Methanol-ethanol-water in 16:3:1 proportion has been shown to be quasi-hydrostatic till 15 GPa. Otherwise you will have to resort to liquid gases as He, Ne, Ar, N2, being He the best of them and providing quasi-hydrostatic behaviour above 30 GPa.

Thanks for answer. Can you recommend some articles about this? Especially I'm interesting described in the articles technique to load liquid gases in to DAC.

Hello Alexander, this article describes a the latest system developed, as far as I know: http://www.tandfonline.com/doi/abs/10.1080/08957950802333593. Ar can be cryogenically loaded in a much simpler system, but is not a really good medium.

Thanks. This is a very complicated system.I wish find to system which require a small funding. I hope they exist.

To Francisco Javier Manjon. In article http://stacks.iop.org/JPhysD/42/075413 author show that 13:3:1 methanol-ethanol-water has a hydrostatic limit 10.5+-0.5GPa. So the best media is liquid He, but i unfortunately i can't find article which describe such technique to load DAC with them.

Technique to load liquid nitrogen into DAC: http://dx.doi.org/10.1063/1.1568551

It's been shown that the non-hydrostatic stress would cause a Bingham plastic flow once the external pressure is larger than a threshold.

Please refer to this:

Article Shear-induced anisotropic plastic flow from body-centred-cub...

Alternatively you can heat your DAC as you increase the pressure. This will melt the glassy phase of the meth-eth mixture at high pressures, and will improve hydrostaticity considerably. Once you have changed pressure, you can return to room temperature.