A-A-53389
14 March 1988
COMMERCIAL ITEM DESCRIPTION
STONE, ARTIFICIAL, DENTAL
The General Services Administration has authorized the use of this Commercial Item Description as a replacement for Federal Specification U-S-746D.
Salient Characteristics:
This commercial item description covers artificial dental stones suitable for making dental stone casts and dies. The stones shall be furnished in the following types and nominal sizes, as specified:
Type I. – High strength stone
Size 1. – 50 grams
Size 2. – 4 1/2 pounds
Size 3. – 35 pounds
Type II. – Low strength stone
Size 3. – 35 pounds
Size 4. – 25 pounds
Type I, high strength artificial stone powder, when mixed with water according to manufacturer’s instructions, shall be suitable for fabrication of master casts and dies.
Type II, low strength artificial stone powder, when mixed with water according to manufacturer’s instructions, shall be suitable for fabrication, flasking and mounting of diagnostic casts.
Composition and physical properties. The artificial stone shall comply with American Dental Association (ADA), Specification No. 25 (Dental Gypsum Products) for composition and physical properties. Low strength stone shall comply with Type III of ADA Specification No. 25. High strength stone shall comply with Type IV of ADA Specification No. 25. Test procedures for setting time, fineness, setting expansion, compressive strength, reproduction of detail, and testing consistency shall be as specified in ADA Specification No. 25.
Color. High strength stone powder shall be furnished in any pale, pastel shade of color, except buff or yellow. Low Strength stone powder shall be furnished in a buff of light yellow color only.
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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