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How To Fasten Rubber To Wood And Metal

As rubber plates and rings are
nowadays used almost exclusively for making connections between steam
and other pipes and apparatus, much annoyance is often experienced by
the impossibility or imperfection of an air-tight connection. This is
obviated entirely by employing a cement which fastens alike well to the
rubber and to the metal or wood. Such cement is prepared by a solution
of Shellac in Ammonia. This is best made by soaking pulverized Gum
Shellac in ten times its weight of strong Ammonia, when a slimy mass is
obtained, which in three or four weeks will become liquid without the
use of hot water. This softens the rubber and becomes, after
volatilization of the Ammonia, hard and impermeable to gases and

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