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@zielonek1000: "The common metals are not affected by anhydrous ammonia. But, even if there is a little moisture, ammonia will react rapidly with copper, brass, zinc and many alloys, especially those containing copper and corrode them. Besides moist ammonia will not react with iron or steel. Therefore only steel or ductile iron should be used for ammonia systems, ammonia containers, valves, fittings and piping. "
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