Thermoplastic materials are distinguished from thermoset materials in that there is no chemical crosslinking. These roofing membranes can be repeatedly softened by heating or hardened when cooled. Because of the materials’ chemical nature, thermoplastic roofing membranes typically are seamed by heat welding with hot air or solvent welding.
TPO membranes are produced by calendering with lamination, extrusion with lamination, or extrusion-coating techniques. TPO sheets are a blend of polypropylene and ethylene propylene polymers and usually are reinforced with polyester. TPO sheets contain colorant, flame retardants, UV absorbers and other proprietary substances to achieve desired physical properties.
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