1.What are the permitted applications of galvanized steel?
Structural support: load-bearing parts such as equipment racks, pipe supports, and operating table frames.
Dry food storage: granaries, dry material storage tanks (only for storing grains and beans with a moisture content of ≤12%).
External protective shell: equipment housing, distribution box (not in contact with food or detergents).
2.What are the risks of using galvanized steel in the food industry?
Zinc migration pollution: heavy metals in food exceed the standard
Galvanized layer damage: zinc scraps mixed into food
Cleaning agent corrosion: zinc dissolution + coating failure
Microbial growth: Plating pores harbor bacteria
3.What are some compliant alternative materials?
Stainless steel is preferred
AISI 304/316L: used for containers, pipes, and knives that come into direct contact with food (in compliance with GB 4806.9-2016).
Surface treatment: electrolytic polishing (Ra≤0.4μm) to reduce microbial attachment.
Food grade polymers
PP (polypropylene), PE (polyethylene): containers, conveyor belts.
PTFE (polytetrafluoroethylene): seals, bearings.
Specially coated carbon steel
Food grade epoxy coating: NSF/ANSI 51 certified (such as epoxy phenolic resin), used for the inner wall of the tank.
Glass lining (enamel): acid and alkali resistant, used for reactors.
4.What are the legal application conditions for galvanized steel?,
If galvanized steel must be used, it must meet the following requirements: Secondary isolation protection ◦ Cover the galvanized surface with a food-grade resin coating (thickness ≥ 250μm) and pass the 3% acetic acid migration test.
Strict quality certification ◦ The galvanizing process complies with ISO 1461, and the purity of the zinc ingot is ≥ 99.995%.
Scope of use restrictions: Only used in non-contact areas, and ≥ 50cm away from the food contact surface.
5.What are the consequences of illegal use?
Food safety incidents: Zinc contamination leading to vomiting and diarrhea (acute toxic dose > 200 mg).
Legal risks: Violation of Article 34 of the Food Safety Law (China), with a maximum fine of 30 times the value of the goods.
Brand reputation damage: Product recall incidents.