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Silicone Sponge

Gum-based polydimethylsiloxane (PMDS) is used to make a majority of the commercially available silicone sponge products. The silicone elastomer expands at the time of heat curing; this expansion process leads to the closed-cell sponge structure. The biggest difference between a “foam” and a “sponge” is that foam is an open-cell while a sponge is a closed-cell.

Silicone Sponge is available in soft, medium, hard, and X- Hard densities. Medium-density is the most common one. Various colour options are available. Generally, it features a fine fabric finish on both sides of its surface and is available in o-ring cord, square cord, hollow, custom shape, and gasket sheets up to 2″ thick.

SPONGE SILICONE Cord and O-Rings - COR Manufacturing

Understanding the hardness of sponge products.

Type Extra Soft/Soft
(Chewing Gum)		 Medium Soft
(Pencil Eraser)		 Medium Hard
(Windshield Wiper Blade)		 Hard
(Skate Wheel)		 Extra Hard
(Bowling Bowl)
Shore A
Rubber, Soft Plastic & Polyurethane 
10 15 20
25 30 35
40 45 50 55 60 65 70
75 80 85
90 95 100
Shore B**
Rigid Rubber
6
12 17 22
27 32 37 42 47 51 56
62 66 71
76 81 85
Shore C**
Rubber & Plastic
9 12
14 17 20 24 28 32 37
42 47 52
59 70 77
Shore D
Hard Rubber & Plastic
6 7
8 10 12 14 16 19 22
25 29 33
39 46 58
Shore O**
Soft Rubber
8 14 21 28
35 42 48
53 57 61 65 69 72 75
79 84
Type Soft
(Slice of Bread)		 Medium Soft
(Seat Cushion)		 Medium Firm
(Mouse Pad)		 Firm
(Tennis Ball)
Shore OO
Sponge
45 55 62 70
76 80 83
86 88 90 91 93 94 95
97 98
Type Very Soft
(Slice of Bread)		 Extra Soft
(Pillow)		 Soft
(Mattress)		 Firm
(Tennis Ball)		 Extra Firm
(Styrofoam Cup)		 Very Firm
(Life Preserver)
Density
Foam		 0 - 2 PSI

0 - 14 kPa

 2 - 5 PSI

14 - 34 kPa

 5 - 9 PSI

34 - 62 kPa

 9 - 13 PSI

62 - 89 kPa

 13 - 16.5 PSI

89 - 114 kPa

 16.5+ PSI

114+ kPa

Gaskets and O-Rings made from close cell sponge silicone offers excellent sealing solution due to its number of outstanding properties.

  • silicone sponge rubber cord,
  • silicone sponge tubing,
  • silicone foam rubber gasket,
  • silicone sponge square cord,
  • silicone sponge rubber strip
  • custom extruded silicone sponge profiles – we will need a drawing.

We stock & sell high-quality medium density closed cell sponge Silicone Cord in the colour red. We can supply all standard metric sizes. We stock the following inch sizes, .139”, .156”, .188” .250”, .318”. Sizes not listed in metric and inch are available upon request.

 

Advantages

The smooth surface skin of our Closed Cell Silicone Sponge Rubber Cord, Tubing, Strips, Seal and allows very little water absorption and prevents water and dust entrance.

Silicone Sponge offers:

  • Excellent Temperature Resistance
  • UV resistance
  • Ozone resistance
  • high compression set
Black Sponge Profile cross section cor manufacturing cord

Customization

COR can supply custom silicone sponge extrusion profiles in many sizes and shapes. Send us your requirements in a dwg., pdf or even on a napkin, with dimensions and we can try and quote according to your request.

Applications

  • Food Processing Machinery Seal
  • Oven Seals
  • Door Seals
  • Lighting Fixture Gasket
  • Electrical Enclosure
  • High-Temperature Sealing
  • General Sealing in different Industries
  • Pharmaceutical Equipment
  • Hot & Cold Thermal Insulation
  • Energy Industry

Check out other materials. For any question or more information, contact COR Manufacturing.

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