1.Temperature changes: Rapid changes in temperature can cause the glass to crack, especially if the glass is not designed to withstand extreme fluctuations. Placing a hot jar on a cold surface, or vice versa, can put pressure on the glass, causing it to break.

2.Glass Defects: Sometimes, glass jars may have internal defects or inclusions that weaken their structure. These defects can cause the glass to fail unexpectedly.

3.Pressure build-up: Certain candles may release gas or vapor during burning, and if the jar is not designed to handle the pressure, it may explode due to internal pressure build-up.

4.Thermal Shock: Pouring a hot liquid into a cold jar, or vice versa, can cause a thermal shock that can cause the glass to shatter.

5.Physical Damage: If the jar is chipped, cracked, or damaged in any way, it may weaken the glass, making it more likely to shatter.

6.Inferior Materials: Cheap or inferior glass jars may break more easily, especially when exposed to temperature changes or pressure.

If this happens to you, it is important to handle the glass jar with care. Always use appropriate containers that withstand the intended use and inspect them for any defects or damage before use. If the accident is unexpected and cannot be explained by any of the above reasons,maybe you can contact Wuhu YE Glass Products Co.,ltd.