Article 3 4.

Shipments of waste explicitly destined for laboratory analysis to assess either its physical or chemical characteristics or to determine its suitability for recovery or disposal operations shall not be subject to the procedure of prior written notification and consent as described in paragraph 1. Instead, the procedural requirements of Article 18 shall apply. The amount of such waste exempted when explicitly destined for laboratory analysis shall be determined by the minimum quantity reasonably needed to adequately perform the analysis in each particular case, and shall not exceed 25 kg.