| HS Code | 859809 |
| Density | 0.900 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 8.0 g/10 min |
| Tensile Stress At Yield | 26.0 MPa |
| Tensile Strain At Yield | 8.0 % |
| Flexural Modulus | 1200 MPa |
| Charpy Notched Impact Strength 23 C | 45.0 kJ/m² |
| Charpy Notched Impact Strength 20 C | 8.0 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 90.0 °C |
| Heat Deflection Temperature 1 80 Mpa | 55.0 °C |
| Vicat Softening Temperature A50 | 150.0 °C |
| Melting Temperature | 165.0 °C |
As an accredited Moplen EP548S PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg multiwall paper bags, palletized, shrink-wrapped, with batch identification for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL of Moplen EP548S PP Copolymer, shrink-wrapped on pallets, securely loaded and blocked to ensure safe transport. |
| Shipping | Moplen EP548S PP Copolymer is supplied as free-flowing pellets in sealed bags, suitable for standard dry cargo transport. It is non-hazardous under normal conditions. Keep packaging intact, store away from direct sunlight, moisture, and extreme heat to preserve material quality during shipment. |
| Storage | Store Moplen EP548S PP Copolymer in a cool, dry, well-ventilated area, away from direct sunlight, heat, and open flames. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid generating dust; maintain good housekeeping. Protect from oxidizing agents and strong acids. No special storage temperature required, but ambient conditions are recommended. |
| Shelf Life | Shelf life is 10 years when stored in dry, cool conditions, protected from sunlight and moisture. |
At nominal wall thickness of 1.6 mm to 2.2 mm for door lower trim carriers and seat side garnish, the typical melt flow rate of Moplen EP548S PP Copolymer (44 g/10 min under ISO 1133-1:2022 at 230°C/2.16 kg) permits flow-length-to-thickness ratios above 180:1 without exceeding hydraulic pressure set-points on 800–1000 kN toggle injection moulding machines. The injection speed window is constrained by jetting at velocities below 40 mm/s and by gate blush above 180 mm/s for hot-tip gate diameters of 1.0–1.2 mm. Processors using sequential valve-gate systems typically profile fill velocities of 120–160 mm/s to maintain a melt-front velocity between 250 mm/s and 350 mm/s at 220–240°C. The freeze-off limit becomes critical below 195°C, where the crystallisation half-time shortens under shear and the skin layer occupies 8–12% of the wall before the pressure-holding phase begins. Tooling with conformal cooling at 30°C and holding pressure of 35–45 MPa is one route to sink mark control; published production data for this specific configuration is limited, but sink mark depth below 0.02 mm on ribbed bosses is the normal acceptance criterion. Flame-spread performance is evaluated according to FMVSS 302 or ISO 3795; fogging values below 2.0 mg in DIN 75201:2011-11 method B typically require monomer stripping and low-volatile masterbatch dilutions. Hot stamping above 160°C should be avoided because surface whitening appears at impact-modifier domains.
Washing machine outer tubs and dishwasher tank liners impose a combined duty of warm detergent exposure, unbalanced dynamic load, and long-cycle creep. Moplen EP548S PP Copolymer is processed on 1000–1300 kN injection moulding machines with solid shot sizes of 1.2–2.8 kg; barrel temperatures are set at 215–235°C, and hot runner manifolds are balanced to ±3°C to limit part-to-part mass deviation below 0.4%. In service, bearing loads of 8–12 kg at spin speeds of 1200–1400 rpm and water temperatures of 60–95°C shift the design criterion from short-term tensile yield to creep modulus retention under ISO 899-2:2003 at 80°C and 1.5 MPa. Detergent cracking is assessed under ISO 22088-3:2006 bent-strip environmental stress cracking with a 1.0% nonylphenol-free surfactant solution at 60°C; published data for this specific configuration is limited, but no surface fracture is expected below 0.5% external strain if moulded-in stress is relieved by holding pressures not exceeding 45 MPa. Pre-drying is generally unnecessary for sealed production feed systems. If pellets are stored in unheated silos with RH above 60% or regrind above 10% is introduced, tray drying at 80°C for 2 h prevents splay. Direct contact with hypochlorite concentrations above 200 ppm at 60°C should be avoided because oxidative degradation accelerates at the ethylene-propylene rubber domains and causes brittle failure at gate bosses.
High-flow impact copolymers can exhibit lower environmental stress-crack resistance in closure applications if the comonomer distribution is too narrow or the nucleating package is overdosed. For Moplen EP548S PP Copolymer in injection-moulded paint pail lids with outer diameters of 200–300 mm and sealing-bead thicknesses of 0.9–1.4 mm, the governing failure mode is not short-term burst but creep of the sealing bead after 48 h of clamping at 3.0–5.0 N·m closure torque. The specification is usually based on ASTM D2463-15 drop impact or ASTM D1693-15 environmental stress-crack resistance; for gasket-sealed lids, the more useful test is compression set retention measured by a load-relaxation jig at 40°C. Mould temperature is set at 30–40°C to prevent post-demoulding shrinkage from pulling the bead out of round; seal roundness is held within 0.3 mm total indicated runout on a rotary check fixture. The melt flow rate of 44 g/10 min under ISO 1133-1:2022 allows filling of eight-cavity stack tools with cold runner turns without exceeding 90 MPa injection pressure, but the fast-crystallising front can create a weak knit line at the bridge-gate intersection if the melt front temperature drops below 210°C. For this reason, sequential valve-gate tools are preferred in high-volume production. Published data for this specific configuration is limited, but torque retention above 70% after 7 days at 40°C is achievable when the sealing bead is thickened by 0.2 mm at the gate area.
Industrial battery container ribbing and the cold-impact plateau are linked through part geometry rather than resin selection alone. When Moplen EP548S PP Copolymer is used for 12 V automotive battery containers with wall thicknesses of 2.0–3.5 mm, the forming process uses 1200–1600 kN injection moulding machines, screw L/D ratios of 20:1 to 22:1, and back pressures of 0.5–1.5 MPa to homogenise carbon black masterbatch at 2.0–3.0 wt%. The critical design limitation is the drop-impact requirement at −20°C. ASTM D3763-18 instrumented puncture tests on flat plaques produce brittle failures if the distance between vertical ribs exceeds 10 times the wall thickness. Rib spacing is therefore set at 30–45 mm for 3.0 mm walls to maintain local rigidity without creating a stress concentration at the rib root. Sulphuric acid resistance is assessed by immersion in 30% H2SO4 at 60°C for 7 days following ISO 175:2010; no mass change above 0.5% or surface cracking is considered acceptable. Stacking loads up to 2.5 tonnes on logistics crates require creep modulus evaluation under ISO 899-2:2003 at 40°C and 2.0 MPa, with side-wall deflection limited to 2.0 mm after 1000 h. Weld lines at the central gusset are moved away from the acid-reservoir corner; published data for this specific configuration is limited, but shifting the gate to the end wall merges melt fronts above 220°C and improves ISO 179-1:2020 Charpy notched performance at −20°C.
Dishwasher lower spray arms, detergent dispenser housings, and filter bowls made from Moplen EP548S PP Copolymer operate in a fluctuating aqueous environment where alkalinity, oxidising species, and temperature are coupled. The polypropylene matrix is not susceptible to alkaline hydrolysis, but the ethylene-propylene rubber domains are vulnerable to oxidative degradation if sodium hypochlorite is dosed above 200 ppm and water temperature exceeds 70°C. Stress-crack resistance is evaluated under ISO 22088-3:2006 using 1.0% sodium hydroxide at 60°C on a constant-strain bent strip; cracks initiating at weld lines below 0.4% external strain indicate excessive pack pressure or late gate freeze. Moulded parts should be annealed for 15 min at 80°C when wall thickness exceeds 2.0 mm to reduce residual hoop stress. The design weak point is the spray-arm bearing bore, where cylindrical interference fits and thermal expansion produce hoop stress of 2.5–4.0 MPa; a minimum boss wall of 2.2 mm is required to avoid stress whitening after 500 cycles in a 55°C rinse programme. Published data for this specific configuration is limited, but no change in ISO 180:2023 Izod notched impact should occur after 1000 h immersion in 0.1% sodium hypochlorite at 40°C.
Moplen EP548S PP Copolymer is evaluated for food-contact use under EU 10/2011 and FDA 21 CFR 177.1520 within specific temperature and extractive conditions. Overall migration is normally measured in 3% acetic acid, 10% ethanol, and olive-oil substitute 95% ethanol for 10 days at 40°C, with a limit of 10 mg/dm² under EN 1186-1:2002. Because the grade is a heterophasic copolymer, the ethylene-propylene rubber domains have a different migration profile from the homopolymer matrix; low-molecular-weight paraffinic fractions can migrate above 60°C, so long-term repeated-use approval is typically limited to 70°C under EU conditions. For appliance use, glow-wire flammability under IEC 60695-2-11 is relevant for unattended appliance housings carrying current-carrying parts; the test severity at 550°C or 750°C is determined by end-product insulation and current ratings in the IEC 60335-1 series. The boundary matrix below summarises the main compliance routes.
| Application scope | Standard designation | Test method / condition | Acceptance criterion |
|---|---|---|---|
| Food contact EU | EU 10/2011 | Overall migration EN 1186-1:2002; simulants 3% acetic acid, 10% ethanol, 95% ethanol; 10 days at 40°C | ≤ 10 mg/dm² |
| Food contact US | FDA 21 CFR 177.1520 | Extraction with n-hexane and xylene per subpart 177.1520(c) | Olefin polymer specification; no transfer of unsafe substances |
| Automotive interior | FMVSS 302 / ISO 3795 | Horizontal burn rate on 100 mm × 356 mm specimens | ≤ 100 mm/min or self-extinguishing before interval |
| Appliance flammability | IEC 60695-2-11 | Glow-wire at 550°C or 750°C for 30 s; tissue ignition monitored | Flame extinguished ≤ 2 s; no tissue ignition |
| Long-term heat ageing | UL 746B | Oven ageing at multiple temperatures; property retention to 50% | Relative thermal index assigned per thickness category |
Competitive Moplen EP548S PP Copolymer prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618136850665 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618136850665
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Moplen EP548S is a heterophasic polypropylene impact copolymer produced by LyondellBasell for injection molding operations that require a defined balance of melt flow, stiffness, and room-temperature toughness. The grade designation includes a nominal melt flow rate of 48 g/10 min measured at 230°C under 2.16 kg load in accordance with ISO 1133-1:2022. The polymer consists of a polypropylene homopolymer matrix with a dispersed ethylene-propylene rubber phase. This morphology separates the product from random copolymers, in which ethylene is incorporated along the propylene chain, and from homopolymers, which lack a discrete impact-modifying rubber phase. The practical consequence is that the melt fills thin sections and multi-cavity tools at lower injection pressure than medium-flow impact copolymers, while the rubber phase gives higher notched impact resistance than a homopolymer with a comparable melt flow index. The material is supplied as free-flowing pellets and is typically used in thin-walled packaging, pails, appliance housings, automotive interior components, and luggage shells.
The typical tensile modulus is 1500 MPa measured at 1 mm/min under ISO 527-2:2012. The typical Charpy notched impact strength at 23°C is 8.0 kJ/m², and at −20°C the value is approximately 3.0 kJ/m² under ISO 179-1/1eA. Density is typically 0.900 g/cm³ under ISO 1183-1:2019. These values are typical lot averages rather than contractual specification limits. For safety-critical parts, the lot-specific certificate of analysis must govern acceptance testing.
The product occupies an intermediate performance band within polypropylene portfolios. A homopolymer with a comparable melt flow rate and tensile modulus above 1800 MPa will normally have a Charpy notched impact value below 3.0 kJ/m² at 23°C. A low-flow impact copolymer with a melt flow rate below 12 g/10 min can provide higher low-temperature toughness, but it demands elevated fill pressure and longer cooling time in thin-wall tooling. Moplen EP548S combines a higher melt flow rate with sufficient impact resistance for packaging and appliance parts that must survive room-temperature dropping or low-speed impact events.
| Property | Test condition | Unit | Moplen EP548S typical | Homopolymer PP at comparable flow | Low-flow impact copolymer |
|---|---|---|---|---|---|
| Melt flow rate | 230°C, 2.16 kg | g/10 min | 48 | 45–50 | 4–12 |
| Tensile modulus | ISO 527-2:2012, 1 mm/min | MPa | 1500 | 1800–2000 | 1100–1400 |
| Charpy notched impact at 23°C | ISO 179-1/1eA | kJ/m² | 8.0 | 2.0–3.0 | 15–25 |
| Charpy notched impact at −20°C | ISO 179-1/1eA | kJ/m² | 3.0 | 1.0–1.5 | 6–9 |
| Heat deflection temperature, 0.45 MPa | ISO 75-2/B | °C | 105 | 110–115 | 95–105 |
All values in the table are typical values from publicly available manufacturer technical literature and represent general positioning, not contractual release specifications. Relative to a random copolymer, Moplen EP548S has higher opacity and haze, higher tensile modulus, and higher heat deflection temperature. It is selected where see-through clarity is not required and where the combined load-bearing and impact performance of a heterophasic system is needed. The grade is not an elastomer-modified engineering resin; it is a polypropylene copolymer and remains subject to semicrystalline shrinkage, limited high-temperature service, and the combustion characteristics of polyolefins.
On production-scale injection molding lines, the grade is processed at barrel temperatures between 210°C and 250°C, with the feed zone maintained below 50°C to prevent pellet bridging. A general-purpose polyolefin barrier screw with an L/D ratio between 20:1 and 25:1 and a compression ratio of 2.5:1 is typical. Mold temperatures from 20°C to 50°C are commonly used. Lower mold temperatures shorten cycle time but may increase flow marks and reduce surface gloss. Higher mold temperatures improve gloss and dimensional stability but extend cooling time. In multi-cavity hot-runner tools, balanced runner architecture is necessary because residence-time differences across the manifold can create gate-to-gate melt temperature variation, yellowing, or gate stringing. Production experience indicates that the practical process window narrows when wall thickness drops below 1.0 mm; holding pressure, gate diameter, and injection velocity must then be validated by mold-filling simulation and short-shot studies rather than set from general-purpose polypropylene data.
Although polypropylene is not hygroscopic, pellets stored in outdoor silos can carry surface condensation. If splay or surface streaks appear, hopper drying at 70–80°C for 1–2 h is used. Melt temperatures above 280°C or residence times beyond 10 min can cause chain scission. The resulting increase in melt flow rate and loss of Charpy impact strength are not recoverable by reprocessing. Gate design is critical for thin-wall parts; gate diameters below 1.0 mm can generate high shear that locally heats the melt and may damage the ethylene-propylene rubber phase, reducing impact performance in the gate region.
The melt flow rate value is a single-point viscosity index under constant load. It does not replace full shear-viscosity characterization. For mold-filling simulation, capillary rheometry under ISO 11443:2021 is required; published Cross-model parameters for this specific grade are limited. The decrease in melt viscosity from lower-flow polypropylene grades to a 48 g/10 min material is significant at injection molding shear rates, which is why the product is suited to thin-wall packaging and high-cavitation tooling. However, this flow advantage is accompanied by lower melt strength than a low-flow grade, meaning that parison extrusion, blow molding, and thick-section foaming are not the intended conversion processes.
The grade is classified as a nucleated impact copolymer. The nucleating system raises the crystallization temperature and produces a finer spherulitic morphology than a non-nucleated impact copolymer. Differential scanning calorimetry under ISO 11357-3:2018 can quantify the shift in crystallization exotherm. The processing consequence is a reduced solidification time in the mold and improved dimensional repeatability. Mold shrinkage typically falls between 0.9% and 1.5% depending on wall thickness, flow direction, and residual stress. Tool design should therefore use prototype measurements under ISO 294-4:2018 instead of applying a single linear shrinkage coefficient. Post-mold annealing at 80–100°C for 30 min in an air-circulating oven can reduce residual orientation and improve dimensional stability, but it may also lower low-temperature impact by relaxing oriented rubber-phase domains. Published data for this specific annealing configuration in Moplen EP548S is limited, so production validation on actual parts is required before specifying this treatment.
Weld lines represent a discontinuity in the rubber phase and should not be placed in regions subject to high local tensile stress or impact loading. Bulk Charpy data do not characterize weld-line strength. For parts with multiple gates or openings, instrumented puncture testing under ISO 6603-2:2000 is a more realistic method for comparing weld-line and bulk fracture behavior. The cracking resistance of pigmented versions may differ from natural resin because color masterbatches can act as additional nucleants and modify shrinkage, fracture, and long-term heat stability.
For clean non-food technical parts, clean in-house regrind can be introduced at up to 20 wt% without automatically invalidating typical processing parameters, provided the regrind is dry and not thermally degraded. At regrind levels above 30 wt%, melt flow rate may shift upward due to chain scission, and the material should be retested under ISO 1133-1:2022. For food-contact parts, the use of regrind must comply with the relevant regulatory framework; post-consumer regrind is not generally acceptable in food-contact packaging unless the specific national or EU provision permits it and migration testing confirms compliance.
Moplen EP548S is commonly supplied with general food-contact declarations based on EU Regulation (EC) No 10/2011 and FDA 21 CFR 177.1520 for olefin polymers. These references are not unconditional certifications. The final part must be tested for overall migration and specific migration of additives using the appropriate simulants and time-temperature conditions defined in the legislation. If color masterbatch, antistatic additive, or processing aid is added, the food-contact status must be re-evaluated because the additive package and its degradation products are part of the final plastic article. A commercial compliance statement from the resin supplier for the natural pellet does not automatically cover a colored, filled, or regrind-containing finished part.
The −20°C Charpy notched impact value of approximately 3.0 kJ/m² is adequate for short-term low-temperature transport of many packaging items, but it is not sufficient for severe subzero structural loads or high-speed impact. If the part is expected to survive drop tests at deep-freeze temperatures below −30°C, a lower-flow impact copolymer or an elastomer-modified grade with a higher documented subzero impact may be required. For parts with weld lines, knock-out pin locations, or sharp corners, the effective low-temperature toughness can be substantially lower than the bulk Charpy value indicates. Molded-in stress from excessive packing pressure or fast ejection further reduces frost-crack resistance in cold-chain service.
The base polymer is not UV-stabilized. Prolonged outdoor exposure without ultraviolet stabilizer masterbatch can lead to surface chalking, embrittlement, and loss of impact within an exposure period that depends on climate and part thickness. For outdoor applications, accelerated weathering under ISO 4892-2:2013 should be used to compare formulated versions, because natural grade data cannot predict the service life of a colored UV-stabilized article. In service, the product is not recommended for continuous contact with aromatic solvents, chlorinated hydrocarbons, or strong oxidizing acids at elevated temperature. These chemicals swell or oxidize the ethylene-propylene rubber phase and can produce surface cracking and premature impact loss. Polypropylene is also combustible; unfilled polypropylene is generally classified as UL 94 HB at 1.5 mm thickness, but the specific rating for a colored or compounded version must be confirmed from the manufacturer’s Yellow Card. Electrical applications require additional characterization such as comparative tracking index under IEC 60112 and glow-wire ignition behavior under IEC 60695-2.
For dust-sensitive electronic packaging or appliance parts, the nucleation of the product does not automatically provide electrostatic-discharge protection. If a measurable surface resistivity below 1010 Ω/square is required, an antistatic additive or post-treatment must be validated under the relevant test method. The product is not intended for medical implant or pharmaceutical applications without additional validation. Under normal handling, the pellets are not classified as a hazardous substance, but the safety data sheet should be consulted for occupational exposure limits, thermal decomposition products, and firefighting measures during melt processing.
