A-A-54273
Instructions. Adequate and accurate instructions for using the dental cement shall accompany each unit package. In addition, the instructions shall include setting time, mixing time, powder-liquid ratio, and method for proportioning and manipulating the cement, including number of drops of liquid required to mix with one scoop of powder to make a mix of 5.2 to 6.3 powder-liquid ratio by weight. Two copies of the instructions shall be forwarded to the contracting officer for information purposes.
The dental cement shall be suitable as a sedative intermediate restorative material which may also be used as a base under amalgam restorations. The cement shall not form lumps, granules, or evolve gas when mixed according to the manufacturer’s instructions.
Physical properties. The cement shall have the following physical properties when tested as specified below. The setting time shall be 7.5 to 9.5 minutes. The compressive strength shall be 9000 pounds per square inch, minimum. The solubility and disintegration shall be 0.12 percent by weight, maximum. The film thickness shall be 50 to 90 microns (0.0020 to 0.0035 inches). The consistency shall be 16.5 to 19.5 millimeters.
Immediate container. Immediate container for the cement powder shall be a plastic bottle. Immediate container for the liquid shall be amber glass bottle with screw cap closure. Each bottle shall be permanently and legibly marked with the lot number, date of manufacture, and inspection test date. Each bottle shall be further marked with the following legend:
“STORE AT CONTROLLED ROOM TEMPERATURE 15°-30°C (59°-86°F)”.
Shelf life. The shelf life of the cement shall be not less than 24 months from date of manufacture when stored at controlled room temperature (59° to 86°F).
Delivery schedule. Not more than 4 months shall have elapsed from the date of manufacture of the cement to the date of delivery to the Government.
Workmanship. The powder and liquid shall be free from all dirt, foreign materials, and impurities which detract from their appearance or impair their serviceability.
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