BS 17409:2020 pdf download – Surfaces for sports areas – Code of practice for the sampling of performance infills used within synthetic turf surfaces

BS 17409:2020 pdf download – Surfaces for sports areas – Code of practice for the sampling of performance infills used within synthetic turf surfaces 4 General The method of sampling employed shall be designed and controlled to ensure that contamination of the increment, lot, sample, test portion or test sample cannot occur. When laboratory samples are being taken for chemical analysis increments and samples shall be stored in containers that are known to not influence the results of the analysis. NOTE Metal or glass containers are considered to satisfy this requirement. All equipment shall be thoroughly cleaned before use. 5 Method 1 — sampling during production 5.1 Sampling plan The main principle of sampling is to obtain a representative sample(s) from a lot of material from which a characteristic is to be determined. If the lot is to be represented by a sample, then every particle in the lot shall have an equal probability of being included in the sample. When these principles cannot be applied in practice, the sampler shall define a judgemental sampling procedure that is designed to ensure the sampling matches as far as possible the outcomes of probability sampling and note any limitations of the procedure used in the sampling plan and sampling report. Obtaining samples that are truly representative of the material produced is easier when the material is falling or moving (for example on a conveyor belt). Therefore, sampling from falling or moving material shall be undertaken wherever possible. A sampling plan shall be prepared before samples are taken. This shall include a specific definition of the lot size and the size and number of increments to be taken. 5.2 Lot size The minimum lot size shall be 10 t and the maximum lot size shall not exceed 120 t of product. NOTE 1 A lot size of 120 t is based on the typical quantity of infill used on a 60 mm full size synthetic turf football field. When determined by the producer the lot size may be defined as: a) a fixed quantity produced between machine settings; b) a fixed quantity in a production day/shift; c) a fixed quantity; d) a quantity produced in a fixed time frame. NOTE 2 Option d) is most appropriate for continuous production with no beginning and no end. 5.3 Sampling point and apparatus Based on health and safety assessments and producer equipment, a fixed sampling point...