Qualified products shall meet the following conditions:

1. The code mark on the end face is consistent with the need.

2, smooth surface, no defect, no deformation.

3, with the skeleton of the rubber oil seal shape is correct, the end face is round, placed on the glass plate should be fitted with the glass surface, no disturbance phenomenon.

4. The outer edge of the skeletonless oil seal should be correct, the end face should be flat, and the deformation can be made by hand, and the original shape can be restored after letting go.

5. The shape and thickness of the cutting edge on the whole circumference should be consistent. When fitting the fitting kit, the cutting edge should be closely fitted on the matching neck.

6, rubber oil seal with spring, spring should be no corrosion, no deformation, and can be firmly stuck in the spring groove. Take 50*72*12 rubber oil seal as an example. Make the oil seal fall free from 1m height, if every 5 times the spring falls off not more than 1 times, then it can be considered that the spring and the oil seal match well.

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