CircuitWorks Thermal Paste

Thermal compound for heat transfer away from electronics and electrical components

CircuitWorks® Thermal Paste facilitates heat transfer away from electrical/electronic components. This heavy consistency material is thickened with a heat conductive filler to maintain a positive heat sink seal in electrical/electronic equipment.

Heat Sink Grease (CT40-5)

  • Silicone-base
  • Thermally stable from -40°F(-40°C) to 392°F (200°C)
  • Meets MIL-DTL-47113D Type I

Silicone Free Thermal Paste (CW7270)

  • Silicone free compound avoids silicone migration
  • Thermally stable from -99.4°F(-73°C) to 392°F (200°C).  
  • Exceeds MIL-C-47113 for thermal conductivity

Boron Nitride Thermal Paste (CW7250, CW7250KG)

  • Provides maximum thermal conductivity with superior dielectric properties
  • Silicone free compound will not harden or dry out
  • Thermally stable from -99ºF (-73ºC) to 392ºF (200ºC)
  • Exceeds MIL-C-47113 for Thermal Conductivity

Features & Benefits

  • Facilitates heat transfer between circuit components and heat sinks
  • Excellent thermal and dielectric properties
  • Will not dry out, harden, or melt
  • Noncorrosive and nonflammable

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Part # Size Units Per Case Price Per Case Add To Cart

Heat Sink Grease - 5 oz. / 142 g tube

12 blister cards $353.16

Silicone Free - 7 g (0.25 oz.) syringe

12 blister cards $166.20

Boron Nitride - 3.4 g (0.12 oz.) syringe

12 blister packs $235.80
Order from an authorized distributor


My thermal paste seems like it's getting dried out. Can I re-solvate it?

Try adding VMP naphtha (a common paint thinner) to the compound at approximately 1 part VMP to 100 parts compound. Mix thoroughly to get it back to the consistency required. This is mostly by “eyeball” so you may need a little less or a little more, depending on how dry the material is.

How do I figure out the shelf life of a product?

The shelf life of a product can be found on either the technical data sheet (TDS), available on the product page, or by looking on the certificate on conformance (COC). The COC can be downloaded by going to Once you have the shelf life, you will need to add it to the manufacture date for a use-by date. The manufacture date can be identified by the batch number. The batch code used on most of our products are manufacture dates in the Julian Date format. The format is YYDDD, where YY = year, DDD = day. For example, 19200 translates to the 200th day of 2019, or July 19, 2019. This webpage explains and provides charts to help interpret our batch numbers:


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