Unbonded flash is loose rubber that has inadvertently adhered to the seal surface and may impair performance, or flash that does not properly bond to an intended mating material. As shown in Figure 174, the flap of rubber on the seal O.D. is flash that was not removed properly. It was not intended to bond to any surface on the case or seal. Conversely, the unbonded flash on the inside of the seal could in fact be expected to bond to the inside of the metal case. In this instance, however, it did not bond properly.

Unbonded flash can be caused by inconsistencies in the rubber compound and/or the material (such as metal) to which it is supposed to bond. Unbonded flash can also result from inconsistencies during molding (such as temperature or pressure fluctuations).

See Table 49 for a diagram of these seal components.

POSSIBLE MANUFACTURING DEFECTS MAIN PAGE