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Performance MaterialsPolypropylene

Polypropylene

Superior performance enhanced through high temperature resistance, lightweighting, and chemical resistance.

Polypropylene is a thermoplastic resin. Different formulations and modifications allow for its widespread application across different industries.


As a leading polypropylene manufacturer and supplier, LCY’s polypropylene product portfolio meets the diverse needs of various industries such as household goods, healthcare, automotive, construction, and baby care. The wide range of physical properties available through modification, ease of processing, and cost-effectiveness make polypropylene an attractive alternative to more expensive resins in a variety of applications.

Polypropylene Features and Benefits

  • Lightweight (low specific gravity)
  • High temperature resistance
  • Good chemical resistance
  • Excellent rigidity
  • High tensile strength
  • Excellent flexural strength

Product Categories

Homopolymer consists solely of propylene in the polymer chain. As a semi-crystalline polymer, it exhibits excellent mechanical properties such as high rigidity, high tensile strength, and good thermal deformation resistance due to its high crystallinity. Additionally, its good flowability and high crystallization temperature contribute to a shorter molding cycle time. Homopolymer is widely used in injection molding and yarn extrusion.
Random copolymer, characterized by lower crystallinity, offers improved transparency and softer feel. Compared to homopolymer, its lower melting point and crystallization temperature make it easier to process and mold. With appropriate surface treatment, random copolymer can achieve good printability. The enhanced transparency of random copolymer enhances the aesthetics of products, making it a popular choice for food packaging and household items.
Heterophasic (impact) copolymer is also called block copolymer. To improve the impact resistance of polypropylene, ethylene-propylene rubber (EPR) is dispersed in the polymer matrix during the polymerization process. Impact copolymer exhibits good impact resistance at both ambient and low temperatures, making it suitable for cold weather applications. It also exhibits good long-term thermal stability (aging resistance), making it ideal for automotive and appliance applications.
Polypropylene advanced materials are polypropylene resins that suppliers have modified with other polymers to enhance performance and improve the impact resistance while maintaining transparency and improving overall product performance.
Based on insights into polypropylene (PP) market trends and the company's long-standing commitment to innovation, LCY aims to develop products based on "renewable polypropylene" and "circular polypropylene" as effective sustainable solutions.

Polypropylene Applications

Impact copolymer is a type of polypropylene resin with good long-term thermal stability (aging resistance) and strong impact resistance at both ambient and low temperatures, making it ideal for automotive applications.

Homopolymer's good melt flow and high crystallization temperature contribute to a shorter molding cycle time, making this type of polypropylene resin ideal for the manufacture of disposable packaging.

Homopolymer is a polypropylene resin that exhibits high rigidity, high tensile strength, and good thermal deformation resistance due to its high crystallinity, great for manufacturing electrical appliances.

The long-term thermal stability (aging resistance) and strong impact resistance at both ambient and low temperatures of impact copolymer makes it the ideal polypropylene resin for manufacturing toys and car seats for children.

Characterized by lower crystallinity, random copolymer offers improved transparency and a softer feel. Its lower melting point and crystallization temperature make it easier for polypropylene manufacturers to process and mold. With appropriate surface treatment, random copolymer can achieve good printability. Its enhanced transparency enhances the aesthetics of products, making it a popular choice for food packaging and household items.

Polypropylene advanced materials are modified by polypropylene manufacturers to enhance performance and improve the impact resistance of polypropylene, while maintaining transparency and improving overall product performance. Common applications of polypropylene advanced materials include clear bottles and household appliances.

Frequently Asked Questions

What medical‑grade certifications has LCY obtained?

Medical‑grade polypropylene must pass stringent certification requirements. LCY’s products comply with USP Class VI biocompatibility testing and the ISO 10993 biological evaluation standard for medical devices. In addition, compliance with REACH and RoHS ensures the absence of harmful substances (such as heavy metals at 99% elimination).

Which grades are resistant to radiation sterilization, and how robust is their performance after irradiation?

LCY’s radiation‑resistant polypropylene is specifically engineered for medical applications. It maintains excellent physical properties after gamma or electron‑beam irradiation at 25–50 kGy, with 30–50% lower yellowing compared with conventional PP, preventing brittleness issues. Test data show that after 1,000 hours of post‑irradiation aging, performance stability remains above 95%.

This material is suitable for IVD devices such as diagnostic tubes and culture dishes, ensuring sterilization does not affect accuracy. Overall, it provides more reliable performance than standard PP, reducing the risk of product failure.

Which PP grades are suitable for producing food packaging and cosmetic containers?

For such applications, clarity and surface gloss are key requirements. Random Copolymer PP is typically preferred because it enhances visual transparency.

If higher rigidity is needed, Homopolymer PP with clarifying agents may also be considered.

For applications requiring low‑temperature impact resistance while maintaining transparency, LCY offers corresponding modified PP materials.

Does LCY offer environmentally friendly PP materials?

Yes. LCY has obtained ISCC certification, and renewable feedstock can be applied across the full product range to support customers’ carbon‑reduction and sustainability goals.

Additionally, our modified‑materials division provides technical solutions based on physically recycled materials.

What performance advantages does modified polypropylene offer compared with conventional polypropylene?

By compounding with other polymers (such as elastomers), modified PP provides enhanced impact resistance (>200 J/m) and improved scratch resistance.

Sustainable versions can contain up to 70% PCR (post‑consumer recycled content), achieving a 20–30% carbon‑footprint reduction, while maintaining performance comparable to virgin PP.

Depending on property requirements—such as improved printability, rigidity, or weatherability—we can also recommend corresponding grades.

What are the key differences among Homopolymer, Random Copolymer, and Impact Copolymer polypropylene, and how should one select the appropriate type?

LCY Globalene® polypropylene is categorized into three major types based on ethylene‑copolymerization structure:


Homopolymer: Pure polypropylene with high crystallinity.

Random Copolymer: Randomly distributed ethylene reduces crystallinity.

Impact Copolymer (Heterophasic/Block): A dispersed rubber phase provides toughness.


All share PP’s advantages such as lightweight properties, chemical resistance, ease of processing, and a density of approximately 0.90 g/cm³.

However, they differ significantly in rigidity, clarity, impact strength, and end‑use applications.

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