Good afternoon. Cobalt salts such as colorless cobalt, cobalt isooctoate and cobalt naphthenate are one of the catalysts for rapid polymerization of polyether and polyester monomers, and can also be replaced by organotin or organozinc salt (colorless cobalt can be added or not). MEKP is their polymerization ring-opening initiator, which is also commonly known as "Aksu" as curing agent. It is a phthalate solution with a MEKP content of 15%-30%. Description should be 19 1, 196 or 202. I don't know what the specific use is, just guessing. Please refer to as appropriate.