Good and bad judgment of rubber seals

Qualified products should meet the following conditions: 1. The code on the end face should be consistent with the requirements. 2. The surface should be smooth, free from defects and deformed. 3. The shape of the rubber seal with a skeleton is positive and the end face is perfectly round. Placed on the glass plate, it should be attached to the glass surface without disturbing music. 4. The outer edge of the non-skeletal oil seal should be straightened, and the end surface should be flat. After hand-holding, it can be deformed, and it can be restored to its original shape after loosening. 5. The shape and thickness of the cutting edge should be the same on the entire circumference. When fitting with the fittings, the cutting edge should fit tightly on the supporting neck. 6, rubber spring seal with spring, spring should be no corrosion, no deformation, and can be more firmly stuck in the spring groove. Take 50*72*12 rubber oil seal as an example. The oil seal is allowed to fall freely from a height of 1 m. If the spring falls off less than once per five times, then the spring and the oil seal can be considered to fit well. 7. When distributors purchase plastic rubber seals in batches, they can first take samples for oil immersion tests and measure the rate of change of their quality. For example, after the oil seal is soaked for 24 hours at a temperature of (705) degrees with No. 25 transformer oil, the mass change rate should be between 3% and 5%.