Primetals Mill Duty Grease

Premium steel mill grease



Product Description

Primetals Mill Duty Grease is an extended service lithium complex grease specifically designed for use in long rolling equipment manufactured by Primetals Technologies. It is designed to outperform conventional steel mill greases by a combination of high performance additives, robust ISO VG 220 base oil and proprietary manufacturing technology.  In service it provides strong adhesion, structural stability and resistance to water contamination for excellent protection against rust and corrosion.  In addition, Primetals Mill Duty Grease offers excellent high temperature wear protection, with its high technology performance additives allowing for operating temperatures of 140º C (284°F).


Primetals Mill Duty Grease is designed to perform in challenging steel mill operating conditions that include high temperature, water contamination, shock loading and extended re-lubrication intervals.


Features and Benefits

Primetals Mill Duty Grease utilizes the same technology found in Mobilgrease XHP 221, a product whose demonstrated performance has made it a popular choice of Primetals Technologies equipment owners worldwide.  It is formulated to provide excellent oxidation stability as well as anti-wear and EP protection. 

Features Advantages and potential benefits

Strong resistance to water washout and


Lubrication and protection in the most severe

water exposure conditions

Highly adhesive and cohesive thickener structure

Helps reduce leakage and extend re-lubrication

intervals for reduced maintenance

Excellent rust and corrosion resistance Prevents damage to metal surfaces in hot, humid and wet environments
Resists thermal, oxidative and structural degradation at high temperatures Enhances grease life and bearing protection in hot applications to reduce maintenance and repair costs

Excellent anti-wear and EP


Protects equipment exposed to sliding wear to extend operating life and help reduce unscheduled downtime

Broad multi-purpose application


Provides potential for inventory rationalization and reduced inventory costs




Primetals Mill Duty Grease can be used in a wide variety of long rolling mill applications. Its NLGI Grade 1 penetration makes it ideal for use in automatic grease systems where it can reduce grease line plugging and related maintenance. Primetals Mill Duty Grease is supported with the joint expertise and field technical services offered by Mobil and Primetal Technologies. 



Typical Properties 

Primetals Mill Duty Grease
NLGI Grade 1
Thickener Type Lithium complex
Color, Visual Dark blue

Penetration, Worked, 25º C, ASTM

D 217

Dropping Point, ºC, ASTM D 2265 280
Viscosity of Oil, ASTM D 445, cSt @ 40º C 220
4-Ball Wear Test, ASTM D 2266, scar, mm 0.5
4-Ball Weld Load, ASTM D 2596, kg 315
Timken OK Load, ASTM D 2509, lb. 40
Bomb Oxidation, ASTM D 942, Pressure drop at 100 hrs, kPa (psig) 35 (5)
Corrosion Prevention, ASTM D 1743 Pass
Rust Protection, IP 220-modified, Distilled Water Washout 0, 0
Copper Strip Corrosion, ASTM D 4048 1B
Penetration Consistency Change, Roll Stability, ASTM D 1831, mm/10 -15



Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Safety Data Sheet (SDS) are followed. SDS's are available upon request through your sales contract office, or via the Internet on This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.