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The Siplast story is one of uncompromising quality, innovation, partnership, and commitment to our customers and their communities. Our story began in the late 1960s with a game-changing innovation: the development of SBS (styrene-butadiene-styrene) modified bitumens. This breakthrough — the result of close collaboration between Siplast Research and Development and Shell Chemical of Europe — found that the proper modification of asphalt with SBS produces a highly durable elastomeric blend with exceptional elongation and recovery properties across a wide temperature range. Since then, Siplast Engineered Roof Systems have been applied across all types of deck construction in the varied, sometimes extreme, weather conditions of 40+ countries.