HT Moly grease is a high-temperature, extreme-pressure lubricant built on a mineral or synthetic grease base and fortified with molybdenum disulfide (MoS2) solid-lubricant particles. It is formulated to protect metal surfaces under heavy load, high friction, and slow relative motion — conditions where a standard lubricating grease can be squeezed out of the contact zone or simply worn through. In industrial maintenance it is most commonly used on heavily loaded bearings, gears, splines, press-fit assemblies, and high-torque fasteners.
What Makes Moly (MoS2) Different From a Standard Grease Additive?
Molybdenum disulfide is a solid lubricant, not a liquid additive. Its molecular structure forms flat, plate-like layers that slide easily over one another, similar to graphite. When suspended in a grease base, these MoS2 platelets deposit onto metal surfaces and form a thin, low-friction film that continues to protect the surfaces even in boundary-lubrication conditions — moments of startup, shock loading, or very slow movement where a conventional oil film can momentarily break down. This is why moly greases are specified for heavy, slow-speed, high-load contacts rather than high-speed, light-load applications, where a standard grease already performs well.
HT Moly Grease vs. Copper Grease vs. Aluminium Anti-Seize: Key Differences
All three products are used to protect metal-to-metal contacts from seizing, galling, or excessive wear, but they are optimised for different combinations of load, temperature, and metal compatibility.
| Attribute | HT Moly Grease | Copper Grease | Aluminium Anti-Seize |
| Primary lubricating solid | Molybdenum disulfide (MoS2) | Fine copper particles | Fine aluminium particles |
| Best suited for | Heavy, slow-speed, high-load contacts (bearings, gears, splines, press-fits) | High-temperature steel-to-steel fasteners (exhaust, brakes, manifolds) | Fasteners involving aluminium components; food/marine/general assembly |
| Galvanic corrosion risk | Low — MoS2 is not a reactive metal | Higher risk on aluminium and stainless due to copper's electrochemical potential | Low — matched to aluminium substrates |
| Practical temperature ceiling* | Typically set by the base grease/oil rather than the MoS2 itself | Very high intermittent tolerance (often quoted to several hundred °C) | Moderate-to-high, formulation dependent |
| Key limitation | Not intended as a general-purpose anti-seize for frequent disassembly at very high heat | Can promote galvanic attack on dissimilar/aluminium metals | Lower extreme-pressure load capacity than moly-based greases |
*Exact temperature ranges, NLGI grade, and load ratings vary by formulation. Please confirm HT Moly, copper, and aluminium anti-seize specifications against DRP Silicone's own technical data sheets before publishing, so all figures in the live post are verified rather than industry-general assumptions.
When to Choose HT Moly Grease
- Heavy point- or line-contact loads where the lubricant film risks being squeezed out
- Slow-speed, high-load bearings and gear meshes
- Splined shafts, press-fit assemblies, and couplings prone to fretting corrosion
- Bolted joints subject to vibration or repeated thermal cycling
- Applications where startup friction (breakaway torque) needs to be minimised
Industries & Applications
- Heavy machinery and construction/earth-moving equipment
- Steel and metal processing plant maintenance
- Automotive and off-highway assembly (wheel bearings, U-joints, suspension components)
- Mining and material-handling equipment
- General industrial maintenance wherever high-load, low-speed lubrication is required
Frequently Asked Questions
Is moly grease better than copper grease?
It depends on the job. HT Moly grease is generally the better choice for reducing friction and wear under heavy, slow-speed loads (bearings, gears, splines). Copper grease is often preferred where the priority is anti-seize protection on steel fasteners exposed to very high, sustained heat, such as exhaust systems and brake hardware.
Can HT Moly grease be used on aluminium fasteners?
Molybdenum disulfide itself does not carry the galvanic corrosion risk that copper does, but the base grease and any other filler content should still be checked. Where dissimilar metals and long-term outdoor exposure are involved, a dedicated aluminium anti-seize compound is usually the safer, purpose-built choice.
What temperature can HT Moly grease withstand?
This varies by formulation. Molybdenum disulfide as a solid lubricant is stable at very high temperatures, but the practical operating ceiling of the finished grease is usually set by the base oil and thickener system, not by the MoS2 itself. Always check the specific product's technical data sheet for the verified operating range.
Talk to DRP Silicone
For help selecting the right moly grease, copper grease, or anti-seize compound for a specific load, temperature, and metal combination, contact DRP Silicone's technical team for guidance and a product recommendation.