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ANSI/ADA Specification No. 20-1972 (Reaffirmed 199

Dental Duplicating Material

This specification covers thermo-reversible and nonreversible (chemical setting) duplicating materials for use in the dental laboratory. Duplicating materials covered by this specification are classified as Type I - thermo-reversible materials (which includes Class 1 - Hydrocolloidal and Class 2 - Nonaqueous organic thermoplastic) or Type II - Nonreversible (which includes Class 1 - Hydrocolloidal and Class 2 - Nonaqueous organic).

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American Dental Association [ada]

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