failure modes include edge cracking at demoulding when the mould temperature falls below 15 °C, and gloss deviation when fill speed exceeds 120 mm/s at the gate. The material should not be blended with unpurified recycled talc sources containing residual metal oxides that accelerate surface oxidation. Terminal finished product types: wheel arch liners, underbody shields, rocker panel lower covers, and bumper lower deflectors.
Corrugated polypropylene drainage pipe manufacture subjects the melt to alternating shear across the moving corrugator blocks; wall thickness distribution around the corrugation valley determines ring stiffness consistency and resistance to buckling under traffic load. The conformity record is established through EN 13476-2 structured-wall polypropylene drain and sewer pipes, EN ISO 9969 ring stiffness determination for SN4 and SN8 classes, ISO 9080 long-term hydrostatic strength of thermoplastics pipe materials, and EN 14758-1 where stormwater infiltration is included. The formulation window is MARPOL COPP 70.1.7 PP copolymer 90–95 wt%, carbon black masterbatch 2.0–2.5 wt%, processing stabiliser 0.5–0.8 wt%, and calcium carbonate filler 0–5 wt% only when pipe mass reduction is permitted by the end-user specification; published data for this specific configuration is limited above 5 wt% filler. Downstream production process: the compound is first melt-homogenised on a corotating twin-screw extruder with L/D 44:1, then fed to a single-screw extruder with grooved bushing feed section, screw L/D 30–38:1, melt temperature 190–210 °C, and melt pressure before the die 120–180 bar; the parison enters a corrugator with mould block vacuum −0.3 to −0.5 bar and water cooling at 15–25 °C, with line speed 2.5–6.0 m/min depending diameter. Operational boundaries: melt temperature above 220 °C causes parison sag in large diameters and wall-thickness drift at the corrugation roots; calcium stearate above 0.3 wt% is avoided because it can plate out on calibration tooling and reduce vacuum efficiency. Terminal finished product types: buried gravity sewer laterals, stormwater drainage culverts, agricultural land-drain sleeves, and cable-protection ducts.
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MARPOL COPP 70.1.7 PP Copolymer is a high-flow heterophasic polypropylene impact copolymer formulated for injection moulding of thin-wall parts that require a balance of stiffness, dimensional reproducibility, and low-temperature impact retention. The grade designation places the melt mass-flow rate in the 70 g/10 min class when tested under ISO 1133-1:2022 at 230 °C with a 2.16 kg load. This places the material above standard impact-copolymer grades in fluidity and therefore alters filling pressure, gate-freeze time, and shear heating in multicavity tools. The designation COPP indicates a polypropylene matrix with a dispersed ethylene-propylene elastomer phase; this heterophasic morphology retains notched impact at -20 °C while preserving higher modulus than random copolymer grades. Melt volume-flow rate, derived from density, is approximately 77.3 cm³/10 min under the same conditions. Published producer technical data for this exact suffix remains limited; the numerical values presented in this document should be regarded as representative of the 70 g/10 min heterophasic PP impact copolymer class and verified against the lot-specific certificate of analysis.
The product is intended for injection moulded automotive interior retainers, caps and closures, thin-wall food-service packaging, appliance control panels, and filter housings. It is not designed for film extrusion, blow moulding, or sheet thermoforming because high melt flow reduces melt strength and may cause draw sag in vertical wall sections. In thin-wall parts below 1.0 mm, the grade’s high fluidity permits lower hydraulic pressure requirements and shorter fill time than a 12 g/10 min impact copolymer. However, this fluidity also reduces gate seal pressure and makes venting quality, clamp force, and speed profiling more influential. Dimensional control is therefore process-dependent; moulded parts require stable mould temperature and hold-pressure settings to avoid sink, flash, or warpage.
Melt temperature at the nozzle is stabilized within 230 °C to 260 °C. At the lower bound, the ethylene-propylene rubber domains remain well dispersed; below 220 °C, viscosity increases rapidly and weld lines become more pronounced. Above 260 °C, chain scission begins to shift the melt flow rate upward, and the impact phase can degrade, producing plate-out on core surfaces and loss of low-temperature ductility. In hot-runner systems with manifold zones above 270 °C, total residence time is limited to 2 min; otherwise, the notched Izod at -20 °C can fall below 3 kJ/m² in moulded parts. At wall thicknesses below 0.8 mm, the melt temperature processing window narrows to ±5 °C because a 5 °C drop increases viscosity sufficiently to create short shots in end-fill positions, while a 5 °C increase can delay gate freeze and create flash at mould protection edges. This threshold requires melt thermocouple verification and hot-runner zone balancing on production tools.
Pre-drying is not normally required for unopened packaging because polypropylene copolymers are non-hydrophilic. However, condensation at relative humidity above 60% or seasonal storage in unheated silos can introduce surface moisture. A desiccant dryer at 80 °C for 2 h to 4 h with a dew point of -20 °C is then applied before processing. General-purpose reciprocating screws with 20:1 to 22:1 L/D, compression ratio 2.5:1 to 3:1, and check rings with clearances verified to 0.02 mm to 0.04 mm are sufficient for dispersion. High-flow grades of this class do not require high-shear mixing sections; excessive screw speed above 0.3 m/s circumferential velocity may generate frictional heat that drives melt temperature above set point and reduces viscosity more than expected. In family tools, injection speed below 50 mm/s can produce hesitation marks because the high-flow melt preferentially fills thinner or hotter regions. Sequential valve-gate actuation or balanced runner layout is used to prevent cavity imbalance.
Mould temperature is controlled between 20 °C and 60 °C, with a preferred surface range of 30 °C to 50 °C to balance surface gloss, shrinkage, and impact retention. Below 20 °C, the melt freezes too rapidly for thin wall sections below 0.8 mm, and impact strength may fall; above 60 °C, cycle time increases without proportional gain in crystallinity because the elastomer phase remains above its glass transition but the PP matrix requires cooling below 120 °C to attain dimensional stability. Mould temperature variation of ±3 °C across the cavity can produce visible gloss differences on textured surfaces; therefore, turbulent flow in cooling channels and independent cavity thermocouples are applied on production tools.
Injection velocity is programmed as medium to high, with fill time of 0.3 s to 1.5 s depending on wall thickness and flow length. Hold pressure is typically 60% to 80% of the hydraulic fill pressure, and gate freeze time is established by part-weight versus hold-time curves rather than fixed rule. Shrinkage measured according to ISO 294-4:2018 is 1.0% to 1.4% for unannealed plaques, with lower values in parts with long fill paths and higher values in thick bosses. Post-mould shrinkage over 48 h is typically 0.1% to 0.3%; parts are not used for precision dimensions until post-crystallization is complete. Purging is performed with a high-flow PP homopolymer or a commercial polypropylene purge compound. Acetal, PVC, and halogenated flame-retardant grades are incompatible because decomposition products can produce acidic residues that corrode mould surfaces and catalyse PP degradation at processing temperatures.
Because the 70 g/10 min melt flow index shifts the viscosity curve downward, direct substitution of this grade into tools designed for lower-flow impact copolymers alters filling pressure, shear heating, and gate seal. On a 120-tonne injection moulding machine with a 22:1 L/D screw, filling pressure for a 1.0 mm wall part is typically reduced by 15% to 25% relative to a 12 g/10 min impact copolymer of equivalent ethylene content. This pressure reduction enables longer flow-length-to-wall-thickness ratios without increasing mould temperature; however, the lower melt viscosity also lowers gate seal force, so hold pressure must be separately optimized to prevent gate blush and sink. Batch-to-batch variation in MFR of ±5 g/10 min can shift fill pressure by 3% to 5% in thin-wall multicavity tools; injection moulders commonly monitor material arrival via cavity pressure transducers with alarm limits at ±10% of the process mean.
| Property | Test Method | MARPOL COPP 70.1.7 class | General-purpose impact copolymer MFR 12 | PP homopolymer MFR 25 |
|---|---|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 70 g/10 min | 12 g/10 min | 25 g/10 min |
| Density | ISO 1183-1:2019 | 0.905 g/cm³ | 0.905 g/cm³ | 0.900 g/cm³ |
| Tensile yield stress | ISO 527-2:2012 | 27 MPa | 26 MPa | 34 MPa |
| Elongation at break | ISO 527-2:2012 | >50% | >50% | 10% |
| Flexural modulus | ISO 178:2019 | 1300 MPa | 1250 MPa | 1500 MPa |
| Notched Izod at 23 °C | ISO 180/A:2000 | 6.0 kJ/m² | 8.0 kJ/m² | 2.5 kJ/m² |
| Notched Izod at -20 °C | ISO 180/A:2000 | 3.0 kJ/m² | 4.0 kJ/m² | 1.5 kJ/m² |
| Heat deflection temperature B, 0.45 MPa | ISO 75-2:2013 | 85 °C | 86 °C | 95 °C |
Compared with random copolymers of similar melt flow, the heterogeneous morphology gives higher flexural modulus and higher heat deflection, so the product is more suitable for structural side covers and brackets than for clear containers or stretch-blow bottles. Compared with PP homopolymer, the product trades tensile yield stress and surface hardness for impact toughness at low temperature; a 25 g/10 min homopolymer typically falls below 2 kJ/m² notched Izod at 23 °C, while the heterophasic class remains above 6 kJ/m² under the same method. The high-flow numeral in the grade designation also implies reduced melt strength; the product is therefore not suitable for extrusion blow moulding or thick-sheet processes where draw sag is critical. A 12 g/10 min impact copolymer of the same family would provide higher impact across weld lines but would require higher cavity pressure to fill complex thin-wall tools. In applications with living hinges, homopolymer grades or specifically rated impact copolymers are preferred because repeated flexural fatigue is not a primary design strength of this high-flow material.
Regulatory acceptance of this grade is documentation-dependent and must be confirmed for the specific lot, colorant, and conversion conditions. The following boundary conditions apply when food-contact, electrical enclosure, or consumer article compliance is required.
| Regulation | Reference | Boundary condition |
|---|---|---|
| EU RoHS direct material compliance | 2011/65/EU Annex II | Maximum 0.1 wt% lead, mercury, hexavalent chromium, PBB, PBDE; 0.01 wt% cadmium |
| REACH SVHC communication | Regulation (EC) 1907/2006 Article 33 | No intentionally added SVHC above 0.1 wt%; supply-chain declaration required |
| Olefin polymer food contact | FDA 21 CFR 177.1520 | End-use temperature, food type, and migration testing under 21 CFR 175.300 may apply; grade-specific letter of no objection required |
| Plastic materials intended for food contact | EU 10/2011 Annex II | Overall migration limit 10 mg/dm² for food contact; specific migration limits apply for additives |
| Electrical enclosure flammability | UL 94 HB or UL 94 V-2 | Rating depends on color, wall thickness, and additive package; must be evaluated per UL test program |
Processing under food-contact requirements requires the raw material to be handled in closed resin handling systems; regrind use is governed by the grade-specific compliance letter and is normally restricted to edge trim generated during the same process if authorized. For electrical appliance applications, relative thermal index and glow-wire performance are not generic, and published data for this exact product is limited; the part must be evaluated at the final wall thickness, color, and regrind level under IEC 60695-2-11 or UL 746B as specified by the end-use standard.
Keep the resin in closed original packaging below 50 °C and below 70% relative humidity. Protect from direct sunlight and prolonged exposure to open flame or hot surfaces. Avoid purging with PVC, acetal, or halogenated flame-retardant compounds; their decomposition products can corrode mould surfaces and generate acidic residues. Avoid melt temperatures above 270 °C for more than 3 min, and avoid blending with copper-containing additives at high loadings unless oxidative stability has been specifically tested. Repeated heat histories and high shear in incompatible hot-runner geometries may shift the nominal MFR and reduce low-temperature impact. Parts moulded from this grade are held for at least 24 h after demoulding before destructive testing because polypropylene crystallinity and impact properties develop during post-mould conditioning at 23 °C and 50% relative humidity under ISO 291:2008.
