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We formerly offered cement darts suitable to 120C (with p/n 1xxxxx) and
to 160C (with p/n 2xxxxx). As we have had feedback on dart usage and
performance, it is evident that the greater wear and cut resistance of
the higher temperature dart is desirable even at low temperatures. It
protects against some of the possibilities of wear and cut, especially
in tight systems, and as the rubber bonds better to the steel core,
there is reduced chance of shrugging off the rubber; bypass is thereby
limited. We had 3 or 4 reports of problems in about 150-200 hundred
darts over 2 years or so; but none with the HT darts. We therefore
now supply p/n 2xxxxx 160C darts in all circumstances.
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