New Poly Super
Sulfones (PSS)
Redefine High-end Engineering and
Consumer Applications
Being amorphous, both these polymers offer
extraordinary dimensional stability, in
addition to outstanding mechanical properties,
even at elevated temperatures.
Need for PSS
In the last few years there has been a
consistent need for an amorphous,
transparent polymer, for applications where the product needs to withstand
temperatures up to 250°C and with
high toughness. To date, no such polymer
was available in the world, which
could withstand such high temperatures.
Two such plastics are the PSS-B
and PSS-T range of Polysuper Sulfones.
The PSS-T extends the polymer
bearing temperatures and show
significantly improved mechanical
properties especially the impact
strength and toughness and are amber
yellow transparent in nature. Being
amorphous, both these polymers
offer extraordinary dimensional stabil-ity, in addition to outstanding mechanical
properties, even at elevated
temperatures. Both these new
Polysulfones being thermoplastic in
nature can be readily processed on
conventional injection moulding, into
intricate shapes.
Growing Demand
While the Tg (222°C) and so the
continuous use (RTI) temperature
properties of PSS-B polymer are
similar to PES, it is designed to work
in applications, where PES and PSU
both fail due to their lower stress
crack or impact or temperature or
chemicals/hydrolytic resistance.
These requirements mostly pertain
to applications in medical trays,
microwavable food trays, auto-lamp
reflectors, electrical motor insulation
films, cable and wire insulation,
etc. PSS-B outshines PES and PSU
in all these applications due to its
outstanding impact properties, hydrolytic
stability, autoclavability
and stress crack resistance while
moulding large intricate articles.
PSS-B also replaces in many applications,
Polyether Imide (PEI),
which is currently used in the aforesaid
applications. Some of the applications,
mentioned here are for
food serving and cooking, where repeated
use is needed.
The PSS-T, Polysuper Sulfones,
on the other hand, are high heat resistance
plastics, which have a Tg
of 270°C and a maximum continuous
application temperature (estimated)
rating of 240°C. They are designed
to withstand high temperature
transparent applications, like in
the BIS (Burn In Socket) and electrical
motor insulation films. They
can replace plastics like PPS
(Polyphenylene Sulfide), which has
low impact, is opaque and is crystalline
and thus not having good dimensional
stability and Polyimides
(PI) in film/ tape electrical insulation
applications.
Besides injection moulding, and
extrusion, the PSS can also be formulated
to be used in coatings, for example,
non-stick cookware applications,
where higher temperature resistance
properties are desired. Having
....contd.
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