Deflash
A process of removing unwanted, excess material (flash) from a finished product.
Degassing
Intentional, controlled outgassing of the volatile (evaporative) components of elastomeric materials.
Diametrical Clearance
The gap between the two mating metal surfaces forming a gland's internal cavity. Through slight oversizing and accompanying “squeeze,” the o-ring seals this gap to prevent system leakage.
Durometer
A measure of the hardness of a rubber compound. In a Shore A scale, the resultant numerical rating of hardness runs from lower numbered (30 or 40) softer materials to higher numbered (80 to 90) harder materials. Usually designated with a ±5 tolerance.
Dynamic Seal
Any application involving reciprocating, rotating, or oscillating motion relative to the seal.

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