硬质聚氯乙烯管又称硬质塑料管,在电气施工图中常用 VG 表示。硬塑料管应用于我国建筑电气安装工程中约有二十多年的历史。由于塑料制品的日益发展,硬质塑料管在电气施工中一般能代替电线管、黑铁管和镀锌铁管等金属管,节省了大量的钢材。硬塑料管具有耐腐蚀,绝缘性能好,施工中操作工艺简便等优点。但它的质地较脆,容易破碎,在高温下容易变形,故硬塑 Hard PVC pipes, also called rigid plastic pipes, are commonly used in electrical construction drawings. Hard plastic tubes have been used in our country’s electrical installation engineering for about twenty years. Due to the increasing development of plastic products, hard plastic tubes can generally replace metal tubes such as wire tubes, black iron tubes, and galvanized iron tubes in electrical construction, saving a lot of steel. Hard plastic pipe has the advantages of corrosion resistance, good insulation performance, and easy operation in construction. But its texture is relatively brittle, easily broken, easily deformed at high temperatures, so hard plastic