The packing assembly was subjected to an EPA Method 21 leakage test with over 100,000 mechanical cycles of operation, and a packing leakage of less than 500 ppm was obtained using {HEAD ~ methane} as {TAIL ~ the test fluid} 
The packing assembly was subjected to an EPA Method 21 leakage test with over 100,000 mechanical cycles of operation , and a packing leakage of less than 500 ppm was obtained using { HEAD ~ methane } as { TAIL ~ the test fluid }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL