A synthetic rubber with properties which resist ageing from heat, sunlight and ozone. It has excellent gas impermeability and remains flexible at low temperatures. Butynol is manufactured by combining the petroleum gases isobutylene and isoprene at the extremely low temperature of -100 ℃. (Rubber Technology-Morton) Butynol is marketed by Ardex as a warranted roofing and tanking product and fixed by their trained and experienced Approved Applicators