O-ring Which cheaper? Which is good quality? Shanghai Excellent Co., Ltd. is specialized in producing sealing O-ring, all kinds of silicone O-ring, rubber O-rings, silicone O-ring, fluorine rubber O-ring, waterproof rubber O-rings and other miscellaneous pieces of the company. O-ring failure reason expansion O-ring original selection of the general fluororubber, an organic solvent in the process medium triethylene glycol having a hydroxyl group and an oxygen atom and a group attached, thus having the nature of alcohol and ether, is industrially useful as solvents, enabling expansion of the O-ring failure. Improvements to improve the O-ring O-ring: The O-ring material replacement for polytetrafluoroethylene (outer) + rubber (inner), the use of proven long-term use of PTFE still in an organic solvent environment maintain good performance, while the rubber elastic, can play a better seal. Shanghai Science and Technology Co., Ltd. Website excellent sealing: http: //www.shyqmf.com Address: Guizhou Road, Huangpu District, Shanghai No. 259