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About product and suppliers:
        Alibaba.com offers 12,928 si standard products. About 1% of these are windows, 1% are steel pipes. 

A wide variety of si standard options are available to you, such as 10#, 20#, and a53(a,b). You can also choose from free samples, paid samples. 

There are 12,928 si standard suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of si standard respectively. 

Si standard products are most popular in North America, Mid East, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 3,369 with ISO9001, 1,162 with Other, and 632 with ISO14001 certification.