1 Scope
This standard specifies the measuring methods of hygienic index of food vessel, tableware and packing film which are made of Polyethylene, Polystyrene and Polypropyrene.
This standard is applicable to the measuring methods of hygienic index of such tools and pipes as food vessels, tableware and packing films which are made of Polyethylene, Polystyrene and Polypropyrene.
2 Sampling Method
Each lot of the samples shall be taken according to 0.1% in proportion and the sampling volume of smaller lots shall be no less than 10 (calculated at 500mL volume/loaf and if it is less than 500mL/loaf, the specimen shall be doubled). Among which, half the number shall be tested and the other half shall be preserved for two months for arbitration analysis and shall be marked with product name ,lot number and date of sample. Clear the specimen for the next application.
3 Soaking Conditions
3.1 Water: 60℃ soaked for 2h.
3.2 Acetic acid (4%): 60℃, soaked for 2h.
3.3 Ethanol (65%): Room temperature, soaked for 2h.
3.4 Normal hexane: Room temperature, soaked for 2h.
The soak solution mentioned above shall be adopted according to 2mL for per square centimeter of contact area and 2/3~4/5 volume of soak solution shall be adopted in the vessel.
Foreword I
1 Scope
2 Sampling Method
3 Soaking Conditions
4 Potassium Permanganate Consumption
5 Evaporation Residues
6 Heavy Metal
7 Decolourization Test
