D

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.