Providing Precision Lubricants and Lubrication Solutions


Open Gear and Bearing Grease: RPL-421

Product Description:

RPL-421 is a heavy-duty, extreme pressure open gear grease manufactured from heavy oils, synthetic fluids and an amorphous silica gel thickener. The resulting product is extremely tacky and exhibits excellent adhesion properties and tenacious lubricating film that offers complete protection for open and semi-enclosed gears.

The RPL-421 is 100% lubricant. It is free of all fillers such as textile fibers and/or asphalt materials that are sometimes present in lesser gear greases. The RPL-421 will cling to all types of surfaces, it will not drip, run out, or fling-off even at slow to moderate speeds. It is self-healing and self-carrying so it can be quickly applied to one gear tooth and it will carry itself through the entire gear train. It contains MoS for extreme pressure and heavy load protection.

RPL-421 is especially suited for heavy, slow-moving equipment in outdoor conditions when other products do not seem to hold up to the heavy dirt, contamination and extreme demands of an open gear lubricant. Lab tests show over 175,000-psi protection and more than 1000 kg in the 4-Ball Load Test (ASTM D-2596). RPL-421 is totally water and weatherproof. It will neither melt in the summer heat nor will it become brittle in winter cold.
Typical uses include a wide range of extreme bearing, open and semi-enclosed gear applications including construction, forestry, marine, cement processing, drilling, boring, mining and railcar applications.

Features and Benefits:

Extremely tacky with excellent adhesion

Contains MoS for extreme pressure protection

Excellent water resistance

Contains no fillers

Self-carrying, self-healing, does not melt or chip-off

Excellent EP, rust and corrosion protection

Well suited for outdoor, heavy-duty and slow moving equipment


Typical Operating Properties:

NLGI Grade 2 --
Colour Black --
Thickener Amorphous Silica --
Texture Tacky --
Penetration, Worked
60 Strokes (0.1mm) 
305 ASTM D217
Dropping Point None ASTM D2265
Base Oil Viscosity
675 cSt ASTM D445
45 cSt ASTM D445
Viscosity Index 98 ASTM D2270
Pour Point -18C / 0F ASTM D97
Flash Point 245C / 473F ASTM D92
4-Ball Weld Load 500 kg ASTM D2596
4-Ball Wear 0.60 mm ASTM D2266
Copper Corrosion
Pass ASTM D130
Timken Load 45 lbs ASTM D854
Specific Gravity 0.980 ASTM D854

* Please note: The information, data and tables contained in this website have been carefully edited at the time of publication. However, no responsibility for possible errors or omissions can be assumed. We recommend contacting our Application Support Staff to discuss your specific requirements. We are constantly updating our products therefore technical data and specifications may change at any time without notice. 03/2010

Method of Application:

No special handling precautions are required. Follow regular maintenance instructions as provided with original equipment.

Available Container Sizes:

Size Metric US Imperial
Cartridge 0.41 L / 400 g 14 US fluid ounces / 0.88 lbs
Pail 18.93 L / 16 kg 5 gal / 35 lbs
Keg 56.78 L / 54 kg 15 gal / 120 lbs
Drum 208.20 L / 181 kg 55 gal / 400 lbs
* NB: Sizes and weights are approximate.



Did you know?

We are pleased to offer a range of Food Grade open gear greases wherever incidental contact is possible.

For more information, please see the Food Grade Greases.


Material Safety
Data Sheets





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Davley Darmex Precision Lubricants, 2010