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TPO (Thermo-plastic Polyolefin)

It is relatively new in the roofing market but has a high return for its cost. EPDM is a synthetic rubber while TPO is a rubber-like plastic. Lightweight, completely waterproof, resistant to punctures and tears and highly flexible (important when considering the temperature fluctuations of winter and summer). TPO also is available in white colour resulting in a highly reflective surface that can save you heating and cooling costs. Some manufacturers of TPO roofing materials also market it as “seamless” due to the hot-air welded seams – a much stronger alternative to adhesives.

TPO is typically based on polypropylene and EP (ethylene-propylene) rubber polymerized together using state-of-the-art polymer manufacturing technology. This technology enables the production of TPO membranes that are flexible at low temperatures without the use of polymeric or liquid plasticizers.

Unlike some other popular thermoplastic roofing membranes, the TPO polymer does not contain chlorine and no chlorine-containing ingredients are added during sheet production. This lack of chlorine allows TPO marketers to advertise their membrane as an environmentally safe, “green” product.

The TPO resin is compounded with other components including a weathering package, fire retardants and pigments for color to create a product that can withstand the elements associated with rooftop exposure. Sheet are available in varying widths up to 3.66m and membrane thickness is typically 1.1 or 1.5 mm although membrane up to 2.0 mm is also available.







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