How is Solid Rubber Different from Sponge Rubber?

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How is Solid Rubber Different from Sponge Rubber?
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• Solid rubber and sponge rubber are molded into a
  number of products used for sealing, insulation
  and cushioning. While both the types of rubber
  are made of the same material there is a
  difference between them. Sponge rubber has
  balloon like interconnected cells holding air in
  them or letting it pass through. However, solid
  rubber is not so with regard to its cellular
  structure.
• A lot of manufacturers are into sponge rubber
  molding and solid rubber molding process to
  produce several useful products.
• What is solid rubber used for?
• They are used widely as truck bumpers, shock
  absorbers, anti-vibration pads for automobiles
  and machines. Solid rubber anti-vibration pads
  are helpful in minimizing the damage caused to
  the mechanical parts of equipments. Gaskets and
  seals including oil seals are also made from
  solid rubber.

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• What is sponge rubber used for?
• Products made from sponge rubber are used for
  soundproofing, shock absorption, weather
  stripping, cushioning, thermal insulation and
  reducing vibration. Apart from that it is used
  for filters and custom gaskets.
• The applications of products made by sponge
  rubber molding and solid rubber molding are wide
  and varied. There are also products made with
  rubber to metal bonding that are used
  extensively.
• Both solid rubber and sponge rubber are basically
  rubber. Sponge rubber holds air or lets it pass
  through unlike solid rubber. Sponge rubber
  molding and solid rubber molding products have
  lots of uses.

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