X-Pando Products Company is the manufacturer of unique sealing compounds that expand as they set. Use on most threaded pipes and fittings for most liquids, gases, and liquid gases at high pressures and temperatures. Non-toxic, UL® Certified to NSF/ANSI 61 & 372. Meets requirements of FDA, USDA, NASA, and API. Also X-Pando Special No. 2 for use on cement lined pipes to be welded.