Injection molding is the largest single application for polypropylene — and our deepest area of expertise. We supply a full grade slate covering six sub-applications: low-flow K8003 / 2500HW / EP300H for crates and automotive, high-flow EP548R for fast-cycle thin-wall, thin-wall specialists HP648T and M70, homopolymer HP500N for rigid housewares, transparent RP340R, and milk-tea-cup special M700B. Matched precisely to your mold and cycle.
Across the wide range of injection-molded parts, a few resin attributes consistently determine part quality, cycle time, and scrap rate. Here's what we look for when matching a grade to your mold.
MFR must match part geometry and wall thickness — too low and the cavity won't fill; too high and mechanical properties suffer.
Homopolymer for maximum rigidity; impact copolymer where drop resistance and toughness matter. The wrong choice causes field failures.
Consistent shrinkage and low warpage — controlled by MWD and copolymer structure — keep parts in tolerance across production runs.
Consistent base resin color and additive package ensure reproducible coloring and gloss, batch after batch.
Stable MFR and density from lot to lot prevent processing drift — the foundation of low scrap rates and high uptime.
Nine proven grades cover six injection-molding sub-applications — from rigid housewares to milk-tea cups. Click any grade with a product page for full TDS specifications; others are available on request with mill-direct pricing.
| Grade | Sub-Application | Type | MFR (g/10min) | Best For | Type |
|---|---|---|---|---|---|
| HP500N | Homopolymer Injection | Homopolymer | on request | Rigid housewares, containers, kitchenware, general-purpose molding | Leading Mill |
| K8003 | Low-Flow Injection | Impact Copolymer | on request | Crates, baskets, automotive interiors, large rigid parts | Leading Mill |
| 2500HW | Low-Flow Injection | Impact Copolymer | on request | Heavy-duty crates, appliance housings, returnable transport packaging | Leading Mill |
| EP300H → | Low-Flow Injection | Impact Copolymer | ~3-5 | Automotive interiors, washing machine tubs, large luggage, tool handles | Leading Mill |
| EP548R → | High-Flow Injection | Impact Copolymer | ~25-30 | Thin-wall food packaging, deli tubs, takeaway boxes, closures | Leading Mill |
| HP648T | Thin-Wall Injection | Impact Copolymer | on request | Ultra-thin-wall food containers, high-speed IML packaging | Leading Mill |
| M70 | Thin-Wall Injection | Impact Copolymer | on request | Thin-wall cups and boxes, microwaveable food packaging | Leading Mill |
| RP340R | Transparent Injection | Random Copolymer | on request | Clear containers, transparent housewares, medical and cosmetic parts | Leading Mill |
| M700B | Milk-Tea-Cup Special | Random Copolymer | on request | Bubble-tea cups, drink cups, transparent cup with high clarity and toughness | Leading Mill |
Not sure which fits? Tell us your part — we'll recommend the right grade with mill-direct pricing.
Six sub-applications — from rigid housewares to milk-tea cups — here's how our nine grades map to the parts you make.
Containers, cups, basins, kitchen utensils, storage items, and general rigid parts. Stiffness, surface gloss, and easy coloring are key.
Purpose-built homopolymer injection grade for rigid housewares — high stiffness, excellent surface finish, and easy color masterbatch uptake at competitive cost.
Returnable distribution crates, beverage trays, industrial totes, and waste bins. Drop resistance and stack strength under load.
A proven low-MFR impact copolymer tuned for thick-wall crates and totes — outstanding drop resistance and rigidity-toughness balance for repeated handling.
Higher-stiffness variant for returnable transport packaging and appliance housings that face stacked-load and impact in cold-chain distribution.
Catalog grade with full TDS for crates, baskets, and large rigid parts requiring proven impact performance.
Door trims, instrument panels, washing machine tubs, refrigerator liners, vacuum cleaner bodies. Impact, heat, and dimensional stability.
Outstanding low-temperature impact and rigidity-toughness balance. Tuned for large, load-bearing parts that face in-service impact and thermal cycling.
Equivalent impact performance for appliance housings and automotive interior trims requiring consistent lot-to-lot impact in cold climates.
Food containers, deli tubs, takeaway boxes, disposable tableware, IML packaging, and closures. High flow for thin walls and fast cycles, with food-contact compliance.
High flow fills thin-wall cavities fast while the impact copolymer structure preserves drop resistance. Food-contact compliant.
Engineered for high-speed IML lines producing ultra-thin-wall containers — exceptional flow with maintained impact for sub-0.4 mm walls.
Tuned for thin-wall cups and boxes that must withstand microwave reheating — heat-deflection temperature balanced with thin-wall flow.
Clear containers, transparent housewares, medical and cosmetic parts, and clear closures. Random copolymer for high clarity without brittleness.
A transparent PP random copolymer with balanced flow and clarity — replaces PS and SAN in many clear houseware and cosmetic applications, with better drop resistance and lower density.
Bubble-tea cups, drink cups, smoothie cups, and disposable beverage cups. The cup must combine high transparency with side-wall toughness and crack resistance.
A dedicated milk-tea-cup grade optimized for the bubble-tea cup process — exceptional clarity, low-stress cracking, and rigidity for cup stacking and sealing film.
PP processes easily on standard injection molding equipment. Use these ranges as a starting point; fine-tune to your specific mold geometry and cycle.
| Parameter | HP500N Homopolymer |
EP300H / K8003 Low-Flow Impact |
EP548R High-Flow Impact |
HP648T / M70 Thin-Wall |
|---|---|---|---|---|
| Melt Temperature | 180 – 220 °C | 190 – 230 °C | 200 – 230 °C | 210 – 240 °C |
| Mold Temperature | 20 – 50 °C | 30 – 60 °C | 20 – 50 °C | 15 – 40 °C (chilled) |
| Injection Pressure | 60 – 100 MPa | 70 – 110 MPa | 80 – 120 MPa | 100 – 140 MPa |
| Screw Speed | 40 – 80 rpm | 40 – 70 rpm | 80 – 150 rpm | 150 – 250 rpm |
Describe your part, your mold, and your cycle. Within 24 hours we'll recommend the best PP grade — with mill-direct pricing and current availability.