PP plastic is colorless, odorless and non-toxic. It loo […]
PP plastic is colorless, odorless and non-toxic. It looks like polyethylene but is more transparent and lighter than polyethylene. PP is a kind of thermoplastic with excellent performance, which has the advantages of small specific gravity (0.9g/cm3), non-toxicity, easy processing, impact resistance and flex resistance.
Main properties of medical PP plastics
PP plastic raw material is a semi-crystalline material with high melting point, good heat resistance and can be sterilized at temperatures above 100 °C. Yield strength, tensile strength, compressive strength, hardness and elasticity are higher than polyethylene (PE).
Low temperature resistance and impact resistance:
The homopolymer PP has a high brittleness, and the random copolymer PP synthesized with ethylene has better toughness and stronger impact strength. Generally, products used under low temperature conditions should be modified with PP or by adding thermoplastic rubber to increase the flexibility and low temperature impact resistance.
The Non-PVC large infusion bag is made of copolymerized PP and elastomer blended modified material.
It is easily depolymerized and aged under the action of oxygen, heat and light, so it is necessary to add an anti-aging agent. PP products are not easy to bond, need to be treated before bonding, and special adhesives are used. The cyclohexanone used in the equipment factory cannot meet the requirements. The coloring property is poor, the shrinkage rate is large (generally 1.6-2.5%), the burn resistance is poor, and it is easy to catch fire. PP is a non-polar material and has a low adsorption capacity for drugs.