The exhaust fan series of closed zipper, shells are of high quality with high-strength ABS plastic manufacturing, the color is bright, of high corrosion resistance ability;
封闭拉帘式排气扇系列面板都是用优质的工程塑料ABS制造， 色泽光亮， 抗腐能力强；
They also show that water absorption could availably evaluate the waterproof ability and resistance to acid and alkali corrosion of concrete protective coatings.
研究还表明吸水率可以有效评价混凝土保护涂层的防水能力和抵抗酸、碱侵蚀的能力。
Features: the overall stability and flexibility of the product is good, good corrosion resistance, strong anti erosion ability, with water permeability, low cost of construction and so on.
特点：产品整体稳定性和柔性良好，防腐蚀性良好，抗冲刷能力强，具有透水性、施工方便造价低等特点。
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