Although wax, in one form or another, has been used for investment casting patterns for centuries, a new inovative foam material is proving itself as a viable replacement for as a pattern material for everyday production use- even in demanding military applications.
Over the last several years, the use of direct patterns (patterns created without the use of tooling or machining, usually by a rapid prototyping technique) has become increasingly accepted in the investment casting industry.
F101 is a water blown polyurethane foam made of confidential polymeric blends. All substances used to manufacture F101 are listed on the TSCA inventory. No halogen based flame retardants or blowing agents (CFC’s or HCFC’s) are used in the manufacture of this foam. (From MSDS)
This is a stable material. Upon decomposition, this product emits carbon monoxide, carbon dioxide and/or low molecular weight hydrocarbons. Tests conducted according to AITM 3.0005 show under the Flaming and Non-Flaming conditions gas levels well below the max accepted levels. The average concentration (in parts per million, ppm) of the following gas components of smoke did not exceed the limits listed in the ABD 00031:
Coefficient Of Thermal Expansion (CTE ):