MRF Vapocure V339 Durothane PU Finish

MRF Vapocure V339 PU Finish 4 Ltr The higher the concentration of the hardener and the lower the concentration of the base, the faster the coating will cure. A good rule of thumb is to use a 1:1 ratio for small areas and a 3:1 ratio for large areas. The reaction begins when the hardener comes in contact with air. The chemical reaction that takes place between these two ingredients is called an addition polymerization reaction. This means that each molecule of hardener adds onto another molecule of base until all available sites on both have been used up. Once this happens, there is no more free monomers left to react with each other and they become bonded together permanently as one unit PU Finish The polyurethane system is made up of two different components: a resin (Part A) and a hardener (Part B). The resin is a liquid that contains long-chain molecules called polyols which are made up of repeating units called ether groups or polyether groups (RO). The hardener is also a liquid but has shorter chain molecules called polyisocyanates that contain repeating units called urethane groups (NCO). When these two different chemicals are mixed together in certain ratios, they chemically react with each other forming long chains of molecules which form polyurethane