Washers are the parts that are placed between the connector and the nut. Compared with metal gaskets, plastic gaskets have excellent insulation, corrosion resistance, thermal insulation and non-magnetic properties, light weight, and are widely used in semiconductor, automotive, aerospace industry, interior decoration and other fields. Using more than 10 kinds of plastics, including PA66, PC, special engineering plastic PEEK with the best performance, modified PPS, PTFE, PP and PVD, etc.
PA66 is a crystalline engineering plastic. It is a high toughness material with small friction coefficient, good wear resistance and excellent self-lubrication. Its oil resistance and chemical resistance are also very good, so it is most suitable for mechanical materials, but due to its high hygroscopicity, it must be considered in the design. Water acts as a plasticizer to reduce the tensile strength and air permeability of nylon.
PEEK (polyetheretherketone) is a semi-crystalline special engineering plastic with the highest performance. Among engineering plastics, it has the best chemical resistance, only concentrated sulfuric acid can dissolve PEEK. In addition, it also has excellent heat resistance, wear resistance, flame resistance, hydrolysis resistance, and is widely used in electronic appliances, automotive machinery, semiconductors, aerospace, military and other fields.
PPS 【Polyphenylene Sulfide】
PPS (polyphenylene sulfide) is a crystalline special engineering plastic. It has excellent heat resistance, and its physical properties hardly deteriorate after long-term use at high temperatures. In addition, it has excellent chemical resistance, mechanical properties, electrical properties and dimensional stability, and is widely used in electrical and electronic parts, automotive parts and chemical mechanical parts, etc.
Take the gasket of new energy vehicle lithium battery as an example, it is suitable for sealing the sealing ring of the electrode part and the electrolyte to prevent the leakage of the electrolyte. Therefore, the requirements for gaskets are good sealing, creep resistance and chemical resistance, and heat resistance. The gasket made of PPS material has good sealing performance and can effectively prevent leakage of electrolyte; PPS has excellent mechanical properties, tensile strength and bending strength, far superior to PA.PC.PBT, etc., rigidity and creep resistance High performance; the melting point of PPS is 286°C, the thermal deformation temperature is 260°C, and the thermal stability is much higher than that of engineering plastics such as PA.PBT.POM. The long-term use temperature can reach 200-220°C, which can meet the requirements of high heat resistance of gaskets on the road. ;PPS has high crystallinity, good chemical resistance, and is resistant to electrolytes. It is insoluble in any organic solvent below 200 °C. In addition to strong oxidizing acids, it can also withstand the corrosion of various acids, alkalis and salts, second only to PTFE. vinyl.
PP (polypropylene) is a crystalline resin and is a representative general-purpose plastic. With a specific gravity of 0.9, it is the lightest among general-purpose plastics, and has excellent chemical resistance, hydrolysis resistance and electrical properties, and is widely used in various fields. However, its poor impact resistance, low dimensional stability, easy aging, and poor long-term thermal stability limit the application in some fields to a certain extent.
You can choose a suitable plastic according to the application characteristics and environment of your own gasket, combined with the advantages and disadvantages of each plastic.