The difference between PPR and PPB materials

PP-R (polypropylene random copolymer) and PP-B (polypropylene block copolymer) are two different types of polypropylene, and they have some differences:

1.Differences in molecular structure

PP-R is a random copolymer. The propylene monomers in its molecular structure are randomly arranged without specific crystallization regions, making it highly thermoplastic and plastic.PP-B is a block copolymer in which two different propylene monomers are alternately arranged in its molecular structure to form a block structure with specific crystalline regions, giving it high stiffness and strength.

2.Physical performance differences

PP-R usually has good heat resistance and can be used under high temperature conditions. It has high impact strength and toughness and is suitable for manufacturing pipes, valves, etc.PP-B has good stiffness, hardness and strength, but its heat resistance is generally not as good as PP-R, so it is suitable for manufacturing relatively rigid parts, pipes, etc.

3.Differences in application areas

PP-R is commonly used in the manufacture of hot water pipes, cold water pipes, heating systems, air conditioning systems, etc., as well as some applications that require high heat resistance.PP-B is often used in the manufacture of pipes, containers, electronic and electrical components, automobile parts, etc., as well as some applications that require higher stiffness.

4.Differences in processing characteristics

Due to the difference in molecular structure, PP-R has better processability and is easier to shape than PP-B, so it usually has more advantages when manufacturing products with complex shapes. Generally speaking, PP-R and PP-B have different molecular structures, physical properties, application fields and processing characteristics. The choice of which material to use depends on the requirements and performance needs of the specific application.

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