| Property | SI Units | English Units |
| Color | - | Crystal-clear liquid |
| Viscosity at 25 °C (77 °F) | 1.4 mPa·s | 1.4 cP |
| Flash Point (Closed cup) | 47 °C | 116 °F |
| Flash Point (Open cup) | 54 °C | 130 °F |
| Autoignition Temp. (ASTM D-2155) | 350 °C | 662 °F |
| Acid Number, Typical | 0.01 | — |
| Freeze Point | -111 °C | -168 °F |
| Density at 25 °C (77 °F) | 852 kg/m³ | 7.11 lb/gal |
| Specific Gravity at 25 °C (77 °F) | 0.852 | — |
| Heat of Combustion | 32,800 kJ/kg | 14,100 Btu/lb |
| Average Molecular Weight | — | 4,100 |
| Estimated Critical Temperature | 327 °C | 620 °F |
| Estimated Critical Pressure | 12.16 bar | 177 psia |
| Estimated Critical Volume | 3.9 l/kg | 0.063 ft³/lb |
SYLTHERMTM XLT heat transfer fluid is a specially formulated, high-performance silicone polymer designed for use as a low temperature, liquid-phase heat transfer medium. It offers outstanding low temperature heat transfer and pumpability, plus excellent thermal stability. SYLTHERM XLT fluid has essentially no odor, is low in acute oral toxicity, and is not listed as reportable under SARA Title III, section 313.††
| Property | Value |
| Physical State | Liquid |
| Color | Colourless |
| Odor | None |
| pH | Not applicable (non-polar/aprotic) |
| Boiling Point (760 mmHg) | > 190 °C |
| Flash Point | Tag closed cup 45.5 °C |
| Lower Explosion Limit | 0.9 % vol |
| Upper Explosion Limit | 13.75 % vol |
| Vapor Pressure | 4 hPa |
| Relative Density (water = 1) | 0.85 |
| Auto-ignition Temperature | 350 °C |
| Kinematic Viscosity | 1.6 mm²/s |
| Explosive Properties | Not explosive |
| Oxidizing Properties | The substance or mixture is not classified as oxidizing |
SYLTHERMTM XLT heat transfer fluid is a specially formulated, high-performance silicone polymer designed for use as a low temperature, liquid-phase heat transfer medium. It offers outstanding low temperature heat transfer and pumpability, plus excellent thermal stability. SYLTHERM XLT fluid has essentially no odor, is low in acute oral toxicity, and is not listed as reportable under SARA Title III, section 313.††
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