Phenol, o-cresol, m-cresol, p-cresol; cresylic acid and xylenols for industrial use — Methods of test — Part 5: Visual test for impurities insoluble in water (Phenol only)
Plastics rainwater piping systems for above ground external use - Unplasticized poly(vinyl chloride) (PVC-U) - Part 2: Guidance for the assessment of conformity