Phase-changing thermal mattresses are a very interesting alternative to thermal grease.
This material comes in the form of a pad at room temperature and can change its condition when subjected to temperatures above 50oC.

This solution is easy to use and highly efficient in operation (reduced thermal resistance).

Parameters	Units	TG-V833	TG-V838	Test
Thermal conductivity	[W/mK]	3.3	3.8	ASTM D5470
Thickness	[mm]	013/0.20/0.30		ASTM D374
Color	[-]	Gray		Visual
State change temperature	[C]	50		-
Density	[g/cmɜ]	3.4	2.5	Astm D792
Dielectric dress (Vac)	[kV]	1		Astm D149
Dielectric constant	[@1kHz]	13.3		Astm D412
Resistivity	[ohm.m]	3.0 x1011	3.0 x 1010	ASTM D257
Temperature of use	[C]	-40C - 125C		-
Datasheet	[-]			-

Tables given as an indication

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