DB21/T 2170.2-2013
采暖塑料管管道工程技术规程 第2部分：无规共聚聚丙烯（PP-R）塑铝稳态复合管管道、纳米复合四型 聚丙烯（NFβPP-R）管管道、无规共聚聚丙烯（PP-R）管管道、聚丁烯（PB）管管道
Heating Plastic Pipe Engineering Technical Regulations Part 2: Random Copolymerized Polypropylene (PP-R) Plastic-aluminum Stable Composite Pipe, Nanocomposite Type 4 Polypropylene (NFβPP-R) Pipe, Random Copolymerized Polypropylene (PP -R) pipe piping, pol