BASIC RULES NECESSARY FOR TESTING MIGRATION IN SIMULANTS
The determination of migration in simulants is to be carried out using the simulants laid down in Chapter I of this Annex and under the test conditions specified in Chapter II of the Annex.
CHAPTER I
Simulants
1. General case: plastic materials and articles intended to come into contact with foodstuffs of all types
The tests are to be carried out using all the simulants mentioned below, taking a fresh sample of the plastic material or article for each simulant:
- distilled water or water of equivalent quality (= simulant A),
- 3 % acetic acid (w/v) in aqueous solution (= simulant B),
- 15 % ethanol (v/v) in aqueous solution (= simulant C),
- rectified olive oil (1); if for technical reasons connected with the method of analysis it is necessary to use different simulants, olive oil must be replaced by a mixture of synthetic triglycerides (2) or by sunflower oil (= simulant D).
2. Special case: plastic materials and articles intended to come into contact with a single foodstuff or a specific group of foodstuffs
The tests are to be carried out:
- using only the simulants specified as appropriate for the foodstuff or group of foodstuffs in the list referred to in Article 2 (3),
- where the foodstuff or group of foodstuffs is not included in the list referred to in the first indent, selecting the simulant or simulants prescribed in Section 1 which correspond most closely to the extractive capacity of the foodstuff or group of foodstuffs.
CHAPTER II
Test conditions (times and temperatures)
1. The migration tests are to be carried out, selecting from the times and temperatures specified in the table those which correspond most closely to the normal or foreseeable conditions of contact for the plastic materials or articles being studied.
2. If a plastic material or article is intended to be used successively at short intervals in several of the conditions of contact referred to in column 1 of the table, migration will be determined by subjecting that material or article successively to all the corresponding test conditions specified in column 2, using the same simulant.
3. For a given test time, where a plastic material or article passes the test at the higher temperature, the test need not be repeated at the lower temperature.
For a given test temperature, where a plastic material or article passes the test over the longer time, the test need not be repeated over the shorter time.
(1) Characteristics of rectified olive oil:
- iodine index (Wijs) = 80 to 88,
- refraction index at 25 °C = 1;4665 to 1;4679,
- acidity (expressed in % of oleic acid = 0;5 % maximum,
- peroxide index (expressed in milli-equivalents of oxygen per kg of oil) = 10 maximum.
(2) Characteristics of the standard synthetic triglycerides mixture as described in K. Figge's article, 'Food cosmet. Toxicol' 10 (1972) 815.
TABLE
Test conditions (times (t) and temperatures (T)) to be chosen according to conditions of contact in actual use
1.2 // // // Conditions of contact in actual use // Test conditions // // // 1 // 2 // // // 1. Contact time: t > 24 hours // // 1.1. T µ 5 °C // 10 days at 5 °C // 1.2. 5 °C < T µ 40 °C (1) // 10 days at 40 °C // 2. Contact time: two hours µ t µ 24 hours // // 2.1. T µ 5 °C // 24 hours at 5 °C // 2.2. 5 °C < T µ 40 °C // 24 hours at 40 °C // 2.3. T > 40 °C // In accordance with national laws // 3. Contact time: t < two hours // // 3.1. T µ 5 °C // Two hours at 5 °C // 3.2. 5 °C < T µ 40 °C // Two hours at 40 °C // 3.3. 40 °C < T µ 70 °C // Two hours at 70 °C // 3.4. 70 °C < T µ 100 °C // One hour at 100 °C // 3.5. 100 °C < T µ 121 °C // 30 min at 121 °C // 3.6. T > 121 °C // In accordance with national laws // //
(1) For plastic materials and articles in contact with foodstuffs for which a preservation temperature of less than 20 °C is specified on the labelling or by law, the test conditions will be 10 days at 20 °C.
4. Where the plastic material or article may in actual use be employed under any conditions of contact time or temperature, only the 10-day tests at 40 °C and the two-hour tests at 70 °C are to be carried out, these being conventionally regarded as the most stringent.
If simulant D is used (rectified olive oil or substitutes for it), only the 10-day test at 40 °C is to be carried out.
5. If it is found that carrying out the tests under the conditions specified in the table causes physical or other changes in the plastic material or article which do not occur under normal or foreseeable conditions of use of that material or article, the migration tests should be carried out under conditions more appropriate to the specific case.