| http://www.w3.org/ns/prov#value | - Preferably, the molds and the dies comprise a rigid material selected from metals and their alloys, for example brass and other copper alloys, aluminum, and steels including carbon and stainless steel; and other non-elastomeric materials such as thermosetting and thermoplastic resins, for example polyester, epoxy resins, furan resins; hard cast polyurethanes ; ceramics; composites and laminates.
|
