Norprene thermoplastic elastometer tubing is a rubber-like black tubing which will not weaken or crack after years of aging, heat or ozone. Chemical compatibility approaches that of fluoroelastomer and silicone tubings but costs less. Offers superior resistance to flex-fatigue in peristaltic pumps and is heat sealable. Maximum continuous service temperature is 275°F (135°C) and embrittlement temperature is -60°F (-51°C). Durometer hardness: Shore A, 60. Packaged in lengths of 50 feet.