Shrinkage Modifiers, Low-profile Additives

Using fillers as a partial replacement for a reactive resin which shrinks on curing can reduce the shrinkage of the completed system. Any inert filler will decrease shrinkage, but the most commonly used are silica, clay, calcium carbonate, alumina talc, powdered metals, and lithium aluminium silicate. 

Thermoplastic additives in RP help control shrinkage during cure, permitting good control of tolerances, dimensional accuracy, and surface finish to A classification. 

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