Super-strength gypsum cement recommended where extreme accuracy and greater surface hardness are required, as in duplicator models. Harder and stronger than HYDROCAL A-11 and HYDROCAL B-11 cements, UltraCal 30 cement has the lowest expansion of any rapid-setting gypsum cement available. Has a gradual set and long period of plasticity. Ideal for splash-casting molds and models for phenolic, polyester and epoxy resins. It was designed to give the pattern making industry the ultimate in a gypsum cement tooling medium. MIX RATIO: The manufacture recommended mix-ratio of Ultra Cal 30 is (38 parts water to 100 parts) Ultra Cal 30 by weight. The average setup time is 25-35 minutes when manually mixed. Please note that parts can be in grams, ounces or pounds etc. Do not mix with your hands, A paint paddle or electric paint mixer is recommended. WARNING: This product is for making molds of industrial patterns only. When mixed with water, ultra cal undergoes a chemical reaction which causes it to harden and then slowly become very hot and highly alkaline (corrosive to skin like drain cleaner.) If mixed incorrectly this process can happen very rapidly. DO NOT attempt to make a mold enclosing any part of the body using this material. Failure to follow these instructions can cause severe chemical burns that may require surgical removal of affected tissue. Dust from products may cause eye, skin, nose, throat, or respiratory irritation. Use eye, skin, and respiratory protection in accordance with good industrial hygiene practices. Keep out of reach of children