Greene, Tweed’s Fusion™ 935 is a fluorocarbon elastomer specifically designed for ED (explosive decompression) resistance in compressor components, valves and pumps in hydrocarbon refining, pipeline and oilfield applications. ED 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 ED. Most elastomers experience
severe blistering or cracking when the forces of these expanding gases overcome the strength of the surrounding material, but 935 provides superior ED resistant properties. Fusion™ 935 offers superior ED properties, broader chemical compatibility and an improved lower temperature operating window. For example, much better resistance to methanol, sour gas, hot water, steam and corrosion inhibitors than conventional fluorocarbon elastomers. In addition, its compression set delivers improved sealing and leak prevention
unmatched by the leading competitive material.
Because of the relationship of pressure and volume in near ideal gases, ED 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 ED is highly dependent on absolute pressures rather than the pressure change.
• Test based on Shell DODEP 02.01B.03.02 requirements.
• -214 O-rings.
• 3 cycles, consisting of a 48-hour hold at elevated pressure and
temperature. Each decompression is at a rate no less than
1000 psi/min. Entire fixture is maintained @ ambient pressure
for a minimum of 1 hour between cycles.
• Seals are constrained as a face seal with no back-up ring. Nominal
squeeze and gland fill are 17% and 77% respectively.
• Fluid media is approximately 30% CO2 (by volume), balance N2.
• Results*: Internal: 1,1 External: 1,1 (2 samples tested).