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This standard replaces the part specifying determination of volatiles of GB/T 5009.59-2003 Method for Analysis of Hygienic Standard of Polystyrene Resin for Food Packaging.
The following main changes have been made with respect to GB/T 5009.59-2003 (the previous edition):
——This standard is renamed as "National Food Safety Standard - Food Contact Materials and Articles - Determination of Volatiles in Resins".
National Food Safety Standard
Food Contact Materials and Articles
Determination of Volatiles in Resins
1 Scope
This standard specifies determination method for volatiles in resins in food contact materials and articles.
This standard is applicable to determination of volatiles in polystyrene resin in food contact materials and articles.
2 Principle
The mass of volatiles is the reduced mass of test specimen due to drying for 2h at temperature of 138℃~140℃ and a pressure of 85.3 kPa subtracts the lost mass due to drying.
3 Reagents and Materials
Butanone (C4H8O).
4 Instruments and Apparatus
4.1 Balance: with sensitivity of 0.1mg.
4.2 Ultrasonic cleaner: with working frequency of 35 kHz.
4.3 Vacuum drying oven.
5 Analysis Steps
5.1 Sampling method
Operate according to GB 5009.156.
5.2 Weight loss on drying
Operate according to GB 31604.3 National Food Safety Standard - Food Contact Materials and Articles - Determination of Resin Loss on Drying.
5.3 Volatiles
Weigh 2g~3g (to the nearest of 0.1 mg) of particle specimen and put it in a 50mL beaker (with glass rod) which is weighed accurately after dried, add 20mL of butanone and stir with glass rod to fully dissolve the specimen, carry out ultrasound for 15 min, volatilize the solvent until the test specimen becomes dense and then transfer the beaker into the vacuum drying oven; close the vacuum drying oven, start the vacuum pump and dry for 2h at the temperature of 139℃±1℃ and the pressure of 85.3 kPa, then transfer the beaker into the dryer, cool it for 30 min and then weigh.
Foreword i
1 Scope
2 Principle
3 Reagents and Materials
4 Instruments and Apparatus
5 Analysis Steps
6 Expression of Analysis Results
7 Accuracy
