... electric car, the cycle tube thermostablly, the production tire tube, bears the aging, gas tightness high, 180 ... days not to need to gasify. The tire tube tensile strength 9.0↑, elongation ratio 500↑ ... gas tightness is natural gum tire tube's 4 times,fast builds up -> the ... the tire tube produces, can satisfy the people to the tire tube gas tight request. bike motor butyl ...