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PP vs PE for Injection Molding and How to Select Right Masterbatch
- May 29, 2026
PP (Polypropylene) and PE (Polyethylene) are two of the most widely used general-purpose plastics for injection molding. They share many similarities in processing and application, but their physical properties, heat resistance, toughness and surface performance are different. Choosing the right resin is the first step to qualified finished products, while selecting a matched color masterbatch is important in stable coloring, production efficiency and final product quality.
Key Differences Between PP and PE for Injection Molding
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PP
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PE
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PP features excellent heat resistance. Its continuous service temperature can reach 100°C to 120°C, and it is safe for microwave heating. It will not deform or soften under common high-temperature conditions.
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PE, including HDPE, LDPE and LLDPE, has poor heat resistance. The maximum long-term service temperature is around 60°C. It is prone to softening and deformation when exposed to high heat, and is never suitable for microwave use.
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PP is rigid and stiff with good structural stability. When bent or tapped, it makes a crisp sound. It maintains good shape retention after injection molding.
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HDPE is tough and flexible, while LDPE is softer and more elastic. PE products feel waxy to the touch and produce a dull sound when folded. They have outstanding low-temperature resistance and will not become brittle even at minus tens of degrees Celsius.
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The standard processing temperature of PP for injection ranges from 200°C to 280°C, which is relatively high.
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PE runs at a lower processing temperature, generally between 160°C and 230°C. This difference is critical for the heat resistance requirement of color masterbatch.
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Common PP products present a semi-matte surface; transparent PP can achieve high clarity. Due to higher melt viscosity, PP is more likely to generate color specks, streaks and uneven coloring if the pigment dispersibility is poor.
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PE has better melt fluidity. Pigments disperse more easily in PE resin, so it is less likely to produce visual defects. However, soft-grade PE products have a higher risk of additive and pigment precipitation.
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How to Select the Right Color Masterbatch for PP and PE
The carrier resin of color masterbatch determines its compatibility with base plastic.Â
PP masterbatch must use PP carrier, and PE masterbatch must use PE carrier. Mixing different carrier masterbatches will lead to poor dispersion, color spots, peeling and unstable production. Follow the below rules for selection:
Color Masterbatch for PP Injection Products
Select PP carrier masterbatch as the priority, which achieves perfect compatibility with PP resin.
Since PP is processed at high temperature, choose masterbatch with good thermal stability and high-temperature resistant pigments, to avoid fading, yellowing or carbonization during long-time high-temperature production.
For products with strict appearance requirements such as transparent PP tableware and high-gloss shells, pick masterbatch with superior dispersion to eliminate color specks and flow marks.
For food-contact PP products, use food-grade masterbatch that complies with safety standards.
Color Masterbatch for PE Injection Products
Adopt PE carrier masterbatch to ensure full fusion with HDPE/LDPE raw materials.
For soft PE products and thin-wall parts, choose masterbatch with low precipitation and low blooming, to prevent sticky surface and pigment migration.
For outdoor PE products exposed to sunlight for a long time, select UV-stabilized masterbatch to resist aging and color fading.
For recycled PE materials, use high-dispersion masterbatch to improve the overall coloring effect of mixed materials.
Products Preferred for PP
- Plastic basins, water buckets, laundry tubs and basin & bucket series
- Plastic stools, chairs, storage boxes, baskets and racks
- Food containers, lunch boxes, bowls, soup bowls, water cups and mouthwash cups
- Clothes hangers, basin stands, mop accessories and bathroom fittings
- Disposable food containers, takeaway boxes, compartment trays and fast food bowls
- Microwave-safe tableware, heat-resistant cups and bento boxes
- Lids for food, beverages, sauces and cans
- Automotive interior parts: door panels, instrument panel housings, bumper liners and interior trims
- Home appliance housings & components: washing machine inner tubs, air conditioner casings, fan blades and small appliance bases
- Turnover boxes, logistics crates, component boxes and plastic pallets
- Electrical trunking, junction boxes and insulating plastic parts
- Plastic toy bodies, building blocks and toy accessories
- Toolbox and portable case housings
- Mainly used for hollow containers, mostly translucent or milky white.
- Bottles for laundry detergent, dish soap, body wash, shampoo and other daily chemicals
- Chemical reagent barrels, small industrial plastic drums and antifreeze jugs
- Wide-mouth food bottles, sauce bottles and small storage jugs
- High-temperature resistant food blister packs, fresh food trays and cooked food containers
- Cake bases, baking packaging and disposable food trays
- Rigid plastic sheets, partitions and backing boards
- Woven bags, grain bags, courier bags and bulk bags
- Plastic ropes, binding ropes, fishing nets and general cords
- Carpets, base fabrics for artificial turf and decorative fabrics
- Top & bottom layers of face masks and medical protective non-wovens
- Disposable bed sheets, bed covers, shoe covers, caps and protective clothing fabrics
- Non-woven shopping bags, eco bags and gift bags
- Geotextiles, agricultural thermal fabrics and automotive interior non-wovens
- PPR hot & cold water pipes, pipe fittings and connectors (main material for plumbing pipes in buildings)
- Conduit pipes, drainage pipes and small industrial pipes
- Special-shaped profiles, sealing strips and plastic strips
Products Preferred for PE
- Food packaging bags, snack bags, shopping bags and supermarket carry bags
- Courier bags, logistics packaging bags and waterproof inner bags
- Agricultural films: greenhouse films, mulch films, insect-proof films and fresh-keeping films for fruits & vegetables
- Stretch films, wrapping films and industrial strapping films
- Disposable food containers, takeaway boxes, compartment trays and fast food bowls
- Garbage bags, flat bags, zip lock bags and inner lining bags
- Daily chemical bottles: shampoo bottles, body wash bottles, laundry detergent bottles and dish soap bottles
- Chemical barrels, pesticide bottles, oil cans, antifreeze barrels and various industrial liquid storage drums
- Milk bottles, yogurt bottles, condiment bottles and wide-mouth food bottles
- Large water storage buckets, water tanks and outdoor large containers
- Plastic basins, buckets, water ladles, washboards and general basin & bucket sets
- Plastic tables, stools, storage baskets, vegetable baskets and laundry hampers
- Clothes hangers, mop rods, bathroom fittings and other daily plastic wares
- Logistics turnover boxes, plastic crates, component boxes, aquatic product baskets and fruit baskets
- Plastic pallets, forklift boards and heavy-duty pallets
- Plastic bottle caps, anti-theft caps, sealing plugs and hose connectors
- Children’s toys, plastic amusement parts and fishing gear accessories
- Insulating sheaths and small electrical plastic parts
- PE water supply pipes, municipal water pipes and agricultural irrigation pipes
- Conduit pipes, cable protection pipes, corrugated pipes and drainage hoses
- Flexible hoses: shower hoses, water inlet hoses, gas hoses and industrial hoses
- Plastic strips, sealing strips and special-shaped extruded profiles
- Woven bags for grain, feed and chemical products
- Plastic ropes, binding ropes, fishing nets, net bags and sunshade nets
- Woven fabrics, geotextiles and safety nets
- Foam sealing strips, thermal insulation cotton and soft gaskets
- Paper-plastic composite films and coated paper (outer layer of paper cups and waterproof packaging)
- Laminated non-wovens and coated waterproof fabrics
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