High Performance

Castrol Molub-Alloy OG 936 SFH S

Open Gear Compounds (Solvent Free)

DESCRIPTION

Castrol Molub-Alloy™ OG 936 SF Heavy Spray (previously called Molub-Alloy™ 936 SF Heavy Spray) is an open gear
lubricant developed specifically for use on heavy duty equipment in mining and industrial service. Molub-Alloy OG 936 SF
Heavy is compounded to help give maximum protection to gears and slides on large draglines and shovels while
minimizing potential pollutants to the environment.

A proprietary blend of Molub-Alloy lubricating solids is included to promote anti-wear and load carrying properties.
These lubricating solids work synergistically with chemical anti-wear and extreme pressure (EP) additives to reduce
contact temperatures while providing excellent anti-weld protection under extremepressure and shock loading.

The structural integrity and strength of the lubricating film is particularly valuable in the critical process of seating new
gears because of the natural occurrence of high spots (asperities) in newly machined surfaces. The lubricating film
must separate the mating surfaces sufficiently to cushion the effect of the impact of asperities, and thus minimize initial
pitting which could lead to progressive and destructive pitting later.

A highly refined, viscous, paraffinic petroleum derivative is the foundation of a blended base fluid with excellent natural
chemical and thermal stability. Molub-Alloy OG 936 SF Heavy Spray is compounded to flow readily in the film-forming
process; yet it resists “squeeze-out” and clings tenaciously even to gear teeth in vertical orientation.

Rust and oxidation inhibitors are included in the formulation to protect the equipment and the lubricating film against the
elements in severe climate.

APPLICATIONS

Molub-Alloy OG 936 SF Heavy is suitable for use on all types of open gears, racks and pinions and sliding or skidding
applications like in Draglines and Shovels.

This product is used extensively in mining , construction, onshore drilling operations and on offshore installations
facilitating effective lubrication and protection on:

  • Rack and pinion jacking mechanisms.
  • Cantilever skidding systems.
  • Mooring winch open gearing and slides.
  • FPSO offloading systems.
  • Crane slew ring & pinion.
  • Exposed threads on penstock valves.
  • Heavy duty top dressing for the ultimate protection of wire ropes.
ADVANTAGES
  • Formulated to address environmental concerns – it is free of solvents, lead, antimony and barium
  • Forms tough durable film with “cushioning” effect, even under extreme pressures and at very slow speeds; film
  • Resists erosion from rain or sleet, and resists peeling in dusty environments
  • Resists film destruction by contaminating oils and greases migrating from nearby mechanisms
TYPICAL CHARACTERISTICS
Name Method Units Molub-Alloy GM

969/320

Specific Gravity @ 25°C / 77°F

 

 

ASTM D1298 / ISO

3675

 

1.002
Density of finished grease @ 15°C / 59°F In-house test lb/gallon 8.35
Consistency

 

ASTM D217 / ISO 2137

 

NLGI

Grade

0
Worked Penetration (60 strokes @ 25°C / 77°F)

 

ASTM D217/ ISO

2137 0.1

mm 345-360
Brookfield Viscosity

 

ASTM D2983 / ISO

9262

cP 144,000
Base Oil Viscosity @ 40°C / 104°F

 

ASTM D445 / ISO

3104

mm²/s 2030
Base Oil Viscosity @ 100°C / 212°F

 

ASTM D445 / ISO

3104

mm²/s 57
Flash Point – open cup method

 

ASTM D92 / ISO

2592

°C/°F 158/316
Four Ball Weld Load test – Load Wear Index (27°C

/ 1770 rpm)

 

ASTM D2596 / ISO

11008

130
Four Ball Weld Load test – Weld Point

 

ASTM D2596 / ISO

11008

kgf 800
Four Ball Wear test – Wear Scar Diameter (40 kgf

/ 75°C / 1200 rpm / 1 hr)

 

ASTM D2266 / ISO

51350

mm 0.7
Rust Test (distilled water) ASTM D1743 Pass Pass
Copper Corrosion (24 hrs,100°C / 212°F) ASTM D4048 Rating 1b
Lubricating solids, particle size microns nominal 15,maximum 45
APPROVAL & PERFORMANCE CLAIMS
ADDITIONAL INFORMATION

Molub-Alloy OG 936 SF Heavy Spray was not intended for general use in bushings and bearings except in slow moving
heavily loaded applications. Contact Castrol Engineering for all new applications in bearings.

This product was previously called Molub-Alloy 936 SF Heavy Spray. The name was changed in 2015.

PACK SIZES AVAILABLE
12x400ml

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