It is important to note that the excessive plasticity of acrylic is a serious minus, so the higher the plasticity of acrylic the worse the plumbing, which is made of it. By the way, the rigidity of the acrylic bathtub is ensured by using special reinforcing layers of epoxy resin and fiberglass. The more reinforcing layers the stronger the acrylic bathtub. Another difference between acrylic plumbing is its small weight, so the same acrylic bathtub weighs only 15 kg.