Chemical Analysis of Heat Transfer Oils
Heat transfer oils are primarily used in large bakeries. The oils used under high temperatures display certain aging with time in the form of deposits of solids (products of aging in the form of very fine particles and sediments), reduction of the flash point (due to cracking products; oil occasionally becomes disintegrated due to the high temperature).
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Typical Test Parameters of Heat Transfer Oils
- Viscosity, kinematic at 20°C, 40°C, 100°C
- Coke residue
- Insoluble parts (filtration)
- Simulated distillation (GC-SimDis), distillation range, highly-volatile parts
- Acid values (neutralisation number NZ, total acid number TAN)
- Flash point (COC, Pensky Martens, Grabner)
- Combustion point
Famous Representatives
Shell Thermia A
Heat transfer oil for forced circulation systems up to a max. 250°C flow temperature or max. 280°C film temperature. Especially suited for systems with intermediate cooling procedures and start-up at low temperatures. Meets the DIN 51522 requirements.
Shell Thermia B
Heat transfer oil for forced circulation systems up to a max. 320°C flow temperature or max. 340°C film temperature. Meets the DIN 51522 requirements.
Shell Cassida HT 32
Shell Cassida HT 32 is a synthetic heat transfer liquid for closed and pressure-free heat transfer systems in the foodstuffs industry. It completely meets (basic liquid and additives) all quality requirements of the FDA, Group 21 CFR 178.3570 (lubricants with incidental food contact). Furthermore, the finished product has the NSF H1 permit (former USDA H1). A max. film temperature of up to 340°C can be used.
Marlotherm SH
Mobiltherm 603
BP Transcal 65
Fragol Therminol 59
Detailed information/lists and permitted flow and film temperature available under: