... belts, rollers, burner parts, refractory supports, retorts and oven linings, fans, tube hangers, baskets and trays to hold ... concentrated acids, ammonia and sulfer dioxide; contact with hot acetic and citric acid.310/310S(S31000/ ... , rollers, burner parts, refractory supports, retorts and oven linings, fans, tube hangers, and baskets and trays ... , they are used in contact with hot acetic and citric acid