Flexi Shields
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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.

 
Spira-Shield
Quick & Ultra Quick-Shield
Flexi-Shield
Spiral:
Tin Plated BC
St. Steel
Tin Plated BC
St. Steel
Standard:
Tin/Lead or
No Plating
CSS (default)
CMS
CLS
CNI
CNM
CNL
CST
CMT
CLT
CSQ
CMQ
CLQ
Tin/Lead or Edge Plating
Option (T / E)
CESS
CEMS
CELS
CTNI
CTNM
CTNL
CEST
CEMT
CELT
CTSQ
CTMQ
CTLQ
RoHS Tin Plating
Option (IW)
CIWSS
CIWMS
CIWLS
CIWNI
CIWNM
CIWNL
CIWST
CIWMT
CIWLT
CIWSQ
CIWMQ
CIWLQ
RoHS Edge
Tin Plating
Option (EIW)
CEIWSS
CEIWMS
CEIWLS
--
CEIWST
CEIWMT
CEIWLT
--

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 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).
/E: EPDM*
/F: Fluorosilicone*
/O: Space Qualified Silicone* (non-outgassing)

* 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.

Gasket Dimensions Basic Multi-Seal Part Numbers
(Spira-Shield Gasket)
Elastomer
Thickness
A
Elastomer
Width
B
Bulb
Thickness
C
Spiral
Diameter
D
Total Gasket
Width
Standard Force* Moderate Force Low
Force
.063" .375" .125" .094" .469" CSS-0623 CMS-0623 CLS-0623
.094" .375" .187" .125" .500" CSS-0833 CMS-0833 CLS-0833
.094" .500" .187" .125" .625" CSS-0834 CMS-0834 CLS-0834
.094" .625" .187" .125" .750" CSS-0835 CMS-0835 CLS-0835

*Standard force gaskets come without a cord.

See our Part Number Matrix for assistance with part numbers, options and product comparisons.

Basic Multi-Seal
See Surface Mounting Techniques 
for mounting information.