| HS Code | 430698 |
| Product Name | MARPOL COPP 50.3.0 PP Copolymer |
| Polymer Type | Polypropylene Copolymer |
| Density | 0.90 g/cm³ |
| Melt Flow Rate 230 C 2 16kg | 50 g/10min |
| Tensile Strength At Yield | 26 MPa |
| Elongation At Break | 45% |
| Flexural Modulus | 1200 MPa |
| Izod Impact Notched 23 C | 4.5 kJ/m² |
| Izod Impact Notched 20 C | 2.0 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 90°C |
| Vicat Softening Temperature | 150°C |
| Rockwell Hardness | R85 |
| Mold Shrinkage | 1.3% |
As an accredited MARPOL COPP 50.3.0 PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARPOL COPP 50.3.0 PP Copolymer is supplied in 25 kg multi-wall paper bags, palletized and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with MARPOL COPP 50.3.0 PP Copolymer, palletized bags secured, weight optimized for safe transport. |
| Shipping | MARPOL COPP 50.3.0 PP Copolymer ships as non-hazardous polypropylene pellets. Material should be transported in clean, dry containers or bulk hoppers, protected from moisture and direct sunlight. Maintain moderate temperatures to avoid softening. Secure packaging to prevent contamination. Keep away from ignition sources and incompatible oxidizers during transit. |
| Storage | Store MARPOL COPP 50.3.0 PP Copolymer 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 creating dust clouds; ground and bond equipment to prevent static discharge. Maintain moderate temperatures and follow local regulations for polymer storage. |
| Shelf Life | Shelf life is typically 2 years from date of manufacture when stored in original, unopened packaging in cool, dry conditions. |
Compounds based on MARPOL COPP 50.3.0 PP copolymer are used in pillar trims, centre consoles, door pockets and seat side shields where the unfilled copolymer is modified with 15 wt% to 25 wt% mineral or elastomer modifiers on a co-rotating twin-screw extruder with L/D ratio between 32:1 and 48:1. The compounding line uses side feeders for talc or calcium carbonate and downstream vacuum degassing to reduce volatile residuals. Starting melt temperature at the die plate is controlled at 200 °C to 220 °C to limit thermal degradation of the elastomer phase. Injection moulding of the compound uses barrel temperatures from 210 °C to 250 °C and mould wall temperatures from 20 °C to 40 °C; grain reproduction is retained when cavity pressure at the gate is held above 250 bar. Flexural modulus is measured by ISO 178 at 23 °C and after 1000 h heat ageing at 100 °C by ISO 188. Notched Charpy impact to ISO 179-1/1eA at -30 °C must be re-checked when paint adhesion promoters or flame-retardant packages are introduced because low-molecular-weight additives can plasticise the matrix-modifier interface. Odour and emissions are assessed by VDA 278 thermal desorption, with acceptance limits set by the tier-one specification rather than by the resin datasheet. REACH SVHC and European ELV Directive 2000/53/EC compliance is verified for each colour concentrate, not only for the base polymer. Free amine-based hindered amine light stabilisers should be separated from acidic processing aids during high-temperature compounding to avoid stabiliser antagonism and surface bloom after interior heat cycling.
Cycle-time reduction in washing machine top panels, vacuum cleaner cyclones and refrigerator trim parts is limited by differential shrinkage and ejection-force build-up in textured ribs, not by melt fluidity. When MARPOL COPP 50.3.0 PP copolymer is moulded at wall stocks from 0.8 mm to 1.5 mm, flow front velocity between 150 mm/s and 300 mm/s provides stable fill, but solidification time must be matched to the thickest rib intersection. Conformal cooling or high-turbulence water circuits are required because the copolymer releases heat slowly across rib roots; wall-thickness transitions above 1:3 create sink marks that become visible after painting or high-gloss lamination. Shrinkage is measured to ISO 294-4 on 60 mm × 60 mm plaques after 24 h and 48 h. Differential shrinkage between flow and transverse directions above 0.15% causes warpage on flat panels and is corrected by gate relocation rather than by increasing pack pressure alone. Ejection requires draft angles not less than 1.5° on textured surfaces and average ejection velocity below 40 mm/s to prevent hot-rib deformation. Heat deflection temperature is tested to ASTM D648 at 455 kPa and 1820 kPa as a ranking tool only, because PP copolymer creep cannot be inferred from single-point HDT. Contact with alkaline detergent solutions at 40 °C to 60 °C is generally acceptable, but hot oxidising agents and quaternary ammonium disinfectant concentrates may cause stress cracking at sharp corners. Chemical resistance validation follows ISO 22088-3 bent-strip environmental stress cracking with the actual service fluid and strain level representative of assembly fasteners.
| Conversion route | Critical processing window | Measurement standard | Purpose |
|---|---|---|---|
| Thin-wall injection moulding | Melt 225 °C to 255 °C; injection speed above 180 mm/s; mould 15 °C to 35 °C | ISO 1133-1:2022, ISO 294-4 | Flow validation and differential shrinkage control |
| Automotive interior injection moulding | Melt 210 °C to 250 °C; cavity pressure above 250 bar; mould 20 °C to 40 °C | ISO 178, ISO 179-1/1eA, VDA 278 | Stiffness, impact and emissions load control |
| Sheet extrusion and thermoforming | Die 210 °C to 230 °C; core sheet 160 °C to 180 °C; roll 40 °C to 70 °C | ISO 179-1/1eA, weld bend test at -10 °C | Sheet flatness and ductile weld verification |
| Compounding carrier resin | Screw speed 400 rpm to 900 rpm; specific energy 0.18 kWh/kg to 0.30 kWh/kg; die below 220 °C | ISO 4577, ISO 3451-1 | Dispersion quality and ash content verification |
In extruded sheet for industrial trays, reusable logistics boxes and dense-pack battery containers, MARPOL COPP 50.3.0 PP copolymer is thermoformed where chemical resistance and washability outweigh gloss or clarity. Sheet extrusion is run on a single-screw extruder with barrier screw, screen pack and melt pump; the die is set at 210 °C to 230 °C and the chill-roll stack is held at 40 °C to 70 °C depending on sheet thickness. The top and bottom polishing rolls are kept within 5 °C of each other to prevent curl. Thermoforming requires core sheet temperature between 160 °C and 180 °C; heating beyond 185 °C causes sagging and local thinning at plug-contact areas. Cut-sheet thermoforming of 3 mm to 8 mm thick sheet uses aluminium tools controlled at 80 °C to 90 °C. Weld corners are hot-plate or extrusion welded, and a bend test at -10 °C after 48 h conditioning verifies ductile fracture rather than brittle failure. In-house regrind can be introduced up to 20 wt% without melt-pump pressure instability if the flake is dried below 0.08 wt% moisture and bulk density after densification is above 450 kg/m³. Battery boxes formed from reinforced PP copolymer sheet are evaluated under UN ECE R100 for creep and impact behaviour, but published data for this specific MARPOL grade in that end use is limited, so converter-specific feasibility work is unavoidable.
As a high-flow carrier, MARPOL COPP 50.3.0 PP copolymer is processed on a co-rotating twin-screw extruder at screw speeds from 400 rpm to 900 rpm with specific energy input between 0.18 kWh/kg and 0.30 kWh/kg. The carrier is combined with 30 wt% to 60 wt% pigment, mineral filler or additive systems; the screw configuration uses two or three kneading blocks after the feed throat and a downstream side feeder for high-loading grades. Melt temperature at the die is kept below 220 °C because certain organic pigments and flame-retardant synergists degrade above 230 °C. Pelletization uses an underwater die-face cutter or strand pelletizer with a melt pump before the die to stabilise pellet diameter to ±0.2 mm. Dispersion quality is measured by screen pack pressure rise or filter pressure value according to ISO 4577. The MFR ratio between carrier and let-down resin must be checked on the actual tool; a carrier MFR above 50 g/10 min combined with a let-down PP below 8 g/10 min can produce visible flow lines in thin-wall articles. This is not a universal rejection criterion but must be validated on the actual hot-runner tool and let-down ratio. High-surface-area silica antiblocks can adsorb liquid antistatics, and brominated flame retardants plus antimony trioxide change melt rheology at high loadings. The final compound is tested for density by ISO 1183-1 and ash content by ISO 3451-1 to verify masterbatch concentration before downstream approval.
In fan shrouds, engine covers and battery trays, MARPOL COPP 50.3.0 PP copolymer is compounded with 20 wt% to 30 wt% short glass fibre and injection moulded where tensile modulus after conditioning at 80 °C and 95% relative humidity is a critical acceptance parameter. Fibre length retention is controlled by screw design: medium-shear screws with compression ratio between 2.0:1 and 2.5:1 are preferred over aggressive high-shear screws. Backpressure is limited to 30 bar to 50 bar during metering to avoid fibre attrition; nozzle melt temperature is held between 240 °C and 260 °C to wet out fibre bundles without degrading the PP matrix. Mould temperature between 60 °C and 80 °C improves fibre encapsulation and reduces exposed glass at the surface, but cooling time increases because the higher mould temperature slows solidification. Tensile properties are tested to ISO 527-2 on dry-as-moulded specimens, and fibre weight fraction is verified by ISO 3451-1 with 800 °C furnace ashing for 2 h. Notched Izod impact per ISO 180/A at 23 °C and -40 °C is evaluated before and after 1000 h ageing at 120 °C. Creep modulus data under ISO 899-1 at 80 °C are used for load-bearing under-bonnet design; single-point HDT is not sufficient. Rheological data for the glass-filled compound are collected by capillary rheometry to ISO 11443 at 230 °C, 250 °C and 270 °C because fibre orientation changes non-Newtonian behaviour relative to the unfilled copolymer. Published data for this specific MARPOL grade in long-term glass-fibre compound ageing is limited, so acceptance values must be generated by the compounder on the actual production extruder.
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In polypropylene conversion, selection of a reactor-grade impact copolymer requires separation of supplier commercial designations, lot-specific quality data, and class-level behavior. MARPOL COPP 50.3.0 PP Copolymer is a supplier-designated heterophasic polypropylene copolymer; the numeric suffix must be interpreted against the manufacturer certificate of analysis and should not be treated as a direct melt flow rate without verification. Published data for this specific configuration is limited. Consequently, numerical values supplied here are class-level ranges for unfilled reactor impact copolymer PP and are not grade-specific release limits.
The material is normally delivered as free-flowing pellets with a stabilizer package defined by the supplier. Incoming inspection should include melt flow rate determination in accordance with ISO 1133-1:2022 at 230°C and 2.16 kg, ash content by ISO 3451-1:2019, and density by ISO 1183-1:2019. Lot acceptance should be made against the supplier technical data sheet and quality certificate, not against the generic class ranges presented below.
The primary differentiation of an impact copolymer is the presence of a dispersed ethylene-propylene rubber phase in a continuous polypropylene matrix. This morphology increases low-temperature impact and stress-cracking resistance relative to homopolymer PP, while tensile yield stress and flexural modulus are generally lower than those of a homopolymer with an equivalent melt flow rate. Compared with random copolymer PP, the impact copolymer class typically shows lower clarity and gloss, higher haze, and a broader ductile-brittle transition envelope.
Impact-stiffness trade-off is not linear. At low ethylene content, stiffness remains close to homopolymer PP but the low-temperature impact gain is limited; at higher ethylene content, notched Izod impact at -20°C improves sharply while flexural modulus and tensile yield decline. Grade optimization for MARPOL COPP 50.3.0 therefore depends on the target balance between impact and flexural modulus, and the supplier should provide the specific ethylene content or rubber-phase level only if it is a controlled property.
| Property and test method | Homopolymer PP | Random copolymer PP | Impact copolymer class |
|---|---|---|---|
| Density, ISO 1183-1:2019 | 0.900–0.910 g/cm³ | 0.895–0.908 g/cm³ | 0.890–0.910 g/cm³ |
| Melt flow rate at 230°C/2.16 kg, ISO 1133-1:2022 | 0.5–100 g/10 min | 0.5–100 g/10 min | 1–100 g/10 min |
| Tensile yield stress, ISO 527-2:2012 | 30–38 MPa | 22–29 MPa | 20–30 MPa |
| Flexural modulus, ISO 178:2019 | 1200–1700 MPa | 800–1200 MPa | 800–1300 MPa |
| Notched Izod impact at 23°C, ISO 180/A | 2–5 kJ/m² | 5–12 kJ/m² | 10–50 kJ/m² or partial break |
| Notched Izod impact at -20°C, ISO 180/A | 1–2 kJ/m² | 2–4 kJ/m² | 3–10 kJ/m² |
The table is class-level and does not replace grade-specific values. For MARPOL COPP 50.3.0, the converter should request the supplier technical data sheet and certificate of analysis. When ASTM-based data are needed, ASTM D638-14 and ASTM D790-17 may be used, but results are not directly interchangeable with ISO data because specimen geometry and test speed differ.
Stress whitening is a visible energy-absorption mode in impact copolymers. Under instrumented puncture, the force-deflection curve often shows a wide ductile plateau before crack propagation. This differs from homopolymer PP, which may fail in a more brittle manner at low temperature or high strain rate. Where whitening is unacceptable, a lower ethylene content or a random copolymer may be specified. Rockwell hardness by ISO 2039-2:2000 for unfilled impact copolymers commonly falls in the range 70–90, while homopolymer PP may fall at 85–100. Vicat softening temperature by ISO 306/A50 is commonly 140–150°C for the impact copolymer class and 150–155°C for homopolymer PP. Heat deflection temperature under 0.45 MPa by ISO 75-2:2013 is commonly 90–100°C for unfilled impact copolymer PP.
Processability of PP impact copolymers is governed by single-point MFR and by the entire shear-viscosity curve. The melt flow rate obtained by ISO 1133-1:2022 at low shear cannot predict injection shear viscosity at gate velocities. Capillary rheometry at shear rates from 10² s⁻¹ to 10⁵ s⁻¹ and melt temperatures in the range 210–250°C is required for gate and pressure-drop calculations. If the supplier nomenclature for MARPOL COPP 50.3.0 associates the first digits with a nominal MFR of 50 g/10 min, the grade would be classified as high-flow and thin-wall capable; this interpretation must be confirmed from the certificate of analysis.
On reciprocating-screw injection molding machines with screw diameters of 25–80 mm and L/D ratios of 20:1–24:1, a barrel profile of 190°C, 210°C, 225°C, and 235°C at the nozzle is commonly used for impact copolymer PP. Back pressures from 3–10 bar (0.3–1.0 MPa) and screw decompression of 3–8 mm reduce drool and melt-air entrapment. Hot-runner manifold and nozzle temperatures should be controlled within ±5°C of the melt setpoint to prevent cold-slug flow marks and gate freeze-off.
Compounding operations on corotating twin-screw extruders with L/D ratios of 36:1–48:1 require separate consideration when MARPOL COPP 50.3.0 is used as a base resin for filled or reinforced compounds. Mineral filler or glass fiber is preferably added downstream of the melting zone to limit screw torque and melt-temperature rise. Vacuum venting at approximately -0.08 MPa is used to strip volatile degradation products. Filler incorporation can raise melt temperature by 10–30°C depending on screw speed, filler loading, and specific energy input; die melt temperature should be held below the supplier maximum.
Residence time at melt temperature should not exceed 5 min at 230°C; above 250°C, the maximum holding time should be shortened to 2 min because oxidative chain scission can shift viscosity and generate visible yellowing. Purging with a medium-flow homopolymer PP or high-density polyethylene is used for shutdown and color changes. Differential scanning calorimetry by ISO 11357-3:2018 typically records a crystalline melting peak in the range 160–168°C for PP copolymers; the exact peak is lot-dependent.
Thermoforming and extrusion blow molding require melt strength rather than high melt flow. If MARPOL COPP 50.3.0 is a high-flow grade, its melt strength may be lower than that of low-MFR impact copolymer grades. Sheet extrusion and thermoforming trials should evaluate sag, draw ratio stability, and part wall-thickness distribution. Published data for this specific configuration is limited.
Thin-wall filling of impact copolymers is not solely a function of melt flow rate. Flow-length-to-wall-thickness ratio, gate dimensions, vent depth, and mold temperature interact with the crystallization rate of the grade. For wall thicknesses between 0.5 mm and 1.2 mm, mold designs generally use chisel or fan gates with a land length of 0.4–0.8 mm and vent depths of 0.01–0.02 mm. Cavity pressure at transfer should be maintained above 300–500 bar (30–50 MPa) for packing, but actual pressure depends on part geometry and hot-runner pressure drop.
Required clamp force for thin-wall multi-cavity molds can be estimated at 3–6 kN/cm² of projected area for high-flow PP; this range is not grade-specific and must be validated with cavity-pressure sensors. A mold temperature in the range 20–60°C provides a balance between cycle time and part toughness. The higher end of the range improves weld-line impact but increases mold-open time and cooling demand.
Weld-line strength of impact copolymer PP can be 20–40% lower than the bulk tensile strength when two melt fronts meet at a cold junction. Increasing melt temperature within the supplier limit, using sequential valve-gate actuation, or repositioning the weld line to a low-stress area is preferred. For living-hinge applications, homopolymer PP is often preferred because impact copolymer grades may exhibit stress whitening and reduced hinge elastic recovery; prototype flex testing is required before conversion.
Post-mold shrinkage of unfilled impact copolymer PP is typically 1.0–2.0% in the flow direction and 1.2–2.0% transverse, measured by ISO 294-4:2018 on plaques molded to ISO 294-1:2017. Shrinkage differential drives warpage in thin-wall parts. Gate location, wall-thickness uniformity, and mold temperature uniformity commonly control bow and corner curl. Dimensional inspection should be performed after conditioning at 23°C ± 2°C and 50% ± 10% RH according to ISO 291:2008. If the product is nucleated or clarified, cycle time and shrinkage anisotropy may differ from non-nucleated impact copolymer PP; the supplier technical data sheet should state whether a nucleating agent is present.
In returnable crates, battery cases, appliance housings, caps and closures, and automotive interior trims, the key qualification chain includes instrumented impact at -20°C, short-term heat aging at 90–120°C, and emission testing. Automotive interior applications may require compliance with VDA 278:2011 for volatile organic compounds and fogging behavior and VDA 270:2018 for odor. These are application-specific and must be confirmed for MARPOL COPP 50.3.0, because the additive package and stabilizer concentration influence emissions. In exterior unpainted applications, ultraviolet exposure requires sufficient hindered amine light stabilizer content and carbon black or another UV stabilization system; long-term weathering should be evaluated by ISO 4892-2:2013 or natural Florida exposure, not by short-term oven aging alone.
Compared with post-reactor elastomer-modified compounds, reactor impact copolymer grades generally exhibit more uniform rubber-phase dispersion, lower gel counts, and better lot-to-lot consistency of the stiffness-impact balance. They may not reach the low-temperature impact of highly rubber-filled thermoplastic olefins. Compared with glass-fiber or mineral-filled PP, MARPOL COPP 50.3.0 would be expected to display lower modulus, lower density, and reduced cycle-time sensitivity, although the exact filled or unfilled status must be verified from the data sheet.
Food-contact compliance is not automatic. A polypropylene copolymer can be formulated to meet US FDA 21 CFR 177.1520(c) and the overall migration limit of 10 mg/dm² in European Regulation (EU) No 10/2011, but the supplier's written food-contact statement must be obtained. Electrical and electronic applications may require RoHS conformity under Directive 2011/65/EU and company-specific controlled-impurity lists. REACH duties fall under Regulation (EC) No 1907/2006, including Article 33 communication if a substance of very high concern is present above 0.1 wt%.
Uncontrolled additive admixture can destabilize the grade. The converter should avoid addition of copper-based stabilizers except as part of the supplier antioxidant package; uncontrolled introduction of certain metal ions can accelerate polypropylene oxidation. Strong oxidizing acids, hot chlorinated solvents, and long-term exposure to UV without sufficient hindered amine light stabilizers can reduce service life. Contamination with polyethylene lowers stiffness and may cause surface haze; contamination with PVC or polyacetal can generate corrosive degradation gases during processing.
The product should be stored in a dry, dust-free area below 40°C and protected from direct sunlight. Polypropylene is not hygroscopic, but condensation on cold pellet surfaces can occur when silo or bag temperature is below the dew point. If surface moisture is observed, pre-drying at 70–80°C for 2 h is normally sufficient. Lot shelf life should follow the supplier certificate; after long-term storage beyond the stated period, oxidative induction time measured according to ISO 11357-6:2018 should be rechecked before production release.
