ISO 4874:2020 pdf download

ISO 4874:2020 pdf download

ISO 4874:2020 pdf download.Tobacco — Sampling of batches of raw material — General principles
1 Scope
This document specifies the general principles to be applied when sampling batches of raw tobacco in order to assess either
— the mean value of one or more of its characteristics, or
— 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.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 characteristic
physical, mechanical, dimensional, chemical, biological, botanical or organoleptic property of tobacco EXAMPLE Leaf position, colour, ripeness, leaf length.
3.2 batch
definite quantity of tobacco that is produced under conditions that are presumed to be uniform with respect to one or more of its characteristics (3.1)
Note 1 to entry: This notion implies generally that the batch consists of tobaccos of the same origin belonging to the same variety.
3.3 consignment
quantity of tobacco delivered at one time
Note 1 to entry: The consignment may consist of one or more batches (3.2) or parts of batches.
3.4 sampling unit
unit part of the consignment (3.3)
Note 1 to entry: It is separately packaged (bale, wooden or cardboard case, basket or sack).
Note 2 to entry: For bulk tobacco, a consignment with a total mass of m kg should be considered to be composed of m/100 sampling units.
Note 3 to entry: The definition of the term “sampling unit” as given in this document is a special case of the general definition given in ISO 3534-2, and it applies only to raw tobacco.
3.5 stratified sampling
sampling carried out in such a way that specified proportions of the sample are drawn from different strata for a population that can be divided into different subpopulations called strata