epiSPAN

EPDM: The polymer EPDM, ethylene-propylene rubber, is produced through copolymerization of ethylene, propylene and diene monomer, producing a polymer madeup of saturated linear macromolecules with a paraffinic structure.

In addition to the base polymer, EPDM contains reinforcing carbon black fillers, process chemicals, antioxidants and vulcanizing agents. After mixing the ingredients into ahomogenous plastic compound, two layers of the rubber are rolled out in a calendar toform a double sheet. Vulcanization is then carried out. The long rubber molecules in the material are cross-linked through heat and pressure, creating an elastic membrane.

EPDM easily surpasses any other roofing material available today in terms of performance characteristics and long term weatherability. Excellent weather, ultra-violet, ozone resistance and full flexibilitybetween -50 to 150 degrees Celsius are only some of the properties which make EPDM the ideal roofing material for the extremes of the New Zealand climate.