BS ISO 21138-3. Plastics piping systems for non-pressure underground drainage and sewerage. Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE). Part 3. Pipes and fittings with non-smooth external surface, Type B— 55 стр.
BS ISO 21138-2. Plastics piping systems for non-pressure underground drainage and sewerage. Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE). Part 2. Pipes and fittings with smooth external surface, Type A— 57 стр.
BS ISO 3129. Wood. Sampling methods and general requirements for physical and mechanical testing of small clear wood specimens. Complementary element— 15 стр.