HM-252 Cement Autoclave (ASTM C 151, AASHTO T 107, others) provides an accelerated means of estimating delayed expansion of Portland cement caused by hydration of CaO and MgO. Test bars are exposed to controlled steam pressure and constant temperature. Unit is capable of pressures in the 60—350psi (0.4—2.4mPa) range and includes steam vessel, pressure regulator, pressure gauge (0—600psi x 5psi), air vent valve, power switches, a safety pop valve set at 350psi, MA-421F thermometer, wrench, and package of five gaskets. Replacement gaskets, and safety pop valves are available as accessories. Autoclave chamber is 6-1/8in (156mm) IDx16in (407mm) H. Overall Dimensions: 17x48x28in (432x1220x711mm), WxDxH; 1,800 Watts/15.7 amps maximum power demand on 115 VAC supplies. For use with 230V service, order TR-3002 transformer.