What The Differences Between PP-H,PP-B And PPR?

• Homopolymer polypropylene (PP-H):

It is polymerized by a single propylene monomer, which is the lowest density of common plastics, and its molecular chain regularity is very high, so the crystallinity of the material is high and the impact performance is poor.

 

Advantages: Good strength, good corrosion resistance.
Uses: Can be used for packing belt, blow bottle, brush, rope, woven bag, toys, folders, electrical appliances, household goods, microwave lunch box, storage box, wrapping paper film.

 

•  Block (impact resistant) copolymer polypropylene (PP-B)

Obtained by copolymerization of propylene and part ethylene, the ethylene content is generally 7% ~ 15%, but because the probability of two ethylene monomers and three monomers connecting together in PP-B is very high, it indicates that the ethylene monomer only exists in the block phase, and the regularity of PP-H is not reduced. Therefore, it can not achieve the purpose of improving PP-H melting point, long-term hydrostatic pressure resistance, long-term heat resistance and pipe processing and forming properties.

Advantages: Good impact resistance.

Uses: Used for bumper, thin-wall products, baby carriage, sports equipment, luggage, paint bucket, battery box, thin-wall products.

 

• Random copolymer polypropylene (PP-R) 

It is obtained by copolymerization of propylene monomer and a small amount of ethylene monomer (1%~4%) under heating, pressure and catalyst. The ethylene monomer is randomly distributed in the long chain of propylene. The random addition of ethylene reduces the crystallinity and melting point of the polymer, improves the impact of the material, the long-term resistance to hydrostatic pressure, the long-term heat resistance to oxygen aging and the properties of pipe processing and forming.

PP-R molecular chain structure, ethylene monomer content and other indexes have a direct effect on the long-term thermal stability, mechanical properties and processing properties of the material. The more random the distribution of ethylene monomer in the propylene molecular chain, the more significant the change of polypropylene properties.

Advantages: good overall performance, good heat resistance, good dimensional stability, excellent low temperature toughness (good deflection), good transparency, good gloss.
Uses: Used for pipe, shrink film, drip bottle, high transparent container, transparent household goods, disposable syringe, wrapping paper film.
 

• Comparison of properties of three kinds of polypropylene

Tensile yield strength: Homopolypp > Block copolypp > random copolypp.
Rigidity: Homopolypp > Block copolypp > random copolypp.
Impact strength: Block copolymer > random copolymer > Homopolymer.
Transparency: Random copolymer > Homopolymer > Block copolymer.
Low temperature toughness: Block copolypp > random copolypp > Homopolypp.

 

About Us

Luoyang Dema Import & Export Co., Ltd. aims to provide high-quality, cost-effective products for global factories, plastic product manufacturers, and material distributors.Luoyang Dema Import & Export Co., Ltd. provides thebest PP, PE, PVC, AVE, ABS material solutions for plastic product manufacturers, wholesalers, distributors, distributors, factory owners, processing workshops, etc.

If you are looking for general plastic materials, please feel free to get the latest prices and quotations from Luoyang Dema Import & Export Co., Ltd.
The sales team will reply within 48 hours.