The purpose of this standard is to describe a procedure for taking samples of liquid and solid additives for concrete, mortars and pastes defined in the UNE 83-200 standard, which must be used to determine their characteristics through operating procedures. described in the corresponding UNE standards. NOTE- Sampling of the additive, unless agreed between the buyer and seller, will be carried out by the buyer upon receipt of the additive; The person designated by the corresponding factory or by the additive supplier will have the right to witness it, except in the case that the operation is carried out by personnel designated by the laboratory that, by mutual agreement between seller and buyer, will carry out the corresponding tests. .