M520K is an orthopthalic based, medium reactivity, medium viscosity Unsaturated Polyester Resin. M520K is specially formulated to be used in filled casting applications. It exhibits good color and high filler loading capacity. Due to its high filler capacity, it helps reduce costs. Onyx, cultured marble, kitchen, offices, banks and hotels counters and bathtubs are amongst the end products of M520K. Used to manufacture souvenirs where color properties are required. This resin does not cause any deformation or cracking problems.