Typical Properties of Extra-firm Density Closed Cell Silicone Sponge

Description: Extra-firm density closed cell silicone sponge material designed for use in gaskets applications that require an extra-firm compressible material. Extra-firm d density closed cell silicone sponge offers resistance to low and high temperatures and provides users with a service temperature of -103°F to +450°F. This Material is UV and ozone resistant and takes a low compression set. Extra-firm density closed cell silicone sponge is formulated to meet the physical requirements of ASTM D1056, and MIL-STD 670.

M&P Sealing’s closed cell silicone sponge gasket material is available in a wide range of densities from soft to extra-firm with varying densities and formulations available in between. Extra-firm density closed cell silicone sponge can be converted into rolls ranging from 1/4″ wide up to 36″ in width. Available, in many colors, the surface of has a fine fabric finish on both sides and can be manufactured in thicknesses ranging from as thin as 1/32″, to as thick as 2″. M&P Sealing has the ability to supply extra-firm density closed cell silicone sponge without adhesive or with either our standard acrylic adhesive or our high-temperature acrylic adhesive. M&P Sealing has the capacity to fabricate extra-firm density closed cell silicone sponge by die-cutting or waterjet cutting to meet your requirements from the design stage through the production phase.

Specifications

ASTM D 1056
MIL-STD 670

Physical Property Test Method Limits Unit of Measure Typical Values
COMPRESSION DEFLECTION ASTM D 1056 24 +/- 6 psi 25
DENSITY
(Under 1/4″ Thick)
(Over 1/4″ Thick)		 ASTM D 1056 .035 Max.
.030 Max.		 pci .033
.028
THERMAL CONDUCTIVITY ASTM F 433 N/A in/hr/ft2/°F .85
WATER ABSORPTION* ASTM D 1056 * 5% Max. % 5
COMPRESSION SET
(22 HRS. AT 212°F)		 ASTM D 395 60% Max. % 35
ELONGATION ASTM D 412 N/A % 250
TENSILE STRENGTH ASTM D 412 N/A psi 300
DIELECTRIC STRENGTH (APPROX.) N/A N/A Volts/mil 150
BRITTLE POINT ASTM D 746 -67°F
-55°C		 °F
°C		 -103°F
-75°C
LOW-TEMPERATURE ASTM D 573 N/A °F
°C		 -103°F
-75°C
HIGH-TEMPERATURE ASTM D 573 N/A °F
°C		 450°F
232°C
*Note – Test samples prepared have skin on all sides in accordance with ASTM D3183, as allowed per ASTM D1056
This information is furnished as a guide for selecting materials. M&P Sealing Inc. disclaims liability for results or use of this information. It is the customer’s responsibility to obtain and test samples when determining the suitability of material for a particular application.

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