PPS/PEEK/PA66/PP In Gasket Applications

A washer is a component that fits between a connector and a nut. Compared to metal washers, plastic washers have excellent insulation, corrosion resistance, thermal insulation and non-magnetic properties, are lightweight, and are widely used in semiconductor, automotive, aerospace industries, and interior decoration. Up to 10 types of plastics are used, including Pa66, PC , PEEK, a specialty engineering plastic with optimal performance, modified PPS , PTFE, PP and PVD.

PA66 (Nylon 66)

PA66 is a crystalline engineering plastic. It is a high toughness material with a small coefficient of friction, good wear resistance and excellent self-lubrication. It also has good oil resistance and chemical resistance, so it is most suitable for mechanical materials, but due to moisture absorption, must be considered in the design, moisture as a plasticizer reduces the tensile strength of nylon, permeability.

PEEK (Polyetheretherketone)

PEEK (polyether ether ketone) is a semi-crystalline specialty engineering plastic with the highest level of performance. In engineering plastics, it has the best chemical resistance, only concentrated sulfuric acid can dissolve PEEK. in addition, it also has excellent heat resistance, abrasion resistance, flame retardant, hydrolysis resistance, widely used in electronic and electrical appliances, automotive machinery, semiconductors, aerospace, military and other fields.

PPS (Polyphenylene Sulfide)

PPS (polyphenylene sulfide) is a crystalline special engineering plastics. It has excellent heat resistance, long-term use at high temperatures, physical properties will hardly deteriorate. 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 machinery parts.

Take the gasket of lithium battery for new energy vehicles as an example, it is suitable for the sealing of electrode part and electrolyte to prevent the leakage of electrolyte. Therefore, the requirements for the gasket are good sealing, creep resistance and chemical resistance, heat resistance. The use of PPS materials made of gaskets with good sealing, can effectively prevent the leakage of electrolyte; PPS has excellent mechanical properties, tensile strength and bending strength, far better than PA.PC.PBT, etc., rigidity and creep resistance; PPS melting point of 286 ° C, the heat distortion temperature of 260 ° C, thermal stability is far more than the engineering plastics, such as PA.PBT. Can reach 200-220 ℃, can meet the requirements of high heat resistance of the gaskets on the way to meet the car; PPS high crystallinity, good chemical resistance, electrolyte resistance, insoluble in any organic solvent below 200 ℃, in addition to strong oxidizing acid, but also to withstand a variety of acids, alkalis, salts corrosion, second only to Polytetrafluoroethylene.

PP (Polypropylene)

PP (polypropylene) is a crystalline resin and a representative general-purpose plastic. Specific gravity of 0.9, the lightest weight in general-purpose plastics, with excellent chemical resistance, resistance to water decomposition and electrical properties, widely used in various fields. However, its poor impact resistance, low dimensional stability, easy aging, long-term thermal stability is not good, to a certain extent, to limit the application of certain areas.

You can according to their own gasket application characteristics and environment, and then combined with the advantages and disadvantages of each plastic to comprehensive consideration, to choose the right plastic.