Industrial Grade Heat Transfer Oil is designed for use in circulating hot oil systems and it can resist thermal cracking and decomposition. The Oil has good thermal conductivity for rapid heat transfer and maximum system efficiency. The Oil is used for open hot oil systems that operate up to 400 ° F and in closed systems up to 600 ° F. The Oil has good thermal stability that extends service life. The Industrial Grade Heat Transfer Oil inhibits sludge and varnish deposits.