Greene, Tweed’s Fusion ™ 936 is a fluorocarbon elastomer specifically designed for Rapid Gas Decompression (also known as explosive decompression) resistance in downhole, surface and subsea oilfield equipment. RGD (rapid gas decompression) is a phenomenon that often occurs when high-pressure gas molecules migrate into an elastomer at a compressed state. When the pressure surrounding the elastomer is suddenly released, the compressed gas inside the elastomer tries to expand and exit the elastomer, thus causing RGD. Most elastomers experience severe blistering or cracking when the forces of these expanding gases overcome the strength of the surrounding material, but 936 provides superior RGD resistance.
Fusion ™ 936 also offers an expanded temperature range and chemical resistance not previously seen in RGD resistant fluoroelastomers. For example,Fusion ™ 936 exhibits better resistance to methanol, sour gas, hot water, steam and corrosion inhibitors than conventional fluorocarbon elastomers. In addition, its lower compression set delivers improved sealing and leak prevention unmatched by
Because of the relationship of pressure and volume in near ideal gases, RGD damage is realized near the lower end of a decompression cycle. If the gases trapped in the elastomer are assumed to be ideal, the damage due to RGD is highly dependent on absolute pressures rather than the pressure change. (See below for sample of test results.)