Revealing the Secrets of Commonly Used Medical Injection Moulding Parts Materials

Commonly used medical injection molding materials

There are more than 90 types of polymer materials used in Medical plastic molds products. Plastics have been increasingly widely used in the medical field due to their excellent properties, reliable performance, and convenient molding processes, making medical supplies made of plastic materials promising. The following introduces the major categories of commonly used Medical Plastic Injection Moulding parts materials.

Polyvinyl chloride (PVC)

PVC is a raw material commonly used in the preparation of medical plastic products, and its usage accounts for more than 25% of medical plastics. The resin has low cost, wide application range and easy processing, and has good chemical resistance, mechanical properties and electrical properties, but its light resistance and thermal stability are poor. Modified PVC plastic can be widely used to make blood storage bags, blood transfusion bags, blood catheters, artificial peritoneum, cardiac catheters and other products.

Polyethylene (PE)

Including LDPE, HDPE, UHMWPE, etc.

LDPE is low density polyethylene. It is mainly used to blend with other plastics to produce medical packaging bags and intravenous injection containers. It can also be made into high-temperature sterilization-resistant medical plastic bag products.

HDPE is high density polyethylene. It has good mechanical properties and can be used in artificial lungs, artificial tracheas, artificial throats, artificial kidneys, artificial urethras, artificial bones, orthopedic repair materials and disposable medical supplies, etc., and can be used as fillers to improve the flow properties of products.

UHMWPE is molecular weight polyethylene. It has good chemical stability, wear resistance, corrosion resistance and biological inertness, and is a good material for manufacturing artificial lungs and joints.

Polypropylene (PP)

Medical PP should meet the requirements of high purity, non-toxicity, non-irritation, good chemical stability, no degradation, no inflammation, no allergic reaction, good biocompatibility, no carcinogen, no hemolysis and coagulation, etc. And can withstand ethylene oxide disinfection treatment.

Polytetrafluoroethylene (PTFE)

Polytetrafluoroethylene is mainly used in fluoroplastics, which has high crystallinity, small friction coefficient, good heat resistance, and high chemical stability. This material is acid-resistant, alkali-resistant, and resistant to various organic solvents. Almost insoluble in all solvents. At the same time, PTFE has the characteristics of high temperature resistance and low friction coefficient, so it can not only provide lubrication, but also become an ideal coating for the inner layer of easy-to-clean pans and water pipes.

It has sealing properties, high lubrication and non-stickiness, electrical insulation, good anti-aging ability, and excellent temperature resistance (can work for a long time at temperatures from 250°C to -180°C). PTFE itself is not toxic to humans.

Has the best aging life among plastics. It is the one with the lowest friction coefficient among solid materials, only 1/5 of polyethylene. It is a small surface tension in solid materials and does not adhere to anything. It is physiologically inert and can be used as artificial blood vessels and organs for long-term implantation in the body without adverse reactions. It can be used as human body substitutes for arteries, veins, cardiac membranes; endoscopes, clamp catheters, tracheas; other tubes, bottles, filter cloths and other medical equipment. PTFE has poor radiation resistance and will cause degradation after being exposed to radiation.

Polyurethane: Thermoplastic Polyurethane (TPU)

Thermoplastic polyurethane has good transparency, high strength and tear properties, chemical resistance and wear resistance; the resin also has a wide hardness range, a smooth surface, is antifungal and microbial, and has high water resistance stability . These advantages allow thermoplastic polyurethane to be used as medical tubing, oxygen masks, catheters, drug delivery equipment, etc.

Polycarbonate (PC)

Typical properties of polycarbonate are toughness, strength, rigidity and resistance to heat steam sterilization. These characteristics make polycarbonate a preferred choice for hemodialysis filters, surgical tool handles and oxygen tanks.

Polyphenylene terecarboxylic acid (PET)

The excellent chemical and physical properties of PET also lie in its good adaptability to modification treatment. There are currently a variety of modified PET available to meet the different needs of the medical plastics market.

others:

Materials for medical injection molded parts also include sulfones, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyimide, etc.