Cherrit's Zincalume/Galvalume jacketing is manufactured from high tensile steel with coating of 55% aluminium, 43.5% zinc and balance 1.5% silicon by weight for superior corrosion protection.

This zinc and aluminium coating formulation was developed int he 1960's after extensive studies on improving the performance of hot-dipped galvanized products.

Moisture barrier prevents galvanic or chemical corrosion caused by contact of dissimilar metals and also soluble salts present in most industrial insulations. Cherrit recommends that all jacketing systems have a moisture barrier to avoid heavy maintenance cost due to galvanic or chemical corrosion.

POLYSURLYN MOISTURE BARRIER

consists of 3-mil co-extrusion of DuPont^™ Surlyn® and special polyethylene heat and pressure bonded to the inner surface. Conforms to BS 476 : Part 7 : 1997 Surface Spread of Flame Class 1.