Overview
High and medium temperature grease is a critical lubricant formulated to withstand extreme thermal conditions without breaking down. Unlike conventional greases, these specialized products maintain their viscosity and lubricating properties even under prolonged exposure to heat, making them indispensable in industries like metallurgy, glass manufacturing, and energy production. These greases typically use synthetic base oils (e.g., polyalphaolefins or silicones) thickened with heat-resistant compounds like polyurea or lithium complex. The formulation often includes additives for oxidation inhibition and anti-wear protection, ensuring long service life in demanding environments.
Physical and Chemical Properties
The defining characteristic of HT/MT grease is its thermal stability. High-temperature grades can typically operate continuously at 180–250°C, with some specialty formulations exceeding 300°C. Medium-temperature variants are optimized for 120–180°C ranges. These greases exhibit minimal oil separation (bleeding) even at peak temperatures. Key performance metrics include dropping point (the temperature at which grease transitions to liquid), evaporation loss (measured by ASTM D972), and oxidation resistance (via ASTM D942). Premium formulations often achieve dropping points above 250°C and evaporation losses below 5% at 200°C after 22 hours.
Main Applications
In steel mills, HT grease lubricates rolling mill bearings exposed to radiant heat from slabs. Glass plants use it in annealing lehr bearings, where temperatures exceed 200°C. Automotive applications include wheel bearings in heavy-duty vehicles and components near exhaust systems. The energy sector relies on these greases for wind turbine pitch bearings and geothermal equipment. Food-grade HT greases (NSF H1 certified) are essential in bakery ovens and food processing lines. Selection depends on both temperature range and environmental factors like moisture or chemical exposure.
Safety and Storage
While HT/MT greases are generally safe when used properly, thermal degradation can release volatile compounds. Always apply grease after equipment cools below 100°C when possible. Use heat-resistant gloves and face shields during manual application to hot surfaces. Store containers away from direct sunlight and heat sources to prevent premature oxidation. Bulk drums should be rotated within 12 months, while sealed pails have a typical shelf life of 24 months. Never mix different grease types, as incompatible thickeners can reduce performance.
B2B Procurement Guide
Industrial buyers should specify: 1) Maximum operating temperature (including peak spikes), 2) Required NLGI consistency grade (usually #2 for bearings), 3) Base oil type (mineral, PAO, or silicone), and 4) Certifications like DIN 51825 or ISO 6743-9. For large-volume purchases (1+ metric tons), consider custom formulations with extended relubrication intervals. Verify supplier testing protocols—reputable manufacturers provide third-party ASTM test reports. Container options range from 400g cartridges for precision application to 180kg drums for plant-wide systems.
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