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Marlex® Polyethylene for Injection Molding

Multicolored Crates

Injection molding is one of the most efficient and cost-effective manufacturing processes for producing high-volume plastic parts with consistent quality and tight dimensional control. Polyethylene is widely used in injection molding due to its toughness, chemical resistance, processability and ability to meet performance and regulatory requirements across a wide range of industries. 

CPChem has more than 40 years of experience developing high-quality polyethylene resins for injection molding applications. Our Marlex® polyethylene portfolio is engineered to deliver reliable performance in demanding applications ranging from rigid packaging and consumer goods to industrial containers and caps and closures.

Browse by Grade Below

HDPE Injection Molding Grades  LDPE Injection Molding Grades  MDPE Injection Molding Grades

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HDPE Injection Molding Grades 

ProductApplicationMI
(g/10 min)		Density ↑
(g/cm3)
Marlex® 9005 PolyethyleneLarge Containers6.00.945
Marlex® 9010 PolyethyleneFood, Agriculture, Industrial10.00.945
Marlex® 9010C PolyethyleneFood, Agriculture10.00.945
Marlex® 9045 PolyethyleneThin wall containers, Toys, Housewares45.00.950
Marlex® 9012 PolyethyleneToys, Housewares, Closures11.50.952
Marlex® 9012C PolyethyleneCaps, Closures11.50.952
Marlex® 9018 PolyethyleneCaps, Closures20.00.952
Marlex® 9035 PolyethyleneFood Containers, Toys40.00.952
Marlex® 9004 PolyethylenePails, Crates4.50.953
Marlex® 9006 PolyethylenePails, Crates6.60.953
Marlex® HMN 6060 PolyethylenePails, Crates6.50.962
Marlex® HMN 6060UV PolyethylenePails, Crates6.50.962
Marlex® 9708 PolyethylenePails, Crates8.00.962

 

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LDPE Grades for Injection Molding 

ProductApplicationMI
(g/10 min)		Density ↑
(g/cm3)
Marlex® 1007 PolyethyleneCaps, Housewares7.00.917
Marlex® 1009 PolyethyleneCaps, Housewares16.00.917
Marlex® 1122B PolyethyleneCaps, Housewares2.10.920
Marlex® 1412 PolyethyleneThin Wall Molding35.00.924
Marlex® KN226 PolyethyleneCaps, Housewares25.00.925

 

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MDPE for Injection Molding 

ProductApplicationMI
(g/10 min)		Density ↑
(g/cm3)
Marlex® 9118 PolyethyleneDurable Containers and Goods18.00.933

 

Why Polyethylene for Injection Molding?

Polyethylene offers an exceptional balance of mechanical performance, processing flexibility and cost efficiency, making it a preferred material for injection-molded parts.

Key advantages include:

  • Excellent toughness and impact resistance
  • Good chemical and moisture resistance
  • Wide processing window and stable molding behavior
  • Lightweight material with strong stiffness-to-weight ratio
  • Suitability for food-contact and regulated applications (grade dependent)

Injection Molding Applications

Injection-molded polyethylene parts are used across virtually every major industry. Polyethylene’s versatility allows manufacturers to tailor part performance by selecting the appropriate resin density, melt index and molecular structure.

Typical applications include:

  • Caps and closures
  • Food containers and rigid packaging
  • Crates, pails and industrial containers
  • Housewares and consumer goods
  • Toys and recreational products
  • Automotive components and under-the-hood parts 

Technical Support for Your Application

CPChem provides application focused technical support to help customers select the right polyethylene grades and achieve targeted performance in injection molded parts. Our experts work directly with processors to optimize molding conditions, improve cycle times and enhance part quality through process development and troubleshooting. With the added advantage of pilot line capabilities, we offer a unique platform to validate designs, refine formulations and accelerate new product development. 

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