Discussion on Establishment of Ash Content Index in PVC-U Pipe Standards
The determination method of ash content index of unplasticized poly(vinyl chloride)(PVC-U)pipes and its application in product standards were studied.The results show that under the same burning conditions,the weight loss rates of inorganic fillers used in different types of PVC-U pipes vary.The filling material dosage and mechanical property changes of PVC-U pipes cannot be derived solely based on ash content.The use of ash content index as a substitute indicator lacks reliability,and the setting of ash content limit values cannot improve product quality,which interferes with product quality control.Moreover,the existing mechanical property indicators in GB/T 5836.1-2018"Unplasticized poly(vinyl chloride)(PVC-U)pipes for soil and waste discharge inside buildings"can meet the performance requirements of PVC-U pipes as a direct property indicator,and there is no need to increase the ash content index.
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