Greases for very high temperatures (VHT) or Ultra High Temperatures (UHT) can be used in service at continuous temperatures ≥200°C and can withstand peaks of 300°C. These conditions require special chemistries, very different from traditional mineral greases.
Description Lubrication at temperatures >200°C is very often poorly controlled. Use of traditional or even synthetic greases is not enough, or requires almost daily topping up. To resist decomposition or strong evaporation of the base oils at these extreme temperatures, the solution is to employ non-conventional chemistries. The thickener should be infusible or show a dropping point close to 300°C.
Very High Temperature VHT greases thus conserve sufficient viscosity to effectively lubricate the mechanical elements.
Under still more extreme conditions, it is preferable to use pastes highly charged with solids (graphite, copper, zinc,…). The grease is thus only a vector to give a uniform deposit of a dry lubricant to protect the equipment.
Very high temperature greases are particularly suitable for lubrication of elements such as:
Oven fan bearings
Bearings for pre-heater rollers
Conveyors, industrial painting lines
Oven racks and furnace hearth rollers
Sun Chem very high temperature greases use non-conventional chemistries
Thickener infusible or with a very high dropping point
Base oils showing exceptional resistance to oxidation
Thermal and mechanical stability
No formation of lacquer, no coking
Very high temperature greases allow not only lubrication at temperatures of the order of 280°C but also lifetime greasing in the range of -25° to 180°C.
Lithium Complex Grease
Calcium Sulphonate Complex Grease
HT XX grease
Polyurea Based Synthetic Grease
High Temperature Grease
Graphite, Lithium, Moly
Grey, White, Yellow, Red
Excellent Sealing Capability, Extreme Pressure, High Performance, Long Shelf Life, Rust Protective, Soft Texture