The main exterior framework is made with FRP materials to cut down metal resonance, increase acid-and -alkali-resistance and expend the service life (can be used for 10-20 years in a row).

• 五、主体外框采用FRP材质,可减少金属共鸣,且抗酸碱,防腐蚀,增加使用年限。(可连续使用10-20年