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FAQ

Technical / Tolerances
  • I'm working on a control drawing for a silicone gasket using silicone sponge.  What tolerance should I specify to ensure quality products and avoid needless quality issues in receiving?

    • Silicone sponge and silicone foam are compressible materials.  While our tools are precise, tight tolerances should be avoided.  The table below will provide a guide for thickness tolerance.  Tolerance for position of holes should be +/- .062" (+/-1.6 mm).

Silicone Sponge or Foam Thickness

Tolerance

Fraction

Inch

Millimeter

Inch

Millimeter

1/32"

.031"

.79 mm

+ .010"    -.010"

+.25mm   -.25mm

1/16"

.0625"

1.59 mm

+.016"   -.016"

+.41mm   -.41mm

3/32"

.09375"

2.38 mm

+.016"   -.016"

+.41mm   -.41mm

1/8"

.125"

3.18 mm

+.032"   -.032"

+.81mm - .81mm

3/16"

.1875"

4.76 mm

+.032"   -.032"

+.81mm - .81mm

1/4"

.250"

6.35 mm

+.047"   -.032"

+1.19mm - .81mm

3/8"

.375"

9.53 mm

+.047"   -.047"

+1.19mm   -1.19mm

1/2"

.500"

12.7 mm

+.047"   -.047"

+1.19mm   -1.19mm

3/4"

.750"

19.05 mm

+.075" - .075"

+1.91mm   -1.91mm

1"

1.0"

25.4 mm

+.100   -.100"

+2.54mm   -2.54mm
  • What is the unit of measure for density for silicone sponge or foam and how does it relate to compressibility?
    • Density is the weight of the material per unit volume.  The higher the density the harder the material.  Lower density materials are lighter in weight. 

Type

Density

Compressibility

Products

PCF

lb/ft3

grams/cc

kg/M3

Force To Compress 25%

PSI

 lb/in3

kPA

Silicone Foam Soft

12

.19

192

3

21

V23-000 Web Page

V23-000 PDF Specs

Silicone Sponge Soft

21

.32

332

5

34

V22-200 Web Page

V22-200 PDF Specs

Silicone Sponge Medium

29

.47

471

10

69

V22-100 Web Page

V22-100 PDF Specs

Silicone Sponge Firm

43

.69

692

16

110

V22-110 Web Page

V22-110 PDF Specs

 
  • What is compression set and what exactly does it mean?
    • The time and temperature of the application will cause the material to take some set based on the material being compressed.  The Compression Set is measured in % with 0% meaning no set has taken place.  The lower the value the better.  Compression Set is measured in max % of set when the material is subjected to the industry standard test method of 22 hours with 50% compression at 212F (100C).  Please see the data sheets for details available here.

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