The Aqua-Quench 4000 series widens the range of steel products that can be successfully heat treated using polymer-based technology. Aqua-Quench 4000 quenchants are ideal for low- and high-hardenability steel products. They also provide slow cooling rates in the convection phase and flexible quenching speeds to make them suitable for applications typically limited to oil quenching, including pistons, forgings and other high-hardenability steel products. Aqua-Quench 4000 products are compatible with most other water-based quenchant technologies, making it possible for manufacturers to switch products without changing out the quench tank.