Product Description
MK-WS2-HT is a black semi-solid grease built for high-temperature, extreme-pressure service. It combines a high-viscosity synthetic base oil with tungsten disulfide (WS2) particles and special additives, and is aimed at bearing, high-load and impact-load lubrication where low friction, water resistance, mechanical stability and EP performance are needed. This page covers the 18 kg / 40 lbs / 5 gallon pail – a workshop and production-line format.
Technical Specifications
| Product code | MK-WS2-HT |
|---|---|
| Product type | High-temperature / extreme-pressure lubricating grease with WS2 |
| Physical form / appearance | Black semi-solid |
| NLGI classes | #0, #1 and #2 |
| Dropping point | >320°C |
| Coefficient of friction | 0.015 |
| Oil separation on steel net | <0.3% at 100°C for 24 h |
| Evaporation loss | <0.4% at 150°C for 22 h |
| Water washout | <3.5% at 38°C for 1 h |
| Specific gravity | 0.92 |
| Pack option | 18 kg / 40 lbs / 5 gallon pail |
This page covers the 18 kg pail format. Per the product brochure, the same grease also comes in 14 oz (400 g) cartridges, 1 kg jars and 170 kg drums – get in touch about other formats.
Key WS2 Grease Properties and Applications
Key Material Characteristics
- Extreme-pressure performance driven by tungsten disulfide (WS2) particles
- Coefficient of friction of 0.015, as listed in the brochure
- Resists water, rust and humid operating conditions
- Holds up mechanically under high shear
- Abrasion resistance suited to high-load and shock-load lubrication
Common Application Areas
- Bearing grease service
- High-load lubrication points
- Impact-load and shock-load lubrication
- Extreme-pressure applications
- High-temperature grease service
- Environments demanding water, rust and humidity resistance
Verify suitability for the intended equipment and operating environment before use, and go through the Product Brochure and SDS first – above all where grease equipment operates at high temperature, load or pressure.
Performance Reference Characteristics
| Brochure-stated temperature range | −20°C to 800°C (−4°F to 1,472°F) |
|---|---|
| WS2 load-bearing property | Approximately 300,000 psi |
| Flash point | 245°C (COC), per SDS |
| Corrosion test | No colour change on copper sheet at 100°C for 24 h |
Values are taken from the MK-WS2-HT product brochure and SDS and serve as reference data only, not a performance guarantee for any given application. For storage, handling and hazard precautions, always defer to the SDS rather than the brochure temperature range.
Safety, Handling and Storage
Store only in approved, closed containers in a cool, dry, well-ventilated area, away from heat, sparks and flame. Per the SDS, storage above 45°C (113°F) may lead to thermal decomposition and sulfur-containing gases. Use high-pressure grease equipment, wear protective gloves and suitable eye/face protection, and take care to avoid environmental release – particularly relevant when transferring grease from pails.
The SDS for MK-WS2-HT carries the signal word “Danger”, with classifications for skin irritation, serious eye damage and long-term aquatic hazard. Transport status under DOT/TDG, IMDG and ICAO/IATA is not regulated. Go through the SDS before handling or use.
Download Product Brochure (PDF) Download Safety Data Sheet (PDF)
Refer to the brochure and SDS for complete product, handling and hazard information before use.
Frequently Asked Questions
What makes MK-WS2-HT an extreme-pressure grease?
Its formulation pairs a high-viscosity synthetic base oil with tungsten disulfide (WS2) particles and special additives – the WS2 content is what delivers the extreme-pressure properties.
What NLGI grades are listed for MK-WS2-HT?
Per the product brochure: NLGI classes #0, #1 and #2.
What temperature and dropping-point values are listed?
The brochure gives a temperature range of −20°C to 800°C (−4°F to 1,472°F) with a dropping point above 320°C. Storage is a separate matter – the SDS warns of possible thermal decomposition above 45°C (113°F), so storage guidance should come from the SDS, not the performance range.
What applications is MK-WS2-HT intended for?
Bearing, high-load, impact-load, extreme-pressure and high-temperature lubrication, especially where water, rust and humidity resistance is required.
How should MK-WS2-HT be stored and handled?
Store in tightly closed containers in a cool, dry, well-ventilated area away from heat and ignition sources. Use protective gloves and eye/face protection, prevent environmental release, and follow the SDS for full handling precautions.
Technical information notice: Product information is for preliminary evaluation only and does not guarantee performance or suitability. Review the current SDS, TDS, and product specifications, try a small sample first, and confirm suitability before bulk use. Read the full disclaimer
