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High Temperature Bearing Grease with WS2
MK-WS2-HT is a high temperature EP grease engineered to reduce friction and extend equipment life in high-speed bearing and severe-duty applications. It is formulated with high-viscosity synthetic base oil (PAO), tungsten disulfide (WS2), and special performance additives to support extreme pressure operation and long service life.
Designed for demanding environments, this high temp grease operates across a wide temperature range and maintains stability under high shear—making it a reliable option when conventional greases struggle with heat, load, moisture, and wear.
Highlights of High Temperature Grease
- Low friction performance compared to other high temperature grease options.
- Extreme Pressure (EP) capability driven by WS2; WS2 load-bearing property is stated as 300,000 psi.
- Resistance to water, rust, and humid environments for more stable lubrication in challenging conditions.
- Excellent mechanical stability under high shear for high-speed rotation equipment.
- Strong abrasion resistance suited to high-load and impact-load applications; also used for bearing grease use cases.
- High dropping point helps prevent solidifying at higher temperatures.
Performance Overview (At-a-Glance)
| Parameter | Typical Value / Notes |
|---|---|
| Operating temperature range | -20°C (-4°F) to 800°C (1472°F) |
| Dropping point | >320°C (approx. 608°F) |
| Coefficient of friction | 0.015 |
| EP / load-bearing statement (WS2) | WS2 load-bearing property stated as 300,000 psi |
| Water washout (38°C, 1h) | <3.5% |
| Oil separation on steel net (100°C, 24h) | <0.3% |
| Evaporation loss (150°C, 22h) | <0.4% |
| Appearance / form | Black, semi-solid |
| Solubility in water | Insoluble |
| Specific gravity | 0.92 |
| Flash point | 245°C (approx. 473°F) |
Common Applications for High Temp Bearing Grease
MK-WS2-HT is built for equipment where heat + load + speed accelerate grease breakdown and bearing wear. Common high temperature grease applications include:
- High-speed bearings where friction and heat buildup can shorten lubrication life.
- High-load / impact-load points (pins, bushings, shock-load zones) where EP performance matters.
- Moisture-exposed equipment where water resistance and rust protection are required.
- Industrial heat environments such as ovens, kiln-area conveyors, and heated process lines where grease stability is critical (selection depends on equipment design and relube practices).
If you’re standardizing lubrication across multiple plants or sites, use the tables below to align the correct packaging format and confirm the required grease grade and relubrication schedule.
How to Choose the Right High Temp Bearing Grease
Grease selection directly impacts bearing temperature, drag, and failure risk—especially in high-speed rotation equipment.
Key selection checks:
- Viscosity vs. speed: As bearing speed increases, the lubrication film requirements change and viscosity often needs to be reduced; also, grease viscosity drops as bearing temperature increases.
- Speed factor consideration: Your current page notes that for a speed factor greater than 500,000, high temperature bearing grease is used.
- Channeling behavior: Channeling describes how grease moves to refill voids on surfaces. Proper channeling can reduce churning and temperature rise during rotation.
- Thickener structure: Thickener type influences channeling characteristics; short-fibered thickeners are described as offering smoother texture and better channeling.
For OEM-critical applications, confirm compatibility and relubrication intervals with equipment documentation and your maintenance standards.
Technical Specifications (Typical Data)
| Test | Typical Data | Test Method |
|---|---|---|
| Cone Penetration (NLGI class) | #0, #1, #2 | ASTM D217, GB/T269 |
| Infiltration Degree (0.1mm) | 310–340 / 259–265 / 220–250 | ASTM D217, GB/T269 |
| Dropping Point (°C) | >320°C | ASTM D2265, GB/T3498 |
| Oil separation on steel net (100°C, 24h) % | <0.3 | ASTM D1742-94, SH/T0324 |
| Corrosion (T2 Sheet Copper, 100°C, 24h) | No color change | ASTM D4048, GB/T7326(II) |
| Evaporation Loss (150°C, 22h) % | <0.4 | ASTM D972-02, SH/T0337 |
| Water Washout (38°C, 1h) % | <3.5 | ASTM D1264, SH/T0109 |
| Four-ball Test PB(N) | ≥800 × 9.8; ≥114 × 9.8 | ASTM D2596-97, GB/T3142 |
| Coefficient of Friction | 0.015 | (as listed) |
| Free Alkali NaOH % | <0.05 | SH/T0329 |
Downloads (Brochure + SDS)
Safety & Handling Summary (SDS-based, buyer-friendly)
- Product identification: MK-WS2-HT High Temperature EP Grease with WS2; chemical family listed as petroleum hydrocarbon.
- GHS classification / signal word: Skin irritation (Cat 2), eye damage (Cat 1), long-term aquatic hazard (Cat 1); signal word “Danger.”
- Key hazard statements: H315 (skin irritation), H318 (serious eye damage), H410 (very toxic to aquatic life with long lasting effects).
- Storage caution: Thermal decomposition may produce hydrogen sulfide and other sulfur-containing gases at temperatures greater than 113°F; store in cool, dry, well-ventilated areas away from ignition sources.
- Transport status: Listed as Not regulated for DOT/TDG, IMDG, ICAO/IATA.
FAQ
- What is high temperature grease used for?
High temperature grease is used to reduce friction and support longer service life in equipment—especially where bearings operate at high speed and face elevated heat. - What does EP mean in high temperature EP grease?
EP means Extreme Pressure—formulated to help protect components under high load and impact load conditions. - What is the operating temperature range for MK-WS2-HT?
The brochure lists a range of -20°C (-4°F) to 800°C (1472°F). - What is “dropping point” and why does it matter?
Dropping point indicates when grease structure begins to break down at higher temperature. MK-WS2-HT is listed with a dropping point >320°C, supporting stability in high-heat environments. - Is this suitable as a high temp bearing grease?
The page and brochure both position it for bearing grease applications and high-speed rotation equipment selection considerations. - Is the product regulated for transport?
The SDS lists it as Not regulated for DOT/TDG, IMDG, and ICAO/IATA.