BS EN 16711-1:2015 pdf free

BS EN 16711-1:2015 pdf free.Textiles – Determination of metal content Part 1: Determination of metals using microwave digestion.
6 Test specimen sampling
6.1 Natural and man-made textiles
Cut from the textile specimen (with a sharp pair of scissors made of noncorrosive material, preferably of ceramics) a representative subsample of approximately 0,5 g and record the mass to the nearest 0,1 mg. If the textile article is composed of several parts of textile products, such as knitted cuffs or lining, all the different types of materials have to be tested as a representative composite specimen with equal parts of each component. Select the number of parts that can be collected as a composite specimen in relation to the detection and quantification limits of the instrumental equipment. Weigh out materials that cannot be separated as one specinwn. Consider also different colours of the material for sampling. Avoid any contact with metal articles, especially in wet conditions or with corrosive surfaces.
6.2 Garment components with painted and other similar surface coatings
For products coated with paint or a similar surface coating, remove and digest the coating separately from the substrate material. Care should be taken to remove as little of the substrate as possible. It may be necessary to add a few drops of a solvent, such as dichloromethane, to soften the paint and aid in its removal from the substrate. If used, such solvent shall be evaporated fully prior to analysis. The scraped paint shall be finely divided to help in the digestion. Scrape approximately 100 mg to 200 mg of paint from the product. If it is not possible to collect this much paint it may be necessary to combine more than one unit of such product to collect sufficient paint.
6.3 Metallic products
When preparing a sample, the laboratory shall make every effort to assure that the aliquot removed from a component part of a sample is representative of the component to be tested, and is free of contamination.
If the item is coated with paint or a similar surface coating, the coating shall be removed and analysed, separately from the base metal, for metal content as described in 6.2. Component parts of children’s products, including metal jewellery items, generally weigh several grams or more, and an aliquot (with no paint or similar surface coating) will have to be obtained. Samples should be cut or ground into many small pieces to increase the rate of dissolution. If used, grinding apparatus (such as a rotary grinding tool with disposable grinding bits) must be thoroughly cleaned to prevent cross-contamination.BS EN 16711-1 pdf download.