ISO 4874:2020 Tobacco — Sampling of batches of raw material — General principles.
4 Contractual arrangements
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.)
It is important that the laboratory receive a representative sample which has not been damaged or changed during transport or storage.
If it is necessary to sample tobacco taken from cigarettes, the procedures listed in ISO 8243:2013, 4.1.3 should be used.
5.2 Sampling equipment
The equipment that is used for sampling the tobacco shall be appropriate for the determination of the characteristics that are specified in Clause 4 c). If physical characteristics such as leaf dimensions or particle size distribution are to be determined, then the sampling equipment shall not alter these characteristics. The sampling equipment shall be clean and dry, and shall not affect any subsequent determination.
5.3 Containers for samples and storage precautions
The containers used for collecting the samples shall be made of a chemically inert material. They shall be airtight and preferably opaque.
The samples shall he kept in a dry and cool place protected against light, and in an odour-free environment to prevent contamination, microbial growth, infestation or other situations which would affect organoleptic properties.ISO 4874 pdf download.