A new polymer has been introduced
by Dotmar EPP that can be used as an economical alternative to
costly high performance plastics in a variety of demanding high
tech applications.
Even when exposed to chemicals and high temperature environments,
the new Techtron HPV PPS thermoplastic offers a multi-purpose
combination of properties relative to wear resistance, load-bearing
capabilities and dimensional stability.
Applications
Typical applications for the Techtron HPV PPS can be found in
chemical process equipment (e.g. pump, valve and compressor components),
industrial drying and food processing ovens, and in the electrical
and electronics industries (e.g. high temperature insulators
and brush holders).
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Chemical Resistance
Techtron HPV PPS resists a wide variety
of organic and inorganic chemicals. Consequently, even after
prolonged exposure and at elevated temperatures, the polymer
exhibits little change in its mechanical properties. |
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Operating Temperature
Techtron HPV PPS’s maximum allowable
service temperature is 260°C for short periods and 220°C
for more than 20,000 hours of continuous use. These values
are well above
those of
most other thermoplastics and thermosets. |
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Wear
Resistance
Techtron
HPV PPS’s
overall wear resistance and low coefficient of friction
overcome the disadvantages of virgin polyphenylene sulphide,
which has a rather poor wear resistance, and of glass fibre
reinforced polyphenylene sulphide, which causes premature
wear of the counterface in bearing applications. Hence,
where unlubricated moving parts are involved, Techtron
HPV PPS’s frictional properties result in a low
heat build-up and high PV values. |
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Dimensionally Stable
Techtron HPV PPS preserves
very good dimensional stability despite temperature variations,
moisture absorption, stress relieving and chemical attack.
For instance, as an indication of the polymer’s excellent
resistance to hydrolysis, no significant change in properties
is detected even after long-term exposure to water at high
temperatures.
Due to a special annealing process after production,
Techtron HPV PPS stock shapes exhibit a favourable thermal
expansion
rate, a low level of internal stresses and a high degree of
crystallinity. This eliminates dimensional changes due to post-crystallisation
when used at temperatures above 90°C, a problem that
often occurs with injection-moulded parts.
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Availablity
Part of the Quadrant EPP family of engineering
plastics materials, Techtron HPV PPS is available in
rods (10 - 100 mm diameter), plates (10 - 50 mm thick)
and tubes (60 - 100 mm OD). All Quadrant EPP polymers
are manufactured within the ISO 9002-certified quality
system, and are available as engineered stock shapes
through a network of authorised Dotmar EPP distribution
centres in all States. |
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Additional key benefits include a high mechanical
strength, stiffness and hardness; good electrical insulating
and dielectric properties
(which are only marginally affected by changes in temperature,
frequency or humidity); inherent low flammability; very good
resistance against high energy radiation and moderate impact
strength.
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