Cherrit's Aluminum Roll Jacketing is manufactured from Type 3003, 3004, and 1060 Alloys and Temper H-14 through H-19, conforming to ASTM-B209. They are available in a smooth finish or a stucco embossed pattern and either finish can come with 5mm (3/16") corrugations.
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.
Types of Moisture Barrier
POLYKRAFT MOISTURE BARRIER - consists of 1-mil thick polyethylene and 40# natural kraft paper (approx 3.5mils) heat and pressure bonded to the inner surface.
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.
