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About product and suppliers:
        Alibaba.com offers 45,394 so grade products. About 5% of these are hair extension, 1% are sulphate, and 1% are carbonate. 

A wide variety of so grade options are available to you, such as free samples, paid samples. 

There are 45,394 so grade suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of so grade respectively. 

So grade products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 10,751 with ISO9001, 10,163 with Other, and 1,790 with ISO14001 certification.