Basic Multi-Seal Gasket

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Basic multi seal
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Spira’s Basic Multi-Seal gasket is the gasket of choice when you need an outstanding environmental seal for a surface mount application. The standard configuration includes a Spira-Shield gasket for superior shielding, however other gasket combinations can be specified if needed.

Gasket DimensionsBasic Multi-Seal Part Numbers
Elastomer Thickness AElastomer Width BBulb Thickness CSpiral Diameter DTotal Gasket WidthStandard Force*Moderate ForceLow Force

Moderate and low force gaskets come with a cord unless specified otherwise.
*All standard force gaskets come without a cord.

The Multi-Seal gasket is made by attaching the Spira-Shield gasket to a silicone elastomeric extrusion. The extrusion is used to hold the EMI gasket in place and provides an excellent, low force environmental seal. This gasket can be made into a custom Framed Gasket to your specifications.


Spiral: Spira-Shield, Tin/lead plated beryllium copper.
Elastomer: Solid silicone rubber, 60 durometer.

Shielding Quality

This gasket offers shielding quality from 86 dB to 165 dB. The shielding quality may vary depending on your specific application.

Compression Force

Basic Multi-Seal gaskets come in three different resiliencies. Optimal compression of the gasket is 25% of the diameter of the spiral. Since the force to compress the gasket is a function of the cube of the thickness of the beryllium copper ribbon, the compression forces shown are approximate.

Standard Force: ~33 pounds per linear inch compression.
Moderate Force: ~13 pounds per linear inch compression.
Low Force: ~5 pounds per linear inch compression.


This gasket is surface mounted.

Spiral Material

Basic Multi-Seal comes standard with a tin/lead plated Spira-Shield gasket. Other spiral materials or plating options may be specified including: stainless steel, edge tin/lead plating and RoHS compatible plating. Please contact us for more information.

Cord Insert

Standard Force gaskets come without a cord and we recommend to omit the cord in all gaskets by specifying “NC” (no cord). Cord is available if needed in PVC, solid fluorosilicone, solid silicone and thermal plastic rubber depending on the size and should be ordered to match the elastomer chosen. Please contact us for details.
NC: No Cord (Example: CMS-0835 NC)

Special Elastomer

The standard elastomer is solid silicone. A special elastomer can be specified as shown below (available in certain sizes only). Note that these elastomers (as with most special options) are non-stock items and will include additional charges.
/E: EPDM* (Example: CMS-0835 /E)
/F: Fluorosilicone*
/O: Space Qualified Silicone* (non-outgassing)

* Note: Cord will match elastomer choice if included.

Ordering Information

Basic Multi-Seal is sold by the foot in approximately 25 foot lengths and typically packaged on cardboard flats except in small quantities. Not all configurations are stock items. Contact us for availability.

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