| HS Code | 505513 |
| Product Name | Moplen EP548U PP Copolymer |
| Resin Type | Polypropylene impact copolymer |
| Density | 0.905 g/cm³ |
| Melt Flow Rate | 30 g/10 min at 230°C and 2.16 kg |
| Melt Volume Rate | 30 cm³/10 min at 230°C and 2.16 kg |
| Melting Temperature | 165 °C |
| Tensile Stress At Yield | 24 MPa |
| Tensile Strain At Yield | 8 % |
| Flexural Modulus | 1100 MPa |
| Charpy Impact Notched 23c | 20 kJ/m² |
| Charpy Impact Notched Minus20c | 5 kJ/m² |
| Ball Indentation Hardness | 55 MPa |
| Heat Deflection Temperature 0 45mpa | 85 °C |
| Vicat Softening Temperature A50 | 145 °C |
As an accredited Moplen EP548U PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Moplen EP548U PP Copolymer supplied in 25 kg woven polypropylene bags with inner liner, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL loaded with Moplen EP548U PP Copolymer in 25 kg bags on pallets, about 20 metric tons per container. |
| Shipping | Moplen EP548U PP Copolymer ships as non-hazardous polypropylene pellets in sealed bags, octabins, or bulk rail/hopper trucks. Protect from moisture, direct sunlight, and extreme heat. Store in a cool, dry, ventilated area. No special transport classification is required under standard regulations. Handle gently to avoid bag damage and contamination. |
| Storage | Store Moplen EP548U PP Copolymer in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture contamination and dust accumulation. Avoid contact with strong oxidizers. Under proper conditions, shelf life is practically unlimited. Ensure good housekeeping to minimize dust and static hazards. |
| Shelf Life | Moplen EP548U PP Copolymer has an indefinite shelf life when stored in original, dry, cool conditions away from sunlight. |
When low-temperature ductility must survive grain-axis alignment in automotive door panel lower substrates, Moplen EP548U is processed without drying unless pellets are transferred from outdoor silos into a warm production hall at RH > 60%; in that case, pre-drying at 80 °C for 2 h is applied. The formulation for grained, low-gloss interior trims includes 2.5–4.0 wt% of a pre-dried color or metallic masterbatch, 0.10–0.25 wt% of a hindered phenolic/phosphite antioxidant package, and 0.05–0.10 wt% calcium stearate. Mineral addition is held below 1.2 wt% where grain replication fidelity is specified by the OEM. Processing on a 4-cavity valve-gated hot-runner tool with clamp force of 4,500–6,000 kN uses melt temperatures of 200–230 °C, mold temperatures of 20–40 °C, injection speeds of 45–70 mm/s, holding pressures of 55–70 MPa, and back pressure of 0.5–1.5 MPa. Terminal components include lower door panel carriers, map pocket shells, and speaker grille frames. Compliance is documented under FMVSS 302 with burn rate below 100 mm/min and under ISO 3795:1989 where tests are required outside North America. Molders report that weld lines at boss-to-substrate junctions become visible when melt temperature exceeds 235 °C because local degradation lowers surface gloss before mean pellet residence time exceeds 180 s. The grade is not formulated for painted Class-A surfaces unless adhesion promotion is validated on the selected lot; published data for this specific configuration is limited.
In collapsible Euro containers and agricultural harvest crates, impact failure at gate-weld intersections rather than bulk flexural yield determines service life. The formulation for crate producers uses neat Moplen EP548U with 2.0–5.0 wt% color masterbatch and 0.10–0.20 wt% of a hindered amine light stabilizer where UV exposure occurs. For cold-store service at -20 °C, 15–25 wt% of a metallocene ethylene-octene impact modifier masterbatch is introduced at the throat of a 40:1 L/D twin-screw extruder; this addition lowers flexural modulus by 8–15% while shifting the ductile failure boundary. The injection molding process uses melt temperatures of 210–245 °C, mold temperatures of 10–30 °C, fill speeds of 25–40 mm/s, and holding pressure of 45–60 MPa. Because wall stocks range from 3.5–6.0 mm, holding time must continue until gate freeze; pressure transducer decay at the gate confirms seal when cavity pressure falls below 15 MPa. Opening before gate seal produces microcracks in the hinge area during first cold-cycle loading. Terminal products include stackable produce crates, perforated bakery trays, and folding bulk containers. Compliance follows the general provisions of EU 10/2011 when used for food-contact logistics, with migration testing on the final article required; REACH 1907/2006/EC SVHC screening is documented for heavy-metal content. Service experience shows that impact retention at the gate area falls below 3 kJ/m² under ISO 180:2023 at -20 °C when pellet regrind exceeds 20 wt%. Avoid purging with PVC, polyacetal, or nylon at melt temperatures above 240 °C due to corrosive degradation byproducts.
| Configuration | Melt temperature | Mold temperature | Fill speed | Holding pressure |
|---|---|---|---|---|
| Automotive door lower substrate | 200–230 °C | 20–40 °C | 45–70 mm/s | 55–70 MPa |
| Returnable logistics container | 210–245 °C | 10–30 °C | 25–40 mm/s | 45–60 MPa |
| Appliance structural housing | 200–240 °C | 30–50 °C | 35–50 mm/s | 50–65 MPa |
| Power tool housing | 200–250 °C | 20–40 °C | 50–80 mm/s | 60–80 MPa |
Washing machine top-panel frames and drum base supports impose a performance boundary where neat impact copolymer can be selected only when IEC 60335-1:2020 Clause 30.2.3 permits glow-wire severity of 550–650 °C and where UL 94 HB is acceptable; applications requiring V-0 at 1.5 mm require halogen-free flame-retardant compound and fall outside the neat grade boundary. The formulation for non-flame-retardant structural housings uses 5–10 wt% of a 1.5 μm median talc masterbatch to raise flexural modulus by 200–400 MPa while retaining weld-line integrity. An additional 0.15–0.30 wt% of a long-term heat-stabilizer package is used because continuous exposure to 60 °C detergent-laden air accelerates oxidative embrittlement. Injection molding of large flat surfaces uses sequential valve-gate control on a 5–8 drop hot runner; melt temperature is held at 200–240 °C, mold temperature at 30–50 °C, fill speed at 35–50 mm/s, and holding pressure at 50–65 MPa. Terminal components include washing machine drawer fronts, detergent dispenser housings, and pump service covers. Molders observe that weld lines shift toward the vent side when switchover position is set later than 95% of cushion stroke, causing dimensional variation in snap-fit bosses. The grade is not recommended for continuous exposure to steam above 90 °C or for direct contact with concentrated oxidizer cleaning chemicals.
In cordless power tool pistol-grip housings and battery pack lower shells, drop impact after cold conditioning at -10 °C controls material selection. The formulation uses 2.0–4.0 wt% pre-dried color masterbatch; for outdoor tools, 0.20–0.50 wt% UV/HALS stabilizer masterbatch is added, and 5–10 wt% ethylene-octene impact modifier masterbatch is incorporated only when drop requirements exceed 1.0 m under IEC 60068-2-31:2008. Processing on thin-wall tools of 2.0–3.5 mm wall stock uses melt temperatures of 200–250 °C, mold temperatures of 20–40 °C, injection speeds of 50–80 mm/s, and holding pressures of 60–80 MPa. Terminal products include drill motor housings, hedge trimmer rear handles, and battery pack lower shells. Compliance is assessed under IEC 62841-1:2014 for mechanical hazard and temperature rise. Ejection-related stress whitening around battery clip bosses appears when mold temperature falls below 20 °C or hold pressure is released before gate seal. Where battery pack shells require UL 94 V-0, the neat grade is not suitable without flame-retardant modification.
Stackable chair shells and stadium seat backs demand long flow paths without chemical blowing agents. The formulation for UV-stable furniture uses 1.5–3.0 wt% of a HALS-based UV masterbatch and 0.20–0.40 wt% of a hindered phenolic/phosphite antioxidant package; where surface scratch resistance is specified, 5–10 wt% of a 1.0–1.5 μm talc masterbatch is added, raising flexural modulus and reducing after-molding shrinkage to 0.8–1.2% when measured by ISO 294-4:2018. Processing on a large-part injection molding machine with clamp force above 8,000 kN uses sequential valve gating. Melt temperature is set at 200–235 °C, mold temperature at 15–35 °C, injection speed at 40–60 mm/s, and holding pressure at 45–60 MPa. A melt cushion of 4–6 mm is maintained because cushion loss below 4 mm produces sink marks around the gate boss, while cushion above 6 mm increases residence time and initiates gloss variation. After ejection, parts are stored on forming templates for 24 h at 20 ± 2 °C before dimensional audit; checking earlier captures transient thermal shrinkage and can reject acceptable parts. Terminal products include stackable chair shells, stadium bleacher seats, and auditorium seats. Compliance follows EN 16139:2013 static and dynamic load requirements for contract seating; outdoor applications additionally require ISO 4892-2 weathering validation. Published data for this specific configuration is limited concerning long-term creep after 1,000 h at 40 °C; physical aging studies on the production tool are recommended.
| Application field | Standard or regulation | Test / clause | Typical acceptance criterion |
|---|---|---|---|
| Automotive interior trim | FMVSS 302 | Burn rate | < 100 mm/min |
| Returnable food-contact logistics | EU 10/2011 | Overall migration | < 10 mg/dm² |
| Appliance housings | IEC 60335-1:2020 | Clause 30.2.3 | glow-wire 550–650 °C no ignition |
| Power tools | IEC 62841-1:2014 | Mechanical / thermal clauses | no hazardous deformation |
| Furniture seating | EN 16139:2013 | Static / dynamic load | no fracture |
Because migration of oligomers rises with melt residence time and hot-runner stagnation, thin-wall storage pails and hinged lids demand a narrow processing window. The formulation for food-contact injection molding uses only pre-approved color masterbatches at 2.0–4.0 wt% and 0.05–0.10 wt% calcium stearate as an acid scavenger; slip- or antistatic additive packages are excluded unless covered by a compliant masterbatch certificate. Processing on high-speed thin-wall injection machines with flow-length-to-wall-thickness ratios up to 150:1 is performed at melt temperatures of 200–240 °C, mold temperatures of 20–40 °C, injection speeds of 60–90 mm/s, and holding pressures of 55–75 MPa. Terminal products include 1–5 L storage pails, reusable food container bases, and hinged lunchbox lids. Compliance is verified on the final article under EU 10/2011 overall migration testing with a limit of 10 mg/dm² and under FDA 21 CFR 177.1520 for polypropylene copolymer use. Hot-runner temperatures above 250 °C or residence times exceeding 180 s increase oligomer content and are to be avoided. The grade is not suitable for retort sterilization above 121 °C or for long-term hot fill above 90 °C without migration testing.
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Designated as a reactor-grade heterophasic polypropylene impact copolymer, Moplen EP548U PP Copolymer is supplied by LyondellBasell with an integrated UV-stabilizer package and is positioned for injection moulding of outdoor and technical articles. The published melt flow rate is 25 g/10 min when measured at 230 °C under 2.16 kg piston load according to ISO 1133-1:2022; the published density is 0.900 g/cm³ according to ISO 1183-1:2019. The “EP” designation identifies an ethylene-propylene impact copolymer in which a continuous polypropylene matrix contains a dispersed ethylene-propylene rubber phase. That rubber phase lowers the ductile-to-brittle transition relative to homopolymer polypropylene but reduces tensile modulus and optical clarity. Manufacturer technical literature cites applications including garden furniture, toys, crates, and thin-wall technical housings. The grade is differentiated from homopolymer grades by lower stiffness and higher subambient impact; from random copolymers by lower transparency and higher impact; and from lower-flow impact copolymers by its flow length at the same injection pressure. Published data for the exact rubber-phase particle-size distribution in this specific commercial grade is limited; however, reactor-grade production controls the ethylene content and phase dispersion before pelletisation.
Published technical literature focuses on injection moulding. Extrusion processes requiring high melt strength, such as blown film, pipe extrusion, or large-part sheet extrusion, are not typical for this 25 g/10 min melt-flow class. Rotational moulding is also not specified because the grade is supplied in pellet form for screw plastication.
Processing of Moplen EP548U on reciprocating-screw injection machines with screw L/D ratios between 18:1 and 24:1 is conducted at melt-temperature setpoints of 200 °C to 240 °C. The lower bound is set by incomplete thin-wall filling; the upper bound is constrained by thermo-oxidative chain scission. Residence time above 260 °C can shift the melt flow rate upward and reduce weld-line strength. Mould surface temperatures are maintained between 20 °C and 50 °C; higher mould temperatures reduce frozen-in orientation but increase cycle time and can raise differential shrinkage between thick and thin sections. Pre-drying at 80 °C for 2–4 h in a desiccant dryer is recommended when ambient humidity exceeds 60 % RH or when surface condensation is possible. The material is not hydrolytically sensitive in the manner of polyamide, but residual moisture volatilises during plastication and can produce splay on the part surface. Injection pressure is normally established by short-shot studies; values of 70–120 MPa are representative for thin-wall tools. Packing pressure should remain above 60 % of peak injection pressure to limit sink marks. Back pressure between 0.5 MPa and 2.0 MPa prevents screw-slip and excessive shear heating. Shot size should be between 20 % and 80 % of barrel capacity to limit residence time and melt-temperature variability. Clamp force should be calculated from projected cavity area; a guide of 3–5 kN/cm² is used for semicrystalline polypropylene. Specimen preparation for mechanical testing follows ISO 294-1:2017 and ISO 1873-2:2007; moulding shrinkage determinations follow ISO 294-4:2018. Published shrinkage values for this specific formulation are limited, although linear mould shrinkage for commercial impact copolymers in this melt-flow class commonly falls between 1.0 % and 1.5 % depending on wall thickness and packing time.
High-speed filling of thin-wall tools benefits from the 25 g/10 min melt-flow rate, but the same flowability reduces the pressure required to open the parting line. Multicavity tools with poor parting-line maintenance may exhibit flash if clamp force is inadequate. Hot-runner manifold temperatures are maintained in the melt-temperature window, and open-gate designs are preferred over small edge gates when weld-line impact retention is critical. Gate shear rates should be kept below 100,000 s⁻¹ to avoid melt fracture; capillary rheometry according to ISO 11443:2021 is used for gate pressure-drop calculations. If hot-runner residence time exceeds 15 min, the melt should be purged because antioxidant depletion accelerates. Nozzle-tip design should include a positive shut-off; cold-slug wells are required ahead of the gate to capture the more crystalline skin formed in the nozzle tip.
Typical physical, mechanical, and thermal values from the manufacturer’s technical data sheet are shown below. These values are typical values, not specification limits, and should be used only for initial design comparisons. Batch-to-batch variation and test-specimen history can shift values within the reproducibility of the corresponding ISO methods.
| Property | Typical value | Method and conditions |
|---|---|---|
| Melt flow rate | 25 g/10 min | ISO 1133-1:2022, 230 °C, 2.16 kg |
| Density | 0.900 g/cm³ | ISO 1183-1:2019, 23 °C |
| Tensile stress at yield | 23 MPa | ISO 527-2:2012, 50 mm/min |
| Tensile strain at yield | 6 % | ISO 527-2:2012, 50 mm/min |
| Tensile modulus | 1000 MPa | ISO 527-2:2012, 1 mm/min |
| Charpy notched impact strength, 23 °C | 8 kJ/m² | ISO 179-1:2023, Type 1, edgewise |
| Charpy notched impact strength, -20 °C | 3.5 kJ/m² | ISO 179-1:2023, Type 1, edgewise |
| Heat deflection temperature, 0.45 MPa | 80 °C | ISO 75-2:2013, Method B |
| Vicat softening temperature, A50 | 150 °C | ISO 306:2022, 10 N, 50 °C/h |
The Charpy notched impact data illustrate the performance boundary of the heterophasic structure. At 23 °C, the value is approximately 8 kJ/m²; at -20 °C it falls to approximately 3.5 kJ/m². The reduction, approximately 56 %, corresponds to the approach of the ethylene-propylene rubber phase to its glass transition. Components with snap-fit arms, latch features, or living hinges should not be subjected to high-speed flexure below 0 °C unless prototype testing under ISO 6603-2 confirms ductile puncture behaviour. Living hinges should be oriented across the flow direction; hinge endurance should be validated by repeated flexural cycling at the service angle and temperature because no single ISO method fully captures polypropylene hinge fatigue. The tensile stress at yield of 23 MPa and tensile modulus of 1000 MPa indicate a moderate stiffness level; load-bearing parts should use creep modulus measured according to ISO 899-1:2017, not short-term tensile data, when calculating deflection over service life.
Compared with a 25 g/10 min homopolymer polypropylene, Moplen EP548U exhibits lower tensile stress at yield and lower stiffness because the dispersed rubber phase interrupts crystalline order. The benefit is a higher resistance to brittle crack initiation at room temperature and subzero conditions; a homopolymer of similar melt flow typically has notched Charpy values below 3 kJ/m² at 23 °C. The random copolymer, by contrast, incorporates ethylene statistically along the polypropylene chain, reducing crystallite size, melting temperature, and haze. Random copolymers may provide better optical clarity but lower heat-deflection temperature and often lower creep resistance. A heterophasic impact copolymer such as EP548U is therefore selected when optical transparency is sacrificed in favour of impact strength and when the part must tolerate handling abuse rather than continuous high-load deformation.
Compared with lower-flow impact copolymers with MFR 10–15 g/10 min, EP548U fills thin-wall cavities at lower pressure and may tolerate longer flow lengths. Weld-line impact strength, however, is often lower because high-flow orientation and rapid cooling leave fewer load-bearing entanglements at the weld plane. Compared with higher-flow impact copolymers above 40 g/10 min, EP548U generally offers a better impact–flow balance but may require slightly higher injection pressure for long flow paths. Published data for the exact weld-line strength hierarchy of this specific commercial grade is limited; therefore tool trials should include short-shot and weld-line impact studies on specimens cut from production mouldings according to ISO 179-1:2023.
Colour concentrate addition should use polypropylene-compatible carrier resins. Inorganic pigment loadings above 2 wt% can nucleate the polypropylene matrix, shift crystallisation temperature, alter shrinkage, and reduce impact if agglomerates are present. Because the grade is already UV-stabilised, final weathering response depends on pigment lightfastness and the screening effect of the pigment. Published weathering data for specific pigment combinations with Moplen EP548U is limited; accelerated weathering should follow ISO 4892-2:2013, Method A, with xenon-arc exposure at 0.51 W/(m²·nm) and 340 nm, black-standard temperature 65 °C, and a spray cycle. The stabilizer package retards photo-oxidative chain scission but does not prevent chalking of degraded inorganic coatings or fading of organic pigments.
Chemical resistance under stress is similar to polypropylene homopolymer in acids and alkalis, but the rubber phase improves slow crack growth resistance in detergent solutions. Contact with strong oxidising acids, halogenated solvents, aromatic hydrocarbons, and high-octane motor fuels at elevated temperature should be avoided. Immersion testing should follow ISO 175:2010 or ASTM D543-21, with post-exposure tensile and impact retention measured according to the same ISO methods used for initial characterisation.
Because the U suffix denotes UV stabilization, Moplen EP548U is used for outdoor seating, gardening equipment, and other injection-moulded articles exposed to direct sunlight. The stabilizer system inhibits photo-oxidation, but all polypropylene weathers by surface crazing and gloss loss before bulk mechanical failure. For outdoor approval, parts should be tested under ISO 4892-2:2013 or ASTM G155-21 with target performance criteria for colour change, gloss retention, and notched impact retention. Published data for this specific grade under 5,000 h of xenon-arc exposure is limited; product-specific testing is required because pigment, wall thickness, and mould-surface texturing change weathering results. Avoid direct contact with copper alloys, copper-naphthenate wood preservatives, and high concentrations of transition-metal ions, because these catalyse hydroperoxide decomposition and shorten UV service life.
For indirect food-contact applications, the public datasheet does not establish compliance; verification under Regulation (EU) No 10/2011 or FDA 21 CFR 177.1520 should be performed for the finished article. Under REACH Regulation (EC) No 1907/2006, SVHC content above 0.1 % w/w should be confirmed through the manufacturer’s supply-chain statement. RoHS Directive 2011/65/EU compliance applies only to electrical and electronic equipment applications, not to all moulded goods.
Long-term thermal stability follows Arrhenius behaviour. Continuous air-oven aging above 90 °C is not recommended without added antioxidant, because the reactor-grade stabilization is optimised for melt processing and UV exposure, not prolonged elevated-temperature service. Heat-aging failures initially appear as surface discoloration and gloss loss, followed by embrittlement and a sharp drop in notched impact. Air-oven testing should follow ISO 4577 or the relevant product specification. For load-bearing outdoor furniture, creep and UV aging are combined in qualification programmes because weathering can accelerate creep failure at stress concentrations.
