Medical Main Raw Material Price Trend – Polytetrafluoroethylene(PTFE) Leave a comment

Medical Materials-Plastic

Polytetrafluoroethylene(PTFE). The basic requirements of medical plastics are chemical stability and biological safety, because they are in contact with drugs or the human body. The components in the plastic material cannot be precipitated out into the liquid medicine or the human body, will not cause toxicity and damage to tissues and organs, and are non-toxic and harmless to the human body. In order to ensure the bio-safety of medical plastics, medical plastics that are usually sold on the market are certified and tested by medical authorities, and users are clearly informed which grades are medical grade. Polytetrafluoroethylene(PTFE)

The application of plastics in medical plastics has a low cost and can be reused without disinfection. It is suitable for use as raw materials for the production of disposable medical devices; it is simple to process and can be processed into a variety of useful structures by its plasticity, while metal and glass are difficult Manufactured into products with complex structures; tough, flexible, not as easily broken as glass; with good chemical inertness and biological safety. These performance advantages make plastics have a wide range of applications in medical equipment, including polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC), ABS, Polyurethane, polyamide, thermoplastic elastomer, polysulfone and polyether ether ketone, etc. Blending can improve the performance of plastics and make the best performance of different resins manifested, such as polycarbonate/ABS, polypropylene/elastomer and other blending modification. The 7 commonly used medical plastics are polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS) and K resin, acrylonitrile-butadiene-styrene (ABS), Polycarbonate (PC) and polytetrafluoroethylene (PTFE) general plastics are synthesized and come out of the synthesis tower of a large petrochemical plant. They are all flour-like powders and cannot be used to directly produce products. This is what people often say The composition of fat extracted from tree sap is the same, also called resin, also called powder. This is a pure plastic with poor fluidity, low thermal stability, easy aging and decomposition, and not resistant to environmental aging. In order to improve the above defects, heat stabilizers, anti-aging agents, anti-ultraviolet agents, plasticizers, etc. are added to the resin powder, which is modified by granulation to increase its fluidity, and produce special products suitable for various processing techniques. Performance, different grades of plastic varieties. The plastic materials commonly used by medical device manufacturers are all modified plastic particles that can be used directly. For products with special properties that are not available in the market, equipment factories can introduce granulation production lines and process and produce plastic granules through different formulation designs. Therefore, there are many grades of the same type of plastic. According to the processing method, there are injection molding grade, extrusion grade, and blown film grade; according to performance, there are high rigidity, toughening, etc. . The components in the plastic material cannot be precipitated out into the liquid medicine or the human body, will not cause toxicity and damage to tissues and organs, and are non-toxic and harmless to the human body. Due to contact with the liquid medicine Or in contact with the human body, the basic requirements of medical plastics are chemical stability and biological safety. In order to ensure the bio-safety of medical plastics, medical plastics that are usually sold on the market are certified and tested by medical authorities, and users are clearly informed which grades are medical grade. At present, there are still quite a few medical plastic materials in China that have not undergone strict biosafety certification, but with the gradual improvement of laws and regulations, these situations will be improved. Medical plastics in the United States usually pass FDA certification and USPVI biological testing, and medical-grade plastics in my country are usually tested by Shandong Medical Device Testing Center. According to the structure and strength requirements of the equipment products, we choose the appropriate plastic type and the appropriate brand, and determine the processing technology of the material. These properties include processing performance, mechanical strength, use cost, assembly method, sterilization and so on. The processing properties and physical and chemical properties of several commonly used medical plastics are briefly introduced as follows: Polytetrafluoroethylene(PTFE)

Polytetrafluoroethylene, Polytetrafluoro ethylene

PTFE resin is white powder, waxy in appearance, smooth and non-sticky, and is the most important plastic. PTFE has excellent performance, which is not comparable to ordinary thermoplastics, so it is known as the “Plastic King”. Its friction coefficient is the lowest among plastics, and it has good biocompatibility. It can be made into artificial blood vessels and other devices directly implanted in the human body. Polytetrafluoroethylene(PTFE)

PTFE resin is white powder, waxy in appearance, smooth and non-sticky. PTFE has excellent performance, which is not comparable to ordinary thermoplastics, so it is known as the “Plastic King”. Its friction coefficient is the lowest among plastics, and it has good biocompatibility. It can be made into artificial blood vessels and other devices directly implanted in the human body. The processing is difficult. Generally, the powder is cold pressed into a blank, and then sintered or extruded. It is not recommended for equipment manufacturers to produce this product, and it is better to purchase directly when the quantity is not large. Transparent pellets, injection molding and extrusion molding. The molding temperature is 300-330℃, and the temperature above 350℃ is likely to cause discoloration or air bubbles. It is suitable for high-speed and low-pressure molding, and it is difficult to demold. It has poor fluidity and is easy to decompose. Corrosive gas is generated during decomposition. The molding temperature should be strictly controlled not to exceed 350°C, and the mold should be heated to 100-150°C. Chemical resistance and chemical stability are currently the most superior plastics known. It is completely stable to strong acids, strong bases and various oxidants and other highly corrosive media, even boiling “aqua regia”. . It has excellent heat and cold resistance, and can be used for a long time in the range of -195-250°C without performance changes. The shortcomings of PTFE are large thermal expansion coefficient, poor wear resistance and mechanical strength, insufficient rigidity, and difficulty in molding. But the radiation resistance is excellent. Polytetrafluoroethylene(PTFE)

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