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SPEC's ARN-3
Acid Resistant Roll Covering Compound |
ARN-3 Acid Resistant Roll Covering Compounds are proprietary compounds formulated from chloroprene based elastomers that have been modified by the addition of a molecularly cross linked tri-functional
plastic that is completely inert with regard to resistance to various acids and bases. This, in turn, allows the ARN-3 roll cover to function in highly oxidizing environments such as those involving Hydrofluoric, Nitric and/or Chromic Acid solutions.
In addition to its good chemical resistance, ARN-3 is superior to the chloro-sulfinated polyethylene -trade name Hypalon- compound traditionally used in these operating environments. ARN-3 is not thermoplastic and it will not soften or deform causing cover delaminations. It is also compounded to have better bonding characteristics which allow the cover to stay on the roll body longer, unless the roll is subjected by overloading, line wrecks or other abnormal abuse. The operating temperature should not exceed 225° F (115° C) ambient and the durometer range is 80/90 Shore 'A'.
The single largest operating advantage, except for its acid resistance, is ARN-3's ability to remain thermally stable under the pressures of Hysteresis - the normal molecular build-up of heat caused by the continuous contraction and expansion of the rubber under operating conditions. This allows the material to keep its original durometer; therefore, it will remain on the core longer. Ecologically, ARN-3 contains no heavy metals, especially lead, and is easily disposed after use (most Hypalon compounds contain lead).
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