How to perform stress testing on glass candle jars
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Sunny Glassware
2023-11-21 17:19:38
Stress testing on glass candle jar is a routine quality inspection operation. Generally, the stress test is done 2 hours after the glass candle jar comes out of the kiln. It is best for us to choose the time to test after 3-4 hours or the night shift the next day. The test is strictly in accordance with BV standards or customer requirements.
The stress test is divided into two parts:
1.Annealing test
Use a glass knife to score circular and cross-shaped lines on the inner bottom of the glass candle jar. It is required to score lines deep into the glass, and then put the glass candle jar into room, temperature water for 15 minutes. The normal temperature of room temperature water is 20-25 degrees (room temperature water temperature recognized by the laboratory). If it is taken out after 15 minutes and there are no cracks, the annealing test will be considered qualified.
2.Thermal shock test
Perform thermal shock testing by exposing the glass candle jar to rapid temperature changes. The experiment requires a temperature difference of 50 degrees between hot and cold water. Cold water (normal temperature water) requires a constant temperature of 21 degrees, plus or minus 1 degree. Then the constant temperature of hot water must reach at least 71 degrees, plus or minus 1 degree.
Raise the water temperature to 71 degrees, maintain a constant temperature, put the glass candle jar into the constant temperature water tank, close the water tank cover, and leave it for 5 minutes. After 5 minutes, take out the glass candle jar, pour out the hot water, and remove the cup within 15 seconds. Put it into constant temperature water of 21 degrees, close the sink cover, and take it out after 30 seconds. If there is no explosion or crack, the thermal shock test is qualified.
Remember, when performing stress testing on a glass candle jar, always prioritize safety. Wear protective gloves and eyewear, and handle the glass candle jar with care to avoid injury from potential breakage.