SYLTHERM XLT – TMC Industries, Inc.

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SYLTHERM™ XLT Specifically formulated, high-performance silicone polymer designed for use as a low temperature, liquid phase heat transfer medium. It offers remarkable low-temperature heat transfer and pumpability, plus thermal stability.


Temperature: -100 to 500 °F (-73.3°C)
Vapor Pressure: 75.46
Specific Heat: 0.078 °F (-17.7°C)
Viscosity: 90.17
Density: 59.3
Freezing Point: -158 °F (-105.5°C)
Flash Point: 116 °F (46.6°C)
Autoignition: 662 °F (350°C)

Primary Chemistry: Polydimethylsiloxane


Nontoxic regarding acute oral ingestion
Physical properties allow it to be used in place of chlorinated solvents as a secondary coolant


Used in pharmaceutical applications, Single fluid heating, and cooling, Environmental test chambers, Chillers, Heat Transfer Skids, Immersion Cooling, Immersion Freezing, Jacketed Reactors, Lyophilizer, Mechanical Contractors, Power Cogeneration, Vaporizers, Waste Heat Recovery, Chillers, Cryogenics, Food Machinery, Mechanical Contractors, Related End Markets, Maintenance, Repair, Overhaul, Aerospace and Aviation, Chemical Petrochemical, Consumer Products, Energy Generation & Utility, Facility Infrastructure


  • Oil & gas
  • Pharmaceutical
  • Chemical processing              


  • Highly stable
  • Long-lasting fluid
  • Low potential for fouling
  • Remains in service for ten years or more at 400°C (750°F).

SYLTHERM™ silicone thermal fluids are specially formulated, high-performance polymers designed for use as a low temperature, liquid phase heat transfer medium. They are known for their low viscosity, which offers excellent heat transfer performance and long service life

Shipping Policy

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

Shipping Time -- Most orders received before 3:00PM Central Time will ship the same day, provided the product ordered is in stock. Most orders received after 3:00 PM will ship the next business day. Orders are not processed or shipped on Saturday, Sunday or major US holidays.

We cannot guarantee when an order will arrive. Consider any shipping or transit time offered to you by the carrier as an estimate. We encourage you to order in a timely fashion to avoid delays caused by shipping or product availability.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

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