Mine dried up completely within 1 year installed. Had to use a razor blade and sanding paper to remove the application. There is no aluminum in the heatsink so it wasn't corrosion that caused it. The remaining in the tube is still a liquid of course.
pro and ultra are the same almost, since i had some i spilled on my desk and its been there over a year and its still perfectly liquid.
this is the details off that ultra, goes the same for pro i think i saw, not detailed however but both leads electric current and melts at 8 Centigrades,
just heat it up and u can separate it 8 degrees celsius, same goes for me with my ln2 block
also its impossible to dry up, its 100% alloy,
also it doesn't corrode anything, it makes aluminium soft as butter as gallium loves to do that,
taking it off aluminium as panic does not help as it goes into the metal, but it needs around 30 minutes depending the size of the block,
example if u put it on a car engine it would go into the aluminium and make it insanely alot weaker, it might even given in on itself
if you have a aluminium engine ofc like alot of race cars does and newer car models,
it doesnt need much but theres a math label i got somewhere
it contains
Chemical characterization:
Alloy of the metal components gallium, indium, rhodium, silver, zinc and stannous, bismuth;
suspended in a graphite-copper matrix
.
Contents materials: GALLIUM CAS-Nr.: 7440-55-3 EG-Nr.: 231-163-8
pH-value (20 °C) not applicable
Melting point (°C) 8°C
Boiling point (°C) > 1350 °C
Inflammability (°C) not applicable
flash point (°C) not applicable
Vapour pressure (°C) <10-8Torr bei 500 °C
Density (g/cm3) 6,85g/cm3
bulk density (kg/m3) not applicable
Solubility in water ( 20°C in g/l) insoluble
Solubility in organic solvents insoluble
dynamic viscosity
(mPa s/20° C)
0,0018
lower explosion limit not applicable
upper explosion limit not applicable
Electrically conductivity 7,28*106 S/m
source:
http://www.coollaboratory.com/pdf/safetydatasheet_liquid_ultra_englisch.pdf
on detail
9.2
as a note i noticed it has alot of graphite in it, thats why its better than the diamond paste