请记住，现在只要威固等8家生产商经过了世界窗膜协会(IWFA)的认证。

Please remember, now as long as V-KOOL and other 8 manufacturers by the window Association (IWFA) certification.

youdao

山东蓝景膜技术工程有限公司是中国膜工业协会常务理事单位，是渗透汽化膜技术领域的领军企业。

Megavision membrane technology and Engineering Co., Ltd. is executive director unit of China membrane Industry Association and now it is the leader in field of pervaporation membrane technology.

youdao

山东蓝景膜技术工程有限公司是中国膜工业协会常务理事单位，是渗透汽化膜技术领域的领军企业。

Megavision membrane technology and Engineering Co., Ltd. is executive director unit of China membrane Industry Association and now it is the leader in field of pervaporation membrane technology.

youdao