Casting Waxes Feature a unique blend of natural and synthetic waxes, assuring complete burnout without residue. Extremely low contraction provides for less shrinkage and better fitting wax patterns. Its high degree of viscosity accelerates the wax build-up. It is easy to carve and does not crumble or chip during scraping, drilling or milling. Its toughness makes it very suitable for long span bridges. 40/40 Green MDL Dental Casting Wax Melting Point = 134ºF – 56.5ºC. It is the softest in our line from 40/40 green 40 through 90.