This section of BS 6920 describes the preparation of test samples of all types of non-metallic (including cementitious) materials and products, including water fittings and components, pipes and materials used in coating, protection, lining, jointing, sealing and lubrication, for their suitability for use in contact with water intended for human consumption, with regard to their effect on the quality of the water. This standard does not cover metallic materials and products, unless they will be used in conjunction with a non-metallic material, e.g. coating. NOTE Under the relevant National Regulations [1] to [7] , the National Regulator may specify additional provisions in some cases and will assess the significance of the results obtained.