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About product and suppliers:
        Alibaba.com offers 33,498 national standard products. About 1% of these are windows, 1% are women's jackets & coats, and 1% are men's t-shirts. 

A wide variety of national standard options are available to you, such as q195, 20#, and q235. You can also choose from astm, bs, and gb. As well as from erw, cold rolled. And whether national standard is swing, or sliding. 

There are 33,216 national standard suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Philippines, and Hong Kong, which supply 99%, 1%, and 1% of national standard respectively. 

National standard products are most popular in Domestic Market, Southeast Asia, and North America. 

You can ensure product safety by selecting from certified suppliers, including 16,055 with ISO9001, 6,820 with ISO14001, and 5,964 with Other certification.