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 (also known as explosive decompression). Greene, Tweed’s Fusion™ 938 is a fluorocarbon elastomer specifically designed to withstand RGD in compressor components, valves and pumps. Most elastomers experience severe blistering or cracking when the forces of these expanding gases overcome the strength of the surrounding material, but Fusion™ 938 provides superior RGD resistant properties enabling seal integrity. Fusion™ 938 also offers an improved lower temperature operating window. Its compression set resistance provides superior sealing and leak prevention unmatched by the leading competitive material. In addition, Fusion™ 938 offers much better resistance to methanol, sour gas, hot water, steam and corrosion inhibitors than conventional fluorocarbon elastomers, extending seal lifetime.
Norsok defines aging and RGD tests at various gas, temperature and pressure variations.
938 was tested under the following criteria:
TotalFinaElf defines RGD tests at these gas, temperature and pressure conditions: