Hygienic standard for polytetrafluoroethylene coat

2022-09-21
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Hygienic standard for polytetrafluoroethylene used as inner coating of food containers GB 11678

national standard of the people's Republic of China national standard of the people's Republic of China GB

hygienic standard for polytetrafluoroethylene used as inner coating of food containers

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1 subject content and scope of application

this standard specifies the hygienic requirements for PTFE coating on the inner wall of food containers

this standard is applicable to Teflon coating composed of Teflon as the main raw material and certain additives, which is applied to metal surfaces such as aluminum "materials and iron plates. After high-temperature sintering, it is used as an anti stick coating for contacting non acidic food containers, and the service temperature is limited to below 250 ℃

2 reference standard

gb 5009.18 determination of fluorine in food

gb 5009.60 analysis method of hygienic standard for polyethylene, polystyrene and polypropylene molded products for food packaging

3 sensory indicators

3.1 the film surface is flat and smooth, with uniform color, no spots and cracks

3.2 the film soaking solution is colorless and odorless, and the film does not fall off

4 physical and chemical indicators

physical and chemical indicators are shown in the following table:

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evaporation residue

distilled water, boil for 0.5h,the, Place at room temperature for 24h ≤ 30

n-hexane, room temperature for 24h ≤ 30

4% acetic acid, boil for 0.5h, place at room temperature for 24h ≤ 60

potassium permanganate consumption

distilled water, boil for 0.5h, place at room temperature for 24h ≤ 10

details of national standards for related industry testing

chromium (CR)

4% acetic acid, boil for 0.5h, place at room temperature for 24h ≤ 0.01

fluorine (f)

distilled water, boil.0.5h, Place at room temperature for 24h ≤ 0.2

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this standard was drafted by Shanghai Institute of food hygiene supervision and inspection and Shanghai Institute of organic fluorine materials

the main drafters of this standard are zhuyiyan, guzhenhua, luwenhua and guwenjin

this standard is interpreted by the food hygiene supervision and Inspection Institute of the Ministry of health, a technical centralized unit entrusted by the Ministry of health

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