Sunoco HTO 21 is a mineral oil bases heat transfer lubricant that is used in industrial closed system heat transfer systems. Sunoco HTO series is manufactured by Sunoco Lubricants from highly refined base stocks that are resistant to thermal cracking and chemical oxidation. 21 represent the thickness of the oil which falls between an ISO VG 32 and 46 viscosity grade.
Sunoco Heat Transfer Oils can handle constant fluid temperatures in closed systems of 550º F, with intermittent and spot temperatures of 600º F.
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