Silicone gasket 1) gas tightness well 2) FDA, SGS, LFGB 3) Chemical resistance 4) temperature range:-30-230centigrade ... and low temperature.4. Our rubber products can approved by FDA, SGS, REACH, LFGB. According to clients demand.5. All rubber ... with 11 years experience.7. Any questions, welcome to contact us. FDA/LFGB Silicon O Ring