SPIRAL EMC Joints

In order to compress the „Spira Shield“ gaskets by 25% of their diameter the following forces are required:

• Standard Force: 30 pounds per linear inch of the gasket
• Moderate Force: 10 pounds per linear inch of the gasket
• Low Force: 2 pounds per linear inch of the gasket.

Spira Strip (Military Grade)

Spiral gasket with tin-plated beryllium copper and elastomer seal
Spira Strip is a Spira shield gasket to which a strip of solid or foamed elastomer has been attached. The elastomer is provided with adhesive tape to keep the spiral in the required position. Solid elastomers also serve as a mechanical stop to protect the spiral gasket from excessive compression as well as acting as a seal.
Foamed elastomers are preferred as environmental seals against rain, wind and dust.
Solid silicones have a Shore hardness of approx. 40°. They can be supplied as fluorosilicone if the „S“ from the order number is replaced by an „F“ (e. g. SS-0622/F).
Moderate Force und Low Force spirals have a solid elastomer core of approx. 80 Shore and a diameter some 75% of that of the spiral.
The Moderate Force spiral can also be ordered without the elastomer core by adding „NC“ to the order number (e.g. MS-0834 NC/S).
Foamed silicones are supplied with Shore hardness of 15°-25°. They can also be replaced by a neoprene foam if the „C“ is replaced by „A/P“ (e.g. MS-0623-A/P).

Spira Strip (Commercial Grade)

Basic Spira Multi-Seal