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Carbon Black

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- toluene extractable: maximum 0.1%, determined according to ISO method 6209

- UV absorption of cyclohexane extract at 386 nm: <0.02 AU for a 1 cm cell or <0.1 AU for a 5 cm cell, determined according to German BfR, BIII, Reinheitsprüfung von Rußen, Stand 1.7.1972

- benzo(a)pyrene content: max 0.25 mg/kg Carbon Black.

Compliance testing of the end product cannot be performed because the ingredients are not present. The company that uses a material with restrictions has to have data that the materials used do indeed comply with the restrictions as laid down in the legislation.

Colour release

When food is in contact with food contact material, the colour of the food contact material must remain on the food contact material and may not colour the food. Staining of the food is an unacceptable change of the food as described in EC Regulation 1935/2004. In both the German and Dutch legislation, tests are made to check if colour is released from the packaging. In both sets of tests food contact material is brought in contact with white filter paper which is wetted with a food simulant for a certain time and temperature under a constant pressure. Then the filter paper that was in contact with the food contact material should be inspected and compared with a filter paper which was also wetted and stored under identical conditions, but was not in contact with the sample to be tested. No colour release or differences between the filter paper in contact with the sample and the blank should be detectable.

Volatiles

For silicon materials some volatile components can remain in the silicon material after polymerisation. These volatiles can be removed by treating the material at high temperatures. In both France and Germany a maximum amount of volatiles that may be present is laid down in the legislation. The method of determination is:

• Prepare the silicon material (cut to prescribed sizes).

• Remove water from the silicon material using water free calcium chloride.

• Determine the weight of the silicon material.

• Expose the silicon material for a certain time to a certain temperature.

• Determine the weight of the silicon material.

• Calculate the weight loss.

This is a very straightforward method, which can easily be used to determine the total amount of volatiles. This is quite important because silicon materials are used more and more, and the new applications are often at high temperatures, such as silicon bake forms for use in ovens.

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