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Operation Steps：
1. Turn on the oven power switch and heat to 230℃ for constant temperature. 2. Put the glass lid into the oven for 60 min. 3. Put the glass lid out of oven and throw it into the water (temperature 20℃±5℃). 4. Check the glass lid broken or not. No broken is qualified. |
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Operation Steps：
1. Prepare the glass lid; turn on the refrigerator power switch and adjust to 0℃±2℃. 2. Put the glass lid into the refrigerator （No overlapping）and close the door for 30 min. 3. Put water into the bucket to 2/3 of the total capacity and heat the water to 100℃. 4. Take the glass lid out of the refrigerator and put it into the 98℃±2℃ water bucket quickly. 5. Check the glass lid broken or not. No broken is qualified. |
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