K5 PRO viscous thermal paste for thermal pad replacement 60g 3X20g pack (Apple iMac, Sony PS4 & PS3, XBOX, Acer Aspire etc) K5-PRO is a high quality gummy / sticky thermal paste designed for use on memory chips and GPUs of various computers including Acer Aspire 6930 , Apple iMac A1311 video boards. This is the only comercially avaliable product at the moment that can replace the gummy thermal paste that is originally used by Apple. K5-PRO can replace soft thermal pads that are used on computers (up to 3mm thick) K5-PRO has thermal conductivity K&gt;5,3 W/m.K (at least 3 times higher than common thermal pads that are used on computers and comercial electronics) Computer Systems materials science laboratory testing : Method using a comparative technique (P. Karydopoulos, P. Frantzis, N. Karagiannis MSAIJ 2014) K5-PRO is applied very easily directly on the component and has no electrical conductivity. It can be heated up to 250 degrees (Celcium) and has a long operational life time (practically infinite) Expiration date: No expiration date (new formula). Infinite storage / service life. Protect from frost and dust