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Statically
Dissipative Plastics
Statically
dissipative plastics reduce losses during the handling of electro-sensitive
devices and improve safety and reliability of packaging equipment.
Specialty polymers designated as ESd, or electro-static dissipative,
are now used regularly by equipment manufacturers and users concerned
about the unwanted build up and rapid discharge of static charge
that results from the exchange of electrons occurring when two insulative
materials rub against each other. The use of machined plastic parts
for reduced friction, sacrificial benefits, noise reduction and
elimination of external lubrication can lead to excessive dust and
dirt collection, electrical shock and even an ignition source if
consideration is not given to the risks of static charge build-up
and discharge. The earliest of these specialty products were developed
by simply including electrically conductive particulates (such as
carbon powder and/or fiber) into a variety of base resins, leading
to materials that were considered antistatic. Later came development
of highly engineered formulations designated to be used within the
semicon industry for handling sensitive electronic components such
as integrated circuits, hard drives and circuit boards. Today, both
ESd and anti-static materials find use in the electronics industry
and many more traditional material handling applications.
Distributed
by Modern Plastics, Quadrant EPP, the world's leading supplier of
engineering and high performance plastics for the machining market,
supplies electrically dissipitive materials in base resins, from
ultra-high-molecular-weight polyethylene (UHMW-PE) to PEEK and Torlon®,
in a wide range of resistivities. Each of the materials supplied
under the Semitron® trade name is formulated to maintain a specific
resistivity range while bleeding off static charge at a controlled
rate (5KV in less than 2 seconds) per MIL-B-81705C. The materials
are inherently dissipative and stable over a wide voltage range,
unlike many other "dissipative" materials that rely on surface treatments
or surface phenomenon for electrical conductivity. In addition to
the Semitron materials, anti-static materials using carbon fiber
reinforced and carbon powder formulations provide conductivity benefits
for general purpose applications in which static charge build-up
should be minimized.
-
Mike Oliveto,
Quadrant Engineering Plastics Products
an ISO 9001 Certified Company
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