Cast nylon is produced by melting caprolactam and catalysts in exact proportions and casting it into heated molds. During polymerization, the material undergoes a density change and shrinks by 15%, allowing it to be easily removed from the molds. Caprolactam has a density of 1.0 like water before melting, and the resulting cast nylon has a higher density of 1.15 due to the chemical reaction that occurs during casting.

1. Cast
Nylon
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Cast nylon is produced from
caprolactam with a density equal to 1.0,
comparable with water.
Caprolactam is melted in
exact proportion with catalyst and
activator, mixed and cast into heated
molds.
A rapid reaction follows and a density
change during polymerization results in
a highly crystalline plastic with a
density of 1.15. As a result, shrinkage of
15% occurs enabling the casting to be
stripped from the mold.

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