polypropylene injection molding

Polypropylene Injection Molding Service

Custom Polypropylene Injection Molding Solution

Polypropylene(PP) is a stiff, strong, non-polar, and crystalline thermoplastic polymer. This material has several uses, including packaging. Automotive, electrical sectors, consumer goods, medical, and other industries are all represented. It is a synthetic resin and linear hydrocarbon that is one of the world’s most widely used thermoplastics.

Polypropylene has two classifications which are homopolymer and copolymer. The copolymer can be identified as a random copolymer, impact copolymer, or block copolymer. This material exhibits excellent characteristics and features such as heat and chemical resistance and its durability is best suitable for injection molding processes. NDDMold offers you the best quality material of polypropylene for industrial use.

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Advantages of Polypropylene for Injection Molding

Low Density
Wide mechanical property range
Better Transparency
Retains electrical properties
Superior Strength
Fatigue resistant
Polypropylene’s Characteristics

Polypropylene provides outstanding manufacturing owing to its durability, adaptability, and stiffness. It is also characterized as lightweight, good fatigue resistant, has integral hinge properties, high heat resistant, chemical resistant, water-repellent, weldability, flexible, thermal insulation, and moisture absorption resistant material. As a result, polypropylene may e easily melted during the process of injection molding.

Process of Polypropylene for Injection Molding

A multitude of phases are involved in polypropylene injection molding, and each is essential in guaranteeing the finished product satisfies the required specifications:

Mold design: At NDDMold, we ensure to have a skilled engineer that creates the mold in accordance with the specifications and required part shape in order to maximize the mold design, variables including shrinkage, draft angles, and component ejection.

Material preparation: The resin is subsequently put into the hopper of the injection molding machine, where melting and homogenization take place.

Setting up the injection molding machine: To provide the ideal circumstances for the polypropylene grade being used, the injection molding machine is prepared by modifying the temperature, pressure, and speed settings.

Injection and cooling: The mold cavity is filled with molten polypropylene that has been injected under strong pressure, assuming the shape of the mold in the process. The polymer solidifies and acquires the necessary physical characteristics during the subsequent cooling process.

Finishing and part ejection: The component is expelled from the mold when it has cooled and hardened to the proper degree. To satisfy particular needs, secondary procedures can be carried out, such as reducing superfluous material or applying surface treatment

At NDDMold, we ensure fast and smooth Polypropylene processes because we are equipped with advanced machines and technologies for injection molding.


Automotive industry: HVAC (heating, ventilation, and air conditioning) systems, dashboards, door panels, bumpers, and other internal and external parts.

Industry of packaging: Including bottles, caps, containers, and films.

Medical industry: Including syringes, IV components, medical trays, and containers in the medical industry.

Consumer Goods. The Toys, appliances, home items, and recreational goods.

And many more.

Classifications of Polypropylene
  • Polypropylene Homopolymer. This is the most popular polypropylene rope used in injection molding. It is often utilized in applications that need structural stability.
  • Copolymer Polypropylene. It has more impact resistance and flexibility than homopolymer polypropylene due to the inclusion of ethylene monomers, which produce a more random arrangement of polymer chains. It is best suitable for application that requires toughness

Polypropylene Properties

Polypropylene has a melting point depending on its type. The melting point for homopolymer ranges from 160 to 165°C while in copolymer it ranges from 135 to 159°C. The density is classified depending on its type also, In Homopolymer has density ranges between 0.904 and 0.908g/cm3, Copolymer, specifically  Random copolymer, has a density of 0.904 to 0.908 g/cm3 while Impact Copolymer has a density of  0.898 to 0.900 g/cm3.

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