| HS Code | 740935 |
| Density 23 C | 0.905 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 35.2 g/10 min |
| Tensile Strength At Yield | 30 MPa |
| Elongation At Yield | 12 % |
| Flexural Modulus | 1200 MPa |
| Izod Impact Strength Notched 23 C | 4.5 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 90 °C |
| Vicat Softening Point A 50 | 145 °C |
| Melting Point Dsc | 148 °C |
| Rockwell Hardness R Scale | 90 |
As an accredited MARPOL COPP 35.2 PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARPOL COPP 35.2 PP Copolymer is packaged in 25 kg multi-layer moisture-proof bags, palletized and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | Loaded in 20′ FCL container as packed bags, secured and braced to prevent shifting, ensuring safe transport of MARPOL COPP 35.2 PP Copolymer. |
| Shipping | MARPOL COPP 35.2 PP Copolymer is a chlorinated polypropylene copolymer supplied as a solid powder. It is not classified as dangerous goods under IMDG, ADR, or IATA—no UN number, hazard class, or packing group is required. Ship in sealed, durable packaging and declare as a non-hazardous polymer. |
| Storage | Store MARPOL COPP 35.2 PP Copolymer in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep the container tightly sealed and upright to prevent leakage or moisture absorption. Avoid contact with strong oxidizers and reactive chemicals. Use appropriate personal protective equipment and ensure secondary containment to manage spills. Maintain clear labeling and follow local regulations. |
| Shelf Life | Store in a cool, dry place away from direct sunlight. Shelf life is 24 months from date of manufacture. |
Thin-wall glove box supports, door panel map pocket backs, and lower B-pillar covers injection moulded from MARPOL COPP 35.2 PP copolymer are processed as either 100 wt% neat resin or as the continuous phase of a mineral-filled compound in which the copolymer matrix is 70–80 wt%, high aspect ratio talc is 15–25 wt%, and ethylene-octene elastomer is 5–10 wt%. The nominal melt mass-flow rate of 35.2 g/10 min at 230 °C and 2.16 kg load under ISO 1133-1:2022 places the grade in the medium-high flow class, but the practical processing window is narrower because the ethylene–propylene rubber domains in the copolymer reduce melt elasticity and can produce jetting if gate velocity exceeds 300 mm/s. On production lines using reciprocating-screw machines of 600–1,200 kN clamp force and screw L/D ratios of 20:1–24:1, melt temperature is held at 220–250 °C, mould temperature at 20–50 °C, hydraulic injection pressure at 70–110 MPa, and back pressure at 0.5–1.5 MPa to disperse talc and elastomer while preventing screw recovery override. Pre-drying is unnecessary for virgin MARPOL COPP 35.2 at ambient relative humidity below 60%; talc masterbatch should be dried for 2–4 h at 80 °C when relative humidity exceeds 60% to avoid surface silver streaks. Mould temperatures below 20 °C are outside the recommended window for grained interior surfaces because the ethylene–propylene rubber domains freeze before relaxation, producing visible gloss variation on textured surfaces assessed by ISO 2813 reflectometer readings. Flammability compliance for passenger compartment components is verified under FMVSS 302 maximum burn rate 100 mm/min and ISO 3795:1989/Amd 1:2020, while chemical compliance is declared under REACH (EC) No 1907/2006 and RoHS Directive 2011/65/EU including delegated directive (EU) 2015/863 phthalate restrictions. Terminal part geometries include glove box support frames, door panel map pocket lower shells, B-pillar covers with clip tower reinforcements, and seat side shields with living hinge elements.
The controlling processing parameter in thin-wall polypropylene container moulding is not the MFR alone but the pressure-limited flow-length ratio at a given wall thickness. For MARPOL COPP 35.2 PP copolymer, processors using hot-runner multi-cavity tools with 8–32 cavities and valve-gate diameters of 0.8–1.2 mm balance fill at a melt temperature of 235–250 °C and mould temperature of 8–20 °C, with injection velocity set at 200–400 mm/s and holding pressure at 50–70% of peak fill pressure to reduce gate stress whitening. Wall stock for dairy cups and deli lids ranges from 0.6–1.1 mm, giving cycle times of 6–11 s; cooling time is controlled by conformal cooling circuits in the core side and by a 2–4 wt% nucleating/clarifying masterbatch added to the virgin resin to increase crystallisation onset temperature and shorten part ejection. The pressure-limited flow-length ratio for a 0.8 mm wall at a practical filling pressure of 100 MPa is typically 130:1–180:1, so tooling with flow lengths beyond 180 mm requires sequential valve-gate opening or a second injection point. Food-contact compliance is verified under EU No 10/2011 with overall migration below 10 mg/dm² using EN 1186-1:2002 migration test methods and (EU) 2020/1245 test conditions, and under FDA 21 CFR §177.1520(c) olefin polymer provisions, with manufacturing hygiene under EC 2023/2006. Terminal products include polypropylene dairy cups, frozen dessert tubs, deli lids, and single-portion condiment trays.
For returnable beverage and logistics crates exposed to automated palletising and cold-room impact, MARPOL COPP 35.2 PP copolymer is processed at 220–250 °C melt temperature and 15–30 °C mould temperature on multi-nozzle hot-runner injection machines with 4–12 drop points; the resin is used either at 100 wt% virgin in thin-wall totes or as a 70–80 wt% matrix with 20–30 wt% recycled PP from closed-loop post-industrial crates. Load-bearing crate formulations add 10–20 wt% talc masterbatch to improve top-load resistance measured under ISO 12048:2000, while drop impact after preconditioning at −20 °C is evaluated by ASTM D5276 drop testing and ISO 179-1:2020 notched Charpy impact. Processing differs from thin-wall packaging in the use of sequential valve-gate opening to prevent weld-line splitting at handle apertures and the application of gas-counterpressure to reduce sink marks on ribbed sidewalls. Compliance is limited to general chemical and recycling directives: REACH (EC) No 1907/2006, RoHS Directive 2011/65/EU, and optional EU food-contact approval when used in direct food transport under EU No 10/2011 only if the chosen masterbatch also complies. Terminal products include returnable bottle crates, foldable storage totes, distribution trays, and ventilated agricultural crates.
Failure on production-scale washing machine tub lines is most commonly observed as stress cracking at the spider-arm bolt bosses and bearing seat threads after spin-cycle imbalance loading. MARPOL COPP 35.2 PP copolymer is used as the matrix in 75–85 wt% talc-filled compounds with 15–25 wt% compacted talc masterbatch and 2–4 wt% carbon black masterbatch for UV opacity; the compounded melt temperature is held at 230–260 °C in large reciprocating-screw machines with shot weights of 1.5–4.5 kg and clamp force starting at 12,000 kN depending on projected area, using mould temperatures of 30–60 °C to allow the ethylene-propylene rubber domains to relax through packing. Injection stage is run at 60–90 MPa fill pressure with a hold pressure of 50–80% of fill and a hold time of 10–20 s to reduce gate blush and sink opposite the bearing ring; residence time should not exceed 8 min at 240 °C to avoid thermo-oxidative chain scission detected as a loss of notched Charpy energy under ISO 179-1:2020. Compliance is evaluated under EN 60335-1:2012/A2:2019 for household appliance safety, glow-wire flammability under IEC 60695-2-11:2021 at 750 °C for unattended appliance insulation categories, and UL 94 HB or V-2 as specified by the end assembly; mechanical acceptance is checked using ISO 527-2:2012 tensile modulus, ISO 178:2019 flexural modulus, and ISO 179-1:2020 notched Charpy at 23 °C. Terminal products include outer tub bases, dryer drum baffles, dishwasher door inner panels, and removable agitator supports.
Continuous hinge flex testing on multi-cavity hot-runner tools for flip-top detergent caps reveals that a significant portion of hinge cracking is introduced not by polymer failure but by frozen-in shear orientation caused by excessive injection velocity through sub-1.0 mm hinge gates. MARPOL COPP 35.2 PP copolymer is processed at 235–260 °C melt temperature and 15–35 °C mould temperature on 24–96-cavity valve-gated hot-runner systems with injection velocity limited to 120–220 mm/s in the hinge region and hold pressure profiled down to 40–60% during the last 0.5 s of packing. The base resin is used at 90–100 wt%; when a softer hinge response is required, 5–10 wt% low-density polyethylene or ethylene-octene copolymer is dry-blended, and slip/antiblock additive masterbatch is added at 0.2–0.5 wt% to control closure torque. Notched impact behaviour is measured according to ISO 179-1:2020 at 23 °C; for cold-climate transport, Charpy notched at −20 °C under the same standard is recorded instead. There is no universal ISO flex-fatigue standard for polypropylene hinges, so processors commonly correlate 10,000 flex cycles at 23 °C with retained notched Charpy energy and tensile elongation after ageing under ISO 527-2:2012. Food-contact closures require migration testing under EU No 10/2011 with overall migration below 10 mg/dm² and FDA 21 CFR §177.1520(b) for olefin polymers. Terminal products include detergent flip-top caps, condiment spout caps, personal care flip caps, and wet-wipe canister lids. Published data for hinge fatigue specific to MARPOL COPP 35.2 is limited; processors should correlate in-house flex-cycle testing with the relevant OEM closure specification.
In twin-screw compounding lines, MARPOL COPP 35.2 PP copolymer is combined with 20–25 wt% talc and 0.5–1.5 wt% maleic anhydride-grafted PP coupling agent in a co-rotating twin-screw extruder with L/D ratio 40:1–48:1 and side-feed introduction at barrel 6–8 to minimise filler attrition. Barrel temperature profile is maintained from 180 °C at the feed throat to 230 °C at the die, screw speed is held at 300–600 rpm, and melt pressure before the screen changer is limited to 8–15 MPa; vacuum devolatilisation at −0.08 MPa removes low-volatility oligomers that would otherwise generate automotive interior emissions. The compounded pellets are evaluated under ISO 527-2:2012 for tensile yield stress, ISO 178:2019 for flexural modulus, ISO 179-1:2020 Charpy notched at 23 °C and −30 °C, and ISO 6603-2 instrumented puncture at 2.2 m/s to confirm ductile failure; thermal ageing is carried out by tensile testing under ISO 527-2:2012 after oven exposure at 110 °C for 1,000 h, following OEM-specific oven-ageing procedures, because no single universal ISO oven-ageing standard applies to all underbody applications. Chemical compliance for underbody applications is confirmed under REACH (EC) No 1907/2006 and RoHS Directive 2011/65/EU; flame retardancy is not required for wheel arch liners unless the component is within the engine bay, in which case UL 94 HB minimum applies. Terminal products include injection- or thermoformed wheel arch liners, underbody shields, engine splash covers, and rear bumper close-out panels. Published data for engine-bay thermal ageing of this specific grade is limited; pre-production validation under the OEM heat-shield test specification is required.
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MARPOL COPP 35.2 is supplied as a heterophasic ethylene-propylene polypropylene copolymer with a nominal melt mass-flow rate of 35 g/10 min when tested to ISO 1133-1:2022 at 230°C and 2.16 kg. The grade designation “COPP” identifies a copolymer backbone, while “35.2” corresponds to the melt-flow index target used for viscosity control in thin-wall injection moulding and high-speed packaging lines. The material is pelletised with an antioxidant package and acid scavenger, and it is intended for applications requiring a balance of impact resistance, moderate stiffness, and fast cavity filling. It is not a homopolymer, and it is not a random clarifier-grade copolymer; the heterophasic morphology contains discrete ethylene-propylene rubber domains dispersed in a polypropylene matrix. This microstructure raises low-temperature crack arrest relative to homopolymer PP while retaining higher heat deflection than many random copolymers. Because the grade is formulated for injection moulding, its molecular weight distribution is designed to minimise warpage after ejection while still supporting long flow paths in multi-cavity tools.
Flow-path capability is dominated by melt mass-flow rate, melt temperature, and injection pressure. With an ISO 1133-1:2022 MFR of 35.2 g/10 min, the grade is positioned above conventional medium-flow impact copolymers and below ultra-high-flow grades that sacrifice impact. In a 2 mm spiral-flow channel at 230°C melt temperature and 80 MPa hydraulic pressure, high-flow heterophasic copolymers in this class commonly exhibit flow paths in the 700 mm to 1000 mm range; published data for this specific MARPOL configuration is limited, so converter trials should be used for gate and runner sizing. The advantage of this flow class appears in wall sections between 1.0 mm and 2.5 mm, where pressure drop remains low enough to prevent short shots without excessive clamp force. Multi-cavity hot-runner tools with valve-gate sequencing benefit from the low pressure demand but require minimum gate land temperatures above 210°C to prevent freeze-off at high shear rates. Thin-wall containers, battery cases, and appliance panels are typical conversion routes.
Before melt processing, moisture uptake must be checked when containers have been open for more than 48 h at relative humidity above 60%. Pellets may be pre-dried in a dehumidified-air hopper dryer at 80°C for 2 h; vacuum drying at 75°C to 85°C for 3 h is also used where available. Injection moulding barrel temperature profiles from feed to nozzle are typically set at 190°C, 210°C, 220°C, 230°C, and 235°C, with melt temperature measured directly at 220°C to 240°C. A three-zone general-purpose screw with an L/D ratio of 20:1 to 24:1 and a compression ratio of 2.0:1 to 2.5:1 is sufficient; for faster recovery, a barrier screw with a mixing section reduces unmelted core at screw speeds above 150 rpm. Mould temperature is usually maintained at 20°C to 50°C for dimensional stability; higher mould temperatures up to 60°C improve weld-line strength and reduce orientation but extend cooling time. Hot-runner manifold temperatures should not exceed 240°C, and melt residence time above 230°C should be limited to 8 min or less. Long residence times increase oxidative chain scission, visible as an upward drift in MFR and a loss of notched impact. The hot-runner manifold temperature window is narrow: setpoints below 220°C cause valve-gate sticking and incomplete filling in thin sections; above 245°C increases MFR drift and yellowing. A ±5°C control tolerance across manifold zones is recommended.
When regrind fractions above 15 wt% are re-introduced into virgin MARPOL COPP 35.2, the melt mass-flow rate may shift upward by 2 g/10 min to 5 g/10 min after three heat histories, depending on sprue/runner contamination, pellet drying, and barrel residence time. This drift is a field indicator of chain scission in the polypropylene matrix and must not be ignored in tight-tolerance parts. A production line running a 300-ton hydraulic press with hot-runner manifold at 235°C has shown consistent mould fill at 20 wt% regrind for flat battery cases, but weld-line impact at -20°C dropped below the virgin benchmark when regrind from painted or heavily pigmented sprues was included. No new stabiliser masterbatch should be added without checking interactions with the existing acid-scavenger package. For load-bearing thin-wall parts, lot-to-lot verification should include ISO 1133-1:2022 MFR, ISO 179-1:2010 notched Charpy at 23°C and -20°C, and a 1 h ash test. Fines below 500 µm should be held below 2% of regrind weight to prevent feeding instability and localised degradation. Published data for the specific MARPOL COPP 35.2 regrind response is limited; converters should maintain a run chart from their own regrind loops.
Test specimens injection-moulded according to ISO 294-1 and conditioned for 40 h at 23°C and 50% relative humidity provide the baseline values listed in Table 1. The tensile and flexural data correspond to a moderate-stiffness impact copolymer with rapid cavity filling; flexural modulus is lower than a 35 g/10 min homopolymer by approximately 250 MPa to 350 MPa, while low-temperature impact is substantially higher. Values are representative of the heterophasic copolymer class and should be confirmed against the current manufacturer certificate of analysis.
| Property | Method | Value |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 35.2 g/10 min |
| Density | ISO 1183-1:2019 | 0.900 g/cm³ |
| Tensile yield stress | ISO 527-2:2012 | 25 MPa |
| Nominal tensile strain at break | ISO 527-2:2012 | 60% |
| Flexural modulus | ISO 178:2019 | 1,100 MPa |
| Notched Charpy impact, 23°C | ISO 179-1:2010 | 7 kJ/m² |
| Notched Charpy impact, -20°C | ISO 179-1:2010 | 4 kJ/m² |
| Heat deflection temperature, 0.45 MPa | ISO 75-2:2013 | 88°C |
| Vicat softening temperature, A50 | ISO 306:2013 | 150°C |
Compared with a high-flow PP homopolymer of equivalent 35 g/10 min MFR, MARPOL COPP 35.2 shows higher notched impact at -20°C, lower flexural modulus, and reduced shrinkage anisotropy in flat parts. Compared with a random copolymer of similar MFR, the heterophasic grade retains lower optical transparency but provides better creep resistance at elevated temperature. These differences occur because the ethylene-rich rubber phase absorbs impact energy while reducing crystallinity; homopolymer PP has a higher crystalline fraction and therefore higher stiffness and lower low-temperature toughness. Table 2 summarises the directional differences using representative values from standardised laboratory data. The comparative values are not a substitute for actual grade certificates.
| Property | Method | MARPOL COPP 35.2 | PP Homopolymer 35 MFR | Random PP 25 MFR |
|---|---|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 35.2 g/10 min | 35 g/10 min | 25 g/10 min |
| Flexural modulus | ISO 178:2019 | 1,100 MPa | 1,450 MPa | 950 MPa |
| Notched Charpy impact, 23°C | ISO 179-1:2010 | 7 kJ/m² | 3 kJ/m² | 5 kJ/m² |
| Notched Charpy impact, -20°C | ISO 179-1:2010 | 4 kJ/m² | 1.5 kJ/m² | 2 kJ/m² |
| Heat deflection temperature, 0.45 MPa | ISO 75-2:2013 | 88°C | 100°C | 80°C |
| Haze on 2 mm plaque | ASTM D1003-21 | 82% | 70% | 16% |
Air ageing at 150°C in a fan-driven circulating oven produces oxidative consumption of the stabiliser package before thermo-mechanical embrittlement is visible in the flexural modulus. Notched Charpy impact at 23°C is a more sensitive indicator of degradation than tensile yield stress; a decrease of more than 30% after 500 h indicates that the antioxidant boundary has been reached. The material is not rated for continuous under-hood service above 110°C without additional validation. For short-term hot-fill or dishwasher applications, parts with 2 mm wall thickness have shown dimensional stability up to 95°C under 0.45 MPa load, but long-term exposure to polar detergent solutions at pH above 10 should be evaluated using environmental stress-cracking methods. The typical use window includes automotive interior trims, appliance housings, battery cases, thin-wall packaging containers, and office automation covers. Conversion routes include injection moulding and masterbatch let-down operations where shear uniformity is maintained.
Storage and handling boundaries must include protection from prolonged UV exposure; unstabilised or lightly stabilised shipments should be stored indoors and away from direct sunlight. The material is not recommended for continuous contact with strong oxidising acids at temperatures above 60°C, aromatic hydrocarbons, or chlorinated solvents at elevated temperatures. Regulatory compliance is grade-specific: converters must verify food-contact status under FDA 21 CFR 177.1520 and EU Regulation 10/2011, as well as REACH Annex XVII and RoHS 2011/65/EU Annex II limits for cadmium, lead, mercury, hexavalent chromium, PBB, and PBDE. No intentionally added per- and polyfluoroalkyl substances are used in this grade’s polymerisation and finishing line, but the manufacturer should provide current SVHC documentation for REACH Article 33 declarations below 0.1% w/w. Avoid combination with copper-based pigments at melt temperatures above 240°C due to catalytic oxidation. Pre-drying is required when internal moisture exceeds 0.05 wt% or when ambient relative humidity remains above 60% for unsealed storage beyond 48 h.
