タイトルまたは説明
1.Introduction
PBT is a milky white, translucent to opaque, crystalline
thermoplastic polyester with excellent mechanical properties,
electrical insulation properties, oil and chemical resistance, easy
moulding and low moisture absorption, etc. It is the most commonly
used extrusion material for the secondary coating of optical
fibers.
In the communication optical cable, the optical fiber itself is
very fragile. Although the mechanical strength of the optical fiber
has been improved after the primary coating, it is still not enough
for the requirements of the cable, so the secondary coating is
required which is the most important mechanical protecting method
for optical fibers in the manufacturing process of optical cables,
because coating not only provides further mechanical protection
against compression and tension, but also creates excess length of
optical fibers. Because of its good physical and chemical
properties, PBT is usually used as the extrusion material for the
secondary coating of optical fibers in outdoor optical cables.
We can provide OW-PBT***3, OW-PBT***5 and other grades of PBT
material for secondary coating of optical fiber cables.
2. Characteristics:
1) Good stability. Small shrinkage, small volume changes in the use
of parts, stable molding.
(2) High mechanical strength. The modulus is large, the extension
performance is good, the tensile strength is high, and the lateral
pressure value of the casing made is higher than the standard.
(3) High heat deflection temperature. Excellent thermal deformation
performance under large load and small load conditions.
(4) Hydrolysis resistance. With excellent resistance to hydrolysis,
making the life of the optical cable exceed the standard
requirements.
5) Chemical resistance. Excellent chemical resistance and good
compatibility with fibre paste and cable paste, not easy to be
corroded.
3.Application
It is suitable for the production of secondary coating of optical
fiber cables.
