美利体育登录入口官网:BS EN ISO 23856:2021 压力和非压力供水、排水或污水处理用塑料管道系统 基于不饱和聚酯(UP)树脂的玻璃增强热固性塑料(GRP)系统
Plastics piping systems for pressure and non-pressure water supply, drainage or sewerage. Glass-reinforced thermosetting plastics (GRP) systems based on unsaturated polyester (UP) resin