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Item Code: RC02100

Closed Cell Neoprene Sponge Rubber

Neoprene Sponge Rubber

Expanded rubber is the technically correct term for closed cell sponge rubber.  The cells are like individual balloons, holding gas and not allowing moisture to pass through as long as the cell wall has not burst. The raw compound is mixed on the same type of equipment used to mix solid rubber compounds but with a chemical blowing agent added.  Under the heat and pressure of a pre-cure or pre-forming process, this additive decomposes and mixes with the rubber compound and generates nitrogen gas.  As this reaction is occurring, the mixed batch is placed into an oven and allowed to expand into a bun from 2″ to 4″ thick. The bun of closed cell sponge rubber is then aged and split into sheets typically from .062″ thick and greater.

Constant deflection of closed cell sponge rubber may cause the gas to permeate through the cell walls. Over compression of the closed cell sponge such as beyond 50 – 70% deflection, may cause the cells to burst.  When a closed cell sponge gasket has been over compressed, the gasket may rebound very slowly, or not at all, compromising the integrity of the gasket.  Most closed cell sponge gaskets should be deflected 20 – 35% for optimal sealing performance.  These properties are discussed in ASTM D1056, ASTM D6576 and Mil-R-6130C.

Key features:

  • Closed cell structure creates air and water tight properties 
  • Good flexibility 
  • Resistance to ozone, UV, light and oil 
  • Density range from 140-190kg/m3

What applications can neoprene sponge be used for?

  • Excellent seal against water and dust 
  • Good sound and thermal insulation 
  • Weather strips 
  • Energy absorbers
  • Closure seals  

Produced from 100% neoprene polymer, most closed cell neoprene sponge products meet UL 94HF-1 flame rating.  They are generally serviceable from -40°F to 158°F continuous and withstand 200°F intermittently.  Premium closed cell neoprene sponge products will resist light oil contact, ozone, alkalis and acids, making them a good choice for general enclosure door gaskets.

RC02100 – TRC05 (1410)

RC02100 – TRC05 (1720)

The Rubber Company

Unit 27 Romsey Industrial Estate

Greatbridge Road



SO51 0HR

United Kingdom

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