Nothing! BUNA is a trade name for the chemical compound Nitrile.
When talking about elastomers, durometer describes the hardness of the material.
Very Little. A Polypack is what's referred to as a Loaded U-Cup, whereas what we casually call a U-Cup, is technically a Non-Loaded U-Cup.
No. Viton can only be used in water up to 100 degrees Celcius
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