BS/EN 71-3-1995 pdf download.Safety of toys -Part 3 : Migration of certain elements.
7 Selection of test portions
A laboratory sample for testing shall consist of a toy either in the form in which it is marketed, or in the form in which it is intended tobe marketed. Test portions shall be taken from accessible parts (see EN 71-1) of a single toy sample, i.e. identical materials in the toy may be combined and treated as a single test
portion but additional toy samples shall not be used. Test portions are only permitted to be composed of more than one material or colour where physical separation, e.g. dot printing, patterned textiles or mass limitation reasons, precludes the formation of discrete specimens. (See Annex D.)
NOTE The requirement does not preclude that test portions can be taken from materials in a form such that they are representative of the relevant material specified above and the substrate upon which they are deposited. (See Annex D.)
Test portions where less than 10 mg of material are available are not tested.
8 Preparation and analysis of test portions
8.1 Coatings of paint, varnish, lacquer, printing ink, polymer and similar coatings
8.1.1 Sample removal/preparation procedure
Remove the coating from the laboratory sample by mechanical means at room temperature and comminute it at a temperature not exceeding ambient. Obtain a test portion of not less than 100 mg passing through a metal sieve of aperture 0,5 mm (see 6.2.1).
Where there is only between 10 mg and 100 mg of comminuted uniform coating available this shall be tested in accordance with 8.1.2 and the quantity of the appropriate elements shall be calculated as
if 100 mg of test portion had been used and the mass of the test portion shall be reported under lOe).
In the case of coatings that by their nature cannot be corn minuted (e.g. elastic/plastic paint) remove a test portion from the laboratory sample without comminuting the coating.
8.1.2 Test procedure
Using the appropriate sized container (see 6.2.6). mix the test portion so prepared with 50 times its mass of an aqueous solution at (37 ± 2) °C of c(HC1) = 0,07 molll (see 6.1.1). Where the test portion has a mass of between 10 mg and 100 mg. mix the test portion with 5,0 ml of this solution at (37 ± 2) °C. Shake for I mm. Check the acidity of the mixture. If the pH is greater than 1,5 add dropwise, while shaking the mixture, an aqueous solution ofc(HCI) approximately 2 molll (see 6.1.4) until the pH is between 1.0 and 1,5. Protect the mixture from light. Agitate the mixture at (37 ± 2) °C (see 6.2.5) for 1 h continuously and then allow to
stand for 1 h at (37 ± 2) °C.
8.2.2 Test procedure
Follow the procedure in 8.1.2.
8.3 Paper and paper board
8.3.1 Sample removal/preparation procedure
Obtain a test portion of not less than 100 mg of the paper or paper board.
If the laboratory sample is not uniform in its material, a test portion shall be obtained from each different material present in a mass of not less than 100 mg. Where there is between 10 mg and 100 mg of uniform material the mass of the test portion shall be reported under lOe) and the quantity of the appropriate elements shall be calculated as if 100 mg of the test portion had been used.
If the paper or paper board to be tested is coated with a coating of paint, varnish, lacquer, printing ink, adhesive or similar coating, test portions of the coating shall not be taken separately. In such cases test portions shall be taken from the material in accordance with this subclause in a way that they also include representative parts of the coated area. Test portions so obtained shall be taken in accordance with relevant methods specified in this subclause and this shall be reported under lOe). (See Annex D.)
8.3.2 Test procedure
Macerate the test portion so prepared with 25 times its mass of water (see 6.1.7) at (37 ± 2) °C so that the
resulting mixture is homogeneous. Quantitatively transfer the mixture to the appropriate sized container
(see 6.2.6). Add to the mixture an aqueous solution of c(HCI) = 0,14 mol/1 (see 6.1.2) at (37 ± 2) °C at
25 times the mass of the test portion.
Shake for 1 mm. Check the acidity of the mixture. If the pH is greater than 1,5 add dropwise, while shaking the mixture, an aqueous solution of c(HCI) approximately 2 mol/l (see 6.1.4) until the pH is between 1,0 and 1,5. Protect the mixture from light. Agitate the mixture at (37 ± 2) °C (see 6.2.5) for I h continuously and then allow to stand for 1 h at (37 ± 2) °C.
Without delay, efficiently separate the solids from the solution, firstly by filtration using a membrane filter (see 6.2.3), and if necessary, by centrifuging at up to 5 000g3) (see 6.2.4). Separation shall be completed as soon as possible after the completion of the standing time; centrifuging shall take no longer than 10 mm and shall be reported under lOc).
If the resulting solutions are to be kept for more than the working day prior to analysis they shall be stabilized by addition of hydrochloric acid so that the concentration of the stored solution is approximately c(HC1) = 1 mol/1.BS/EN 71-3-1995 pdf download.