MultiTherm IG-4 heat transfer fluid replaces the company's IG-2 fluid. The new fluid is nontoxic and designed for use in closed-loop, liquid-phase heating systems up to 600oF (316oC) and in open systems where the hot fluid is in contact with air, up to 350oF (177oC). In the chemical process industry, this fluid can be used in central hot oil systems to heat many types of process equipment. Circle 207, MultiTherm Corp., (800) 225-7440, www.multitherm.com.