SR 644

Polypropylene glycol (400) dimethacrylate. It is water soluble and provides high flexibility, good chemical resistance, low shrinkage and high abrasion resistance. SR644 exhibits good hardness and good water resistance. It does not support high temperatures, localized heat sources (ie, drum or band heaters), oxidizing conditions, freezing conditions, direct sunlight, ultraviolet radiation, and inert gas blanketing. It should not be used with strong oxidizers, strong reducers, free radical initiators, inert gases, and oxygen scavengers. Used in waterborne coatings.