Flexi Shields
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“D” Multi-Seal is a groove-mounted gasket with a bulbous silicone elastomer for an excellent environmental seal. It comes standard with the Spira-Shield for superior shielding quality or can be ordered with any other spiral material. See below for ordering information.

Application Information

This combination EMI and environmental gasket is ideal for applications that need excellent sealing and have somewhat limited space or want to utilize a groove-mount solution (For surface mount applications, refer to the Basic Multi-Seal data sheet.)

Materials:
Spiral: Spira-Shield, Tin/lead plated beryllium copper.
Elastomer: Solid silicone rubber, 40 durometer on -0421 & -0632; 60 durometer on all other sizes. 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:
"D" Multi-Seal gaskets come in two different resiliencies 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.

Mounting:
This gasket is groove mounted. Refer to Groove Mounting Techniques for detailed mounting information.

Available Options

Spiral Material:
“D” 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.

1. Choose the desired gasket from the table on page 13 based on size and force.
Example: DMS-1263, moderate force, E=.375”, D=.187”

2. Substitute the prefix from the table below based on spiral material and plating.
Example: DEMT-1263, moderate force Flexi-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
DSS (default)
DMS
DNI
DNM
DST
DMT
DSQ
DMQ
Tin/Lead or Edge Plate Option (T/E)
DESS
DEMS
DTNI
DTNM
DEST
DEMT
DTSQ
DTMQ
RoHS Tin Plating
Option (IW)
DIWSS
DIWMS
DIWNI
DIWNM
DIWST
DIWMT
DIWSQ
DIWMQ
RoHS Edge
Tin Plating
Option (EIW)
DEIWSS
DEIWMS
--
DEIWST
DEIWMT
--

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

Example: DEIWSS-1263; “D” Multi-Seal, RoHS edge plated, Spira-Shield gasket, Standard force (No cord by default)

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: DMS-1263 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:
"D" Multi-Seal is sold by the foot in 10 foot lengths. Custom o-rings are also available. (See Custom Gaskets for more information.)

Gasket Dimensions "D" Multi-Seal Part Numbers Recommended Mounting Dimensions
Width of Gasket
E
Spiral Diameter
D
Thickness of Wall
t
Standard Force** Moderate Force Low Force Depth (L)
+.002"
-.000"
Width (G)
+.007"
-.005"
Width (W)
+.000"
-.002"
.141" .063" ± .003" N/A* DSS-0421 DMS-0421 -- .046" .187" .138"
.187" .094" ± .004" N/A* DSS-0632 DMS-0632 -- .070" .250" .180"
.250" .125" ± .004" .031" DSS-0842 DMS-0842 -- .094" .313" .240"
.375" .187" ± .006" .047" DSS-1263 DMS-1263 -- .140" .500" .367"
.500" .250" ± .007" .047" DSS-1684 DMS-1684 -- .188" .625" .485"

*These sizes come with a solid elastomer.
**All standard force gaskets come without a cord.

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

diagram of d multi seal Spira D Multi Seal Spira D Multi Seal
See Groove Mounting Techniques for mounting information. You can use either a dovetail or conventional o-ring groove.
More information is available on Dovetail Groove Cutters.