The ASTM C777 test method is used to measure the sulfide resistance of ceramic decorations on glass to ensure their durability. This test qualitatively determines the degree of attack upon a ceramic decoration item by a nominal 4% acetic acid solution containing 1 mL of saturated sodium sulfide solution per 100 mL of the acetic acid solution, through a visual assessment. ASTM C777 (Standard Test Method for Sulfide Resistance of Ceramic Decorations on Glass) also gives an indication of performance when the decorations are subjected to sulfide attacks.
ASTM C777 Sulfide Resistance of Ceramic Decorations on Glass
What is ASTM C777?
ASTM C777 Equipment and Sample Preparation Guide
A glass (of known resistance) with ceramic decorations is used as an ASTM C777 test specimen. A test container, heating equipment, balance, safety gear, and a fume hood are required for this testing. The chemicals required for this test are acetic acid, sodium sulfide, and distilled water.
What are the Testing Procedure and Requirements for ASTM C777?
The analyst immerses the specimen in a 4% acetic acid solution containing 1 mL of saturated sodium sulfide solution per 100 mL of acetic acid solution, according to ASTM C777, using a suitably closed container at room temperature. The analyst keeps a duplicate piece of ware (not exposed to the solution) with the decoration under study to help measure the degree of chemical activity on the test specimen. After 15 minutes, the analyst removes the specimen from the solution and allows it to air-dry. After another 15 minutes, the analyst examines the specimen to determine the severity of the attack.
Analysis Results and Interpretation
The ASTM C777 test method is used to measure the sulfide resistance of ceramic decorations on glass in order to ensure their vital durability.
The specimen being tested, as well as the decorating substance utilized in ASTM C777, must be recognized. The degree of attack is graded according to the following visual test grades:
- No signs of chemical attack.
- When viewed at a 45° angle, there is an appearance of stain on the surface, although it is not visible if the angle is less than 30°.
- A distinct stain that does not distort reflected light.
- The surface is dull or matte, with the possibility of chalking.
Updated on July 21, 2026
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