We normally buy o-ring direct from the manufacture, they come in sealed plastic bags and we take them straight into our clean room without washing. We have a couple of applications that use fluorosilicone o-rings which are somewhat delicate and rather easy to damage during installation so we have been having those o-rings shipped from the manufacture to another supplier who applies an anti-friction coating. These go back to the manufacture who repackages them and ships to us. Even though we 100% leak test the finished assemblies before shipping, we have had some field returns for leakage. When we test them we verify the leakage and on disassembly have found small fibers on the coated o-rings. We did a complete process walk of our clean room procedures and have determined that the fibers are on the coated o-rings when we receive them. We want to establish a cleanliness requirement for the incoming o-rings, hence my request.
I don't understand quite how these units pass initial testing and fail later but I'm pretty sure that won't happen if we don't have any fibers.
The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.