ID-COOLING

ID-Cooling Frost X25

Expert rating7.5 / 10

Model:: Frost X25
Compound Type:: Silicone-Based
Thermal Conductivity:: 10.5 W/mK
Electrical Conductivity:: Non-Conductive
Package Size:: 2g or 4g syringe
Recommended Use:: Mainstream CPU/GPU
Operating Temperature:: -40C to 180C

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Manufacturer: ID-COOLING Last updated: 2026-10-06

ID-Cooling Frost X25 Review

ID-Cooling Frost X25 is the mid-tier paste in ID-Cooling's Frost line, rated 10.5 W/mK and sold in 2g or 4g syringes.

Frost X25 is a well-documented mid-tier paste and the one we'd pick for a typical gaming build. ID-Cooling publishes 10.5 W/mK, thermal impedance under 0.05, 2.6 g/cm3 density, 560 Pa s viscosity and a -40C to 180C range. That puts it ahead of the entry ID-TG15 (above 8.5 W/mK) and behind Frost X45 (15.2 W/mK). If your CPU runs hot under a big tower or AIO, the jump to X45 is worth it. If not, X25 is plenty.

Thermal Performance and Conductivity

ID-Cooling rates Frost X25 at 10.5 W/mK with a thermal impedance under 0.05. Neither figure comes with a test method, so we compare it mainly within ID-Cooling's own range: above ID-TG15 at more than 8.5 W/mK and below Frost X45 at 15.2 W/mK.

For a mainstream gaming CPU, that is enough headroom.

Compound Type and Composition

Frost X25 is a grey silicone-based grease. ID-Cooling lists a density of 2.6 g/cm3, so the 2g syringe holds about 0.77ml and the 4g about 1.5ml. ID-Cooling also lists a dielectric constant of 5.

Application and Consistency

ID-Cooling publishes a viscosity of 560 Pa s, which is a workable consistency: thick enough not to run, soft enough to spread with a card or let the cooler press out from a dot. A 2g syringe covers a couple of desktop CPU applications; the 4g suits a CPU plus a GPU repaste.

Electrical Safety

Our listing records Frost X25 as non-conductive. ID-Cooling publishes a dielectric constant of 5 but no volume resistivity, so we'd still clean any squeeze-out off exposed GPU components.

Longevity and Pump-Out Resistance

ID-Cooling rates it from -40C to 180C. It publishes no lifespan, reapplication interval or pump-out test. On a desktop CPU with a heatspreader, pump-out is rarely an issue; on a bare GPU die, plan to check temperatures after a year.

Comparison to Alternatives

Against ID-Cooling ID-TG15, X25 is the upgrade worth making. Against Frost X45 (15.2 W/mK), X45 is the better buy for overclocked or high-wattage CPUs. Against Thermalright TF7 (12.8 W/mK) and Arctic MX-6, X25 sits in the same practical tier.

Winner for: mainstream gaming builds that want documented specs without paying flagship prices.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating7.5 / 10

A capable mainstream paste from ID-Cooling's well-regarded Frost line, offering most of X45's benefit at a lower price.

Best for

Mainstream gaming CPUs under air or AIO coolers
ID-TG15 users wanting a documented step up
Buyers who want viscosity and density data on the spec sheet

Not for

Overclocked or high-wattage CPUs, where Frost X45 fits better
Extreme overclocking or direct-die cooling

Specifications

What these specs mean

Identity and form

Brand	ID-Cooling
Model	Frost X25

Thermal performance

Conductivity Source	https://www.idcooling.com/product/detail?id=286

Electrical and board risk

Dielectric Constant	5 at 1 MHz
Paste Segment	Standard Paste

Application

Viscosity	560 Pa-s

Operating envelope

Min Operating Temperature	-40 C
Max Operating Temperature	180 C

Quantity, volume versus weight

Density	2.6 g/cm3

Compound Type	Silicone-Based
Thermal Conductivity	10.5 W/mK
Electrical Conductivity	Insulating
Package Size	2g or 4g syringe
Recommended Use	Mainstream CPU/GPU

FAQs

Is Frost X25 or Frost X45 better?

Frost X45 is rated higher at 15.2 W/mK versus 10.5 W/mK for X25. For overclocked or high-wattage CPUs, X45 is the better pick. For a typical gaming build, X25 is enough.

How many applications are in a 2g syringe of Frost X25?

ID-Cooling doesn't state a number. At 2.6 g/cm3, 2g is about 0.77ml, which typically covers a couple of desktop CPU applications.

Is ID-Cooling Frost X25 electrically conductive?

Our listing records it as non-conductive. ID-Cooling publishes a dielectric constant of 5 but no resistivity figure.