OVER 450,000 Acrastone Bathtubs SOLD! Become the next proud owner of one today! American Bath Factory’s AcraStone is the only material durable enough to carry our exclusive Limited Lifetime warranty. You can count on your American Bath Factory bathtub to be beautiful, strong and dependable for years to come. AcraStone is thick, strong, and warm to the touch. The color is chip and wear resistant with a porcelain-like surface inside and out. No other bathtub in the industry, including our own cast iron bathtubs can beat AcraStone’s features.