Thermal Grizzly has rolled out new Pro versions of two of its thermal pastes, Hydronaut Pro and Duronaut Pro, promising better heat transfer, steadier long-term performance, and less of the messy squeeze-out that can plague heavily loaded CPU coolers. The pitch is simple: if every part of the thermal path matters, the paste itself had better stop acting like the weak link.
The company says both compounds are already available in 2-gram syringes with an applicator spatula. Hydronaut Pro is aimed at industrial customers, while Duronaut Pro is the more conventional all-round option. In a market where thermal paste performance gains are usually incremental, a 4% improvement over the non-Pro versions is not a headline-grabber so much as a reminder that thermal interfaces still have room for polish.
What Thermal Grizzly changed
Duronaut Pro uses a blend of special silicone oil, aluminium micro-powder, and nano zinc oxide powder. Thermal Grizzly says that combination lowers contact resistance and makes it possible to spread the paste in a very thin layer, while keeping it dielectric and resistant to hardening over time.
Hydronaut Pro takes a different route and leaves silicone out altogether. That matters because silicone-based pastes can migrate or get pushed out from under a heatsink or water block over time, especially with repeated temperature swings, which can also put nearby sealing materials at risk. Thermal Grizzly says Hydronaut Pro avoids that problem while keeping high thermal conductivity over long periods without curing.
Thermal Grizzly’s test setup
The company’s own lab testing found the new Pro formulas performing 4% better than the previous versions without the suffix. The test method used a 30 × 30 mm contact area, 240 W of heat dissipation, and 300 N of mechanical force pressing on the surface. That is a fairly serious stress test, which is exactly what you want if you are trying to prove the paste is more than marketing gloss.
- Duronaut Pro: silicone oil, aluminium micro-powder, and nano zinc oxide powder
- Hydronaut Pro: silicone-free formula for long-term industrial use
- Claimed gain: 4% over the non-Pro versions
Price and availability
Thermal Grizzly is selling both pastes now on its website. Hydronaut Pro costs €14.9, while Duronaut Pro is priced at €17.9. For buyers already willing to pay premium money for cooler, more stable thermals, that price gap is small enough to make the choice come down to formula rather than sticker shock.
The real question is whether the Pro branding will stay confined to niche buyers or turn into the company’s new default across more mainstream thermal products. Cooler makers and system builders have been squeezing performance out of every component for years; the paste business is just catching up.