1. Check the Material: Is it a Specially Designed Anti-static Material?
Metal Cans (e.g., tinplate, galvanized steel, stainless steel)
They are conductors and have natural static electricity conductivity, but they must be grounded to the earth; otherwise, they will still be charged. Suitable for storing flammable liquids, but the grounding effectiveness needs to be checked regularly.
Ordinary HDPE or PP materials are insulators and easily accumulate static electricity, which is dangerous! Choose containers clearly labeled "Anti-static HDPE" or "Anti-static Modified Plastic." These materials have carbon black or conductive fibers added during production, reducing the surface resistance to within the range of 10⁶–10⁹Ω, meeting anti-static standards.
Composite Structure Cans (Metal Outer Shell + Plastic Liner)
The outer shell can be grounded to conduct static electricity, and if the inner lining has an anti-static coating, it is even safer and an ideal choice for high-risk scenarios.
✅ Judgment Method: Check if the product manual or label indicates "anti-static," "surface resistance <10⁹Ω," or complies with standards such as GB 12158-2024 "General Requirements for Prevention of Static Electricity Accidents."
2. Check the Structural Design: Does it have anti-static functional components?
Grounding Interface: Legitimate anti-static containers will have a metal grounding point or threaded interface on the body for connecting a static grounding clamp to discharge charge.
Conductive Coating/Liner: Some plastic containers have a conductive coating (such as an epoxy system containing carbon nanotubes) on the inner wall, making the whole container conductive, with a surface resistance controlled within the range of 10⁵–10⁸Ω.
Use with Static Elimination Devices: Install an intrinsically safe human body static eliminator at the filling port or add static eliminator rods to the pipeline to actively neutralize static electricity.
✅ On-site testing recommendations: Use a surface resistance tester to measure the surface resistance of the can. If the value is between 10⁵ and 10⁹ Ω, it is considered to have good antistatic performance.
3. Check the usage environment and operating procedures. Even if the container itself is antistatic, improper operation can still cause risks:
<100Ω.
Control flow rate: When filling flammable liquids, the initial flow rate should be <=1m/s. After immersing the inlet 200mm, the flow rate can be increased to <=4.5m/s to reduce frictional static electricity.
Avoid top filling: Flammable liquids must not be poured directly from the top of the can. Bottom feeding or a loading arm extending below the liquid surface should be used to prevent splashing and static electricity generation.
Personnel protection: Operators should wear antistatic work clothes and conductive shoes, and touch the static discharge column before entering the can.
⚠️ Special attention should be paid to high-temperature environments: Increased temperature will reduce the surface resistance of materials, which may seem beneficial, but it will also accelerate solvent evaporation and increase the concentration of explosive gases. Therefore, anti-static requirements are more stringent at high temperatures, and vigilance should not be relaxed.
