QC Lubricants
7360 Milnor St. Philadelphia, PA 19136
(215) 333-4187 Direct Line

Toll Free
With Extension (800) 887-2436
For Technical Assistance:
Dial Extension 203 for Stan Jakubowski
For Sales:
Dial Extension 211 for Lu Ann Quinn or 224 for Lindsay Romero
Email Lu Ann Quinn  ♦   Email Lindsay Romero


We actively supply a comprehensive line of MIL-SPEC  and commercial lubricants.


Product Shelf Life Data
PDS and other Docs Boeing Specs
McDonnell Douglas Specs
QC BLU DEF Diesel Exhaust 


LHB Industries




Heat Transfer Oil S2 X

Formerly known as Shell Thermia C

Heat transfer oil that resists oxidative degradation

Product Description:

Heat Transfer Oil S2 X is a specially selected thermally stable mineral oil containing an anti-oxidant designed for heat transfer applications.

The thermal stability of heat transfer oil is a prime consideration. Nearly as important is the oxidation stability of the oil. While most hot oil units are designed to limit (or eliminate) contact of the circulating hot oil with air, some con-tact is inevitable at startup in the expansion tank during storage and from air leaks. The ability of Heat Transfer Oil S2 X to resist oxidative degradation has been demonstrated in tests simulating service conditions and confirmed by excellent performance in commercial applications.


closed heat transfer systems found in asphalt plants, chemical plants and other processing installations where jacketed kettles are to be heated

indirectly fired heat transfer systems where the primary heat source is located away from the equipment to be heated

closely controlled temperature and flameless heating (such as liquid or vapor gaseous heat transfer) used with heat-sensitive or flammable materials

temperatures as high as 600F in low-pressure systems

Resistance to rust and oxidation

Excellent demulsibility

Long term thermal stability

Excellent filterability

Elimination of water-treatment chemicals and other disadvantages of water and steam systems

Heat Transfer Oil S2 X Design Data
At F 100 200 300 350 400 450 500 550
Density 1 0.87 0.83 0.79


0.76 - 0.72 -
Thermal Conductivity 2 0.08 - 0.07 - - - 0.07 -
Specific Heat 3 0.46 - 0.56 - - - 0.65 -
Vapor Pressure 4 - - 0.1 0.5 1.7 5 15 35

 1. gram/ml 2. BTU-ft/ft2-hr-F 3. BTU/lb-F, or cal/gm-C 4. mm Hg.
Lowest starting temperature, F Recommended operating temperature, F
Centrifugal pump --- +20 Continuous operation --- 550
Gear pump --- +15 Maximum --- 600

Typical Properties of Heat Transfer Oil S2 X
  Test Method  
Product Code   66622
Gravity,API D 1298 29.2
Density, lbs/gal, 60F D 1298 7.33
Color D 1500 1.5
Viscosity:@ 0C, cSt D 445 800
Viscosity:@ 40C, cSt D 445 56
Viscosity:@ 100C, cSt D 445 7.2
Flash Point, COC, F D 92 450
Pour Point, F D 97 +5
Copper Corrosion D 130 1b
Acid Number, mg KOH/g D 974 0.01

Handling & Safety Information:

For information on the safe handling and use of this product, refer to its Material Safety Data Sheet