Gutta percha is a tough horny substance which is essentially non-elastic. It
is a crystalline material which can exist in two forms. As obtained from the
tree it is in the α-form (m.p. 65°C); rapid cooling of the melt gives the β-form
(m.p. 56°C). The β-form slowly reverts to the α-form.
使用
Gutta percha has a lower water absorption
than natural rubber and is a good dielectric. On account of these
properties, gutta perch a was once used for underwater cable insulation but it
has now been displaced by newer materials.
製造方法
Balata is obtained from the latex of trees grown mainly in Central America.
The coagulated material consists of approximately equal amounts of high
trans-l,4-polyisoprene and resins.
