A-A-54273
Examination. The impression material shall be examined for defects including, but not limited to, those listed below.
Defects.
Package does not contain all specified components.
Powder not homogenous or free of extraneous material.
Liquid not clear of has significant color.
Bottle for liquid not amber or does not have screw cap closure.
Loose caps, broken bottles, leaks, etc. present.
Marking of immediate containers not as specified.
Instructions missing, incorrect, incomplete, or illegible.
Tests. Tests shall be conducted to determine compliance with specification requirements.
Preparation of test specimens. The preparation of test specimens shall be conducted at a temperature of 70 to 75°F, and 45 to 55 percent relative humidity with a powder-liquid ratio of 5.2 to 6.3 by weight (standard consistency).
Consistency. The procedure for the consistency test shall be as described in American Dental Association (ADA) Specification No. 30 for Dental Zinc Oxide-Eugenol Type Restorative Materials, except that a 520 gram load (500 gram weight and 20 gram glass plate) shall be applied 2 minutes after the mix is started. The load shall be applied for 8 minutes. Then consistency shall be measured.
Setting time. A mix of cement using 0.25 ml of liquid and an amount of powder in proportion shall be loaded into a polyethylene crown form cap with approximate internal dimensions of 9.5 mm diameter by 7 mm deep. Type A durometer hardness shall be determined as described in ASTM designation D2240. Readings shall be taken at 0.5 minute intervals. Hardness shall be plotted against time, and a setting time in minutes shall be interpolated value of time when durometer reading equals 50. Setting time shall be reported to the nearest 0.5 minute.
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