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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 (shown below) includes a Spira-Shield gasket for superior shielding. See below for ordering information.

Application Information

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, refer to Custom Gaskets for complete details. For groove mount applications where you need environmental sealing, refer to our "D" Multi-Seal data sheet.

Materials:
Spiral: Spira-Shield, Tin/lead plated beryllium copper.
Elastomer: Solid silicone rubber, 60 durometer.
(See Options for RoHS compliance or other material choices.)
Refer to Material Specifications for more information.

Shielding Quality:
This gasket offers shielding quality from 86 dB to 165 dB. The shielding quality may vary depending on your specific application. Refer to Shielding Quality for more complete performance data.

Compression Force:
Basic Multi-Seal gaskets come in three different resiliencies (as shown below). 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.

Mounting:
This gasket is surface mounted. Refer to Surface Mounting Techniques for detailed mounting information.

Available Options

Spiral Material:
Basic Multi-Seal comes standard with a tin/lead plated Spira-Shield gasket. Other spiral materials or plating may be specified by choosing a different prefix from the following table. See pages 1-10 for more information on the Spiral materials.

1. Choose the desired gasket from the table on page 15 based on size and force.
Example: CMS-0835, moderate force

2. Substitute the prefix from the table below based on spiral material and plating.
Example: CESIMS-0835, moderate force Enduro-Shield, edge tin/lead plated BC.

Specify a different spiral material by choosing the desired prefix from the table.

Example: CIWST-0833; Basic Multi-Seal, Flexi-Shield RoHS Tin plated beryllium, copper gasket, Standard force (Includes cord)

Cord Insert:
Standard Force gaskets come without a cord. Moderate and low force gaskets come standard with PVC cord to protect the spiral from over-compression. Specify “no cord” in moderate and low force gaskets as follows:
NC: No Cord (Example: CMS-0835 NC)

Special Cord:
Special cords including solid fluorosilicone, solid silicone and thermal plastic rubber are available in some sizes. Please contact us for details.

Special Elastomer:
The standard elastomer is solid silicone. A special elastomer can be specified as shown below (available in certain sizes only).
/E: EPDM
/F: Fluorosilicone
/O: Space Qualified Silicone (non-outgassing)

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.

See Surface Mounting Techniques  for mounting information.