Basic requirements
Metal materials and products shall comply with the provisions of GB 4806.1.
2.1 Raw material requirements
(1)The metal substrates, metal coatings and welding materials used in metal materials and products should not cause harm to human health.
(2)Metal material and product manufacturers should control the substances used and residual in the process of metal surface treatment (such as pickling, oxidation, phosphating, polishing, anti-rust oiling, etc.) so that the amount of migration into food meets the requirements of GB4806.1.
(3)Metal substrates and metal coatings used on food contact surfaces should not use lead, cadmium, arsenic, mercury, antimony, beryllium and lithium as alloying elements, and the content of impurity elements should meet the requirements of Table 1.
|
Metal substrates and metal coatings |
Impurity Elements |
Content (percentage)/% |
|
Stainless Steel |
Arsenic (As) |
≤0.01 |
|
Cadmium (Cd) |
≤0.01 |
|
|
Lead (Pb) |
≤0.01 |
|
|
Thin steel sheets for food packaging |
Arsenic (As) |
≤0.03 |
|
Cadmium (Cd) + Lead (Pb) |
≤0.01 |
|
|
Aluminum and aluminum alloy materials |
Arsenic (As) |
≤0.01 |
|
Cadmium (Cd) + Lead (Pb) + Mercury (Hg) |
≤0.01 |
|
|
Metal substrates and metal coatings other than stainless steel, thin steel sheets for food packaging, aluminum and aluminum alloy materials |
Arsenic (As) |
≤0.03 |
|
Cadmium (Cd) |
≤0.01 |
|
|
Lead (Pb) |
≤0.01 |
2.2 Sensory Requirements
|
Item |
Requirements |
|
Sens |
The surface in contact with food should be moderately clean, the coating should not crack or peel off, the welded part should be smooth and free of pores, cracks, or burrs |
|
Soak Solution |
The Soak Solution obtained from the migration test should not have a peculiar smell |
2.3 Physical and Chemical Indicators
2.3.1 Migration index of impurity elements
The migration index of impurity elements shall comply with the requirements of Table 3.
Table 3 Migration index of impurity elements
| Items | Index | Test Standards | |
| Arsenic(As)*/(mg/kg) | ≤ | 0.002 | GB 31604.49 |
| Cadmium(Cd)/(mg/kg) | ≤ | 0.002 | |
| Lead(Pb)/(mg/kg) | ≤ | 0.01 | |
| Antimony(Sb)/(mg/kg) | ≤ | 0.04 | |
| For uncoated iron frying pans, the indicator is 0.018 mg/kg. | |||
2.3.2 Alloy element migration index
The alloy element migration index should comply with the requirements of Table 4.
Table 4
| Items | Index | Test Standards |
| Aluminum (Al¹/(mg/kg) ≤ | 1 | GB 31604.49 |
| Chromium (Cr)/(mg/kg) ≤ | 0.25 | |
| Cobalt (Co)/(mg/kg) ≤ | 0.02 | |
| Copper (Cu)/(mg/kg) ≤ | 4 | |
| Manganese (Mn)/(mg/kg) ≤ | 2.0 | |
| Molybdenum (Mo)/(mg/kg) ≤ | 0.12 | |
| Nickel (Ni)/(mg/kg) ≤ | 0.14 | |
| Tin (Sn)=/(mg/kg) ≤ | 100 | |
| Zinc (Zn)/(mg/kg) ≤ | 5 | |
| When the material composition is known, the elements to be tested can be determined based on the material composition (for example: martensitic stainless steel with the grade of 32Cr13Mo needs to measure manganese, chromium, nickel, and molybdenum; for metal coatings, the elements to be tested are determined based on the metal composition of the coating). For uncoated aluminum and aluminum alloy materials and products, this indicator is 5mg/kg. Not applicable to tin-plated steel plate containers. | ||