Low viscosity, mixes easily
MEKP hardener is used for the fast cold curing of polyester resins preaccelerated with cobalt, e.g. UP laminating resin Palatal U 569, UP Cast Resin "transparent", UP Pre-gel (white and colourless), etc.
The standard quantity added is 1-3 % (with an accelerator fraction of 0,3-2 %). R&G MEKP hardener is a 50 % solution of methylethylketoneperoxide in a desensitised plasticizer