Polyurethane seals, manufactured using polyurethane processing technology, come in a wide range of product types, including rubber O-ring seals, polyurethane V-ring seals, U-ring seals, Y-type seals, etc., which will not be elaborated on one by one. The full name of the rubber material used in polyurethane seals is rubber, which is an elastomer with properties between natural rubber and general plastics, and also a synthetic polymer structure. Currently, the polyurethane rubber used in metal sheet pressure processing is mainly of the polyester castable type. It is formed by polycondensation of adipic acid and ethylene glycol to form a prepolymer with a relatively low molecular weight and isocyanate-terminated end groups. Depending on the content of terminal isocyanates, it undergoes melt mixing, casting, molding, and post-curing to obtain polyurethane rubber products with different hardness levels.
Excessive pre-compression during mechanical operation is the main cause. Therefore, it is necessary to correctly select the specifications of the seal, including its inner and outer diameter dimensions, to ensure a reasonable fit.
Impurities in the cylinder can contaminate and wear the polyurethane seals. Thus, it is crucial to ensure clean oil is used.
Note that areas with concentrated loads on the seal will experience greater wear, while other areas will hardly wear. Use guiding/installation tools for seals to ensure proper force during assembly.
High temperature and high pressure operating conditions can cause cracks in the seal, which directly lead to oil leakage. Therefore, it is important to monitor changes in operating conditions.
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