BS ISO 4874:2020 pdf free.Tobacco一Sampling of batches of raw material一General principles.
BS ISO 4874 This document specifies the general principles to be applied when sampling batches of raw tobacco in order to assess either 一the mean value of one or more of its characteristics, or 一the heterogeneity of one or more of its characteristics. Manufactured tobacco products, including products intended for sale or distribution, are specifically not included in the scope of this document. This document is applicable to the sampling of batches of raw tobacco of the following types: a) leaf tobacco: 1) flue cured;2) air cured;3) sun cured;4) fire cured;b) pretreated raw tobacco:1) which has undergone fermentation (in packages not intended for retail or wholesale sales or distribution, in bulk, in chambers);2) which has been partially or completely stemmed;3) which is in the form of stems;4) which is in the form of waste and remnants;5) which has been reconstituted in the form of strips.The contract between the interested parties shall state: a) at what stages of production and delivery sampling shall be carried out;b) the party or parties responsible for carrying out the sampling and under whose control;c) the characteristics to be determined;d) the laboratory or laboratories that will perform the analyses;e) the maximum interval of time admissible between sampling and analysis. (This interval should be as short as possible.)The treatment of damaged sampling units depends on the aim of the analyses.a) If the damage to the tobacco is irrelevant with respect to the characteristics to be determined (for example, disease markings when assessing the length of the leaf), sample damaged units in the same way as undamaged units. b) If the assessment may be affected by the damage, the damaged sampling units shall be sampled separately and a record made. c) If the damage to the tobacco is such that the tobacco is unusable for the assessment of the characteristics to be determined, do not sample that sampling unit. It can be necessary to grade the damage to the tobacco in the damaged sampling units into several classes and obtain sufficient increments from the damaged sampling units. BS ISO 4874 pdf download.