Flexi Shields
Download datasheet in pdf format

Our Spira-Strip gasket includes a solid silicone elastomer to surface mount the gasket and provide an environmental seal if needed. The standard configuration (shown below) includes a Spira-Shield gasket. See below for ordering information.

Application Information

This gasket is made by attaching our Spira-Shield to a solid silicone elastomer which holds the spiral in place. The elastomer can be used to achieve an environmental seal of up to one atmosphere! This gasket can also be made into a custom Framed Gasket to your specifications. (See page 34). (See Custom Gaskets for more information.)

Materials:
Spiral: Spira-Shield, Tin/lead plated beryllium copper.
Cord: 80 durometer PVC (hard plastic).
Elastomer: 40 durometer solid silicone rubber.
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:
Spira-Strip gaskets come in three different resiliencies (as shown below). Optimal compression of the gasket is 25% of the diameter of the spiral. The compression forces shown are approximate.
Standard Force: ~30 pounds per linear inch compression.
Moderate Force: ~10 pounds per linear inch compression.
Low Force: ~1.5 pounds per linear inch compression.

Note: The force to achieve an environmental seal is significantly greater than that required for the EMI seal.

Mounting:
This gasket is surface mounted and held in place either by punching holes in the elastomer and securing it with fasteners or by gluing the elastomer using an RTV adhesive. When using glue, take care to keep it off the spiral! Refer to Surface Mounting Techniques for detailed mounting information.

Available Options

Spiral Material:

 
Spira-Shield
Quick & Ultra Quick-Shield
Enduro-Shield
Flexi-Shield
Spiral:
Tin Plated BC
St. Steel
Tin Plated BC
St. Steel
Tin Plated BC
St. Steel
Standard:
Tin/Lead or
No Plating
SS (default)
MS
LS
NI
NM
NL
SISS
SIMS
SILS
SINI
SINM
SINL
ST
MT
LT
SQ
MQ
LQ
Tin/Lead or Edge Plating
Option (T / E)
ESS
EMS
ELS
TNI
TNM
TNL
ESISS
ESIMS
ESILS
SITNI
SITNM
SITNL
EST
EMT
ELT
TSQ
TMQ
TLQ
RoHS Tin Plating
Option (IW)
IWSS
IWMS
IWLS
IWNI
IWNM
IWNL
IWSISS
IWSIMS
IWSILS
IWSINI
IWSINM
IWSINL
IWST
IWMT
IWLT
IWSQ
IWMQ
IWLQ
RoHS Edge
Tin Plating
Option (EIW)
EIWSS
EIWMS
EIWLS
--
EIWSISS
EIWSIMS
EIWSILS
--
EIWST
EIWMT
EIWLT
--

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

Example: TNL-0523 NC /S; Spira-Strip wtih Ultra Quick-Shield Gasket, Low Force, No 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: MS-1043 NC /S )

Special Elastomer:
Spira-Strip gaskets come with a solid silicone elastomer. Occasionally, because of an environmental requirement, solid neoprene is needed. Because neoprene doesn’t last as long as silicone, we don’t recommend it in normal use, but you can specify it by dropping the “/S” in the part number. (For sponge elastomers please refer to the Quick-Strip data sheet .) A solid fluorosilicone elastomer is also available on special request.

Adhesive Backing:
Some sizes can be configured with an adhesive tape backing for easy attachment. Please contact us for details.

Ordering Information:
Spira-Strip is sold by the foot and typically packaged on cardboard flats except in small quantities. It can also be ordered cut-to-length in specific sizes or you can cut it yourself using a sharp pair of scissors.

Gasket Dimensions Spira-Strip Part Numbers
(Spira-Shield Gasket)
Elastomer
Thickness
(A)
Elastomer
Width
(B)
Spiral Diameter (D) Total Gasket Width Standard Force* Moderate Force Low Force
.063" .250" .078" .328" SS-0522 /S MS-0522 /S LS-0522 /S
.375" .453" SS-0523 /S MS-0523 /S LS-0523 /S
.500" .578" SS-0524 /S MS-0524 /S LS-0524 /S
.625" .703" SS-0525 /S MS-0525 /S LS-0525 /S
.094" .250" .109" .359" SS-0732 /S MS-0732 /S LS-0732 /S
.375" .484" SS-0733 /S MS-0733 /S LS-0733 /S
.500" .609" SS-0734 /S MS-0734 /S LS-0734 /S
.625" .734" SS-0735 /S MS-0735 /S LS-0735 /S
.125" .250" .156" .406" SS-1042 /S MS-1042 /S LS-1042 /S
.375" .531" SS-1043 /S MS-1043 /S LS-1043 /S
.500" .656" SS-1044 /S MS-1044 /S LS-1044 /S
.625" .781" SS-1045 /S MS-1045 /S LS-1045 /S

* Standard force gaskets come without a cord.

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

drawing of a shield Spiral on solid silicone elastomer.
See Surface Mounting Techniques for mounting information.