Castaldo Econosil® Jewelry Molding Rubber is a harder, firmer but still flexible version...
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Superior Quality Molding Rubber
A superior quality medium hardness jewelry molding rubber with extreme tear and tensile strength for every application including spirals, cores, cut-outs & plugs as well as for general purpose use.
Can be used with Econosil® on the outside for additional stiffness or on the inside for additional dimension stability. Can also be used with SuperStretch for cores and spirals.
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