Liquid nitrogen itself is non-flammable and non-explosive. However, if the tank is ​hermetically sealed​ or its pressure relief valve fails, the liquid nitrogen will vaporize and expand to     about 700 times its original volume. This pressure buildup can cause the tank to rupture. Always use certified containers with functional pressure relief devices and ​never seal the tank mouth​.

Liquid nitrogen is extremely cold (-196°C / -321°F). Skin contact can cause severe cold burns or frostbite. ​Always wear appropriate Personal Protective Equipment (PPE)​, including ​cryogenic gloves, safety goggles/face shield, a long-sleeved lab coat, and pants that cover your ankles.

Pre-cooling (New/Idle Tanks)​: For new or long-unused tanks, first slowly add a small amount of LN2 (about 1/10 of capacity) to pre-cool the inner tank. Wait until the boiling subsides before filling completely.- ​Slow Filling: Use a dedicated funnel and pour slowly along the inner wall to prevent splashing.- ​Fill Limit: Do not fill beyond ​80%-90%​​ of total capacity, and ensure the liquid level does not touch the neck tube. Sufficient space must be left for liquid expansion and gas evaporation.