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The Elastomerics Blog by Stockwell Elastomerics

Tuesday, November 05, 2013

Rogers Bisco 7000 Silicone Sponge Discontinued

Announced August 2013, Rogers Corporation has discontinued their 7000 series silicone sponge line.  Originally manufactured by the MTI Groendyk silicone group; the 7000 series products were
Traditional Silicone sponge (orange) &
RS-700 Series (grey)
sheet molded, peroxide cured, expanded silicone sponge offered in a variety of densities and formulations (see list below).  Rogers is replacing the 7000 series with an enhanced series called RS-700 .  The RS-700 products are manufactured in continuous lengths, in three firmness grades (soft, medium and firm) and are UL recognized gasket materials:  JMLU2, UL157, UL50 / UL50E for types 2, 3,3R, 3S, 4, 4X, 5, 6, 6P, 12, 12K, 13 (continuous compression and periodic recompression).

Stockwell Observations of RS-700 series
RS700 silicone sponge series has very good mechanical properties, uniform closed cell structure, and a smooth surface as compared to the “fabric” finish on traditional silicone sponge products.  The RS-700 series is offered in shades of gray (RS-720 = Fog Gray, RS-750 = Steel Gray, RS-770 Charcoal Gray).  As with all silicone offerings, Stockwell Elastomerics is capable of laminating acrylic and silicone pressure sensitive adhesives to the RS-700 series.  Lamination bonds are similar to those of the 7000 Series, Bisco Silicone Foams  and Cohrlastic Silicone sponge products.

Discontinued 7000 Silicone Sponge Line
7000 Series Silicone Sponge
7104 - Soft Silicone Sponge
7129 - Soft Flame Resistant Silicone Sponge (UL 94 HB)
7204 - Soft/Medium Silicone Sponge
7204 LCS - Soft/Medium Silicone Sponge (Low Compression Set)
7304 - Medium Silicone Sponge
7304 LCS - Medium Silicone Sponge (Low Compression Set)
7304 FDA - Medium Silicone Sponge (FDA Ingredients)
7329 - Medium Flame Resistant Silicone Sponge
7404 - Medium/Firm Silicone Sponge
7404 LCS - Medium/Firm Silicone Sponge (Low Compression Set)
7504 - Firm Silicone Sponge
7429 - Medium Flame Resistant Silicone Sponge

Replacement RS-700 Silicone Sponge Line
RS-720 Soft Silicone Sponge Sheet / Roll
RS-750 Medium Silicone Sponge Roll
RS-770 Firm Silicone Sponge Roll

Traditional Silicone Sponge Product Offerings
The RS-700 products look and feel a bit different than traditional silicone sponge products but still possess the same high performance gasket properties:  excellent compression set resistance, wide temperature range, UV/ozone resistance and good water sealing.  If traditional orange silicone sponge is required, Stockwell Elastomerics still offers Cohrlastic R-10480S and R-10470M silicone sponge products.

For more information about the RS-700 Series or traditional silicone sponge products; please contact Stockwell at 215-335-3005, or visit

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posted by Steve Hughes at 10:25 AM


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