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About product and suppliers:
        Alibaba.com offers 4,257 blue slate products. About 10% of these are slate, 4% are roof tiles, and 1% are dishes & plates. 

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

There are 4,257 blue slate suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of blue slate respectively. 

Blue slate products are most popular in North America, Western Europe, and Mid East. 

You can ensure product safety by selecting from certified suppliers, including 697 with ISO9001, 193 with Other, and 48 with ISO14001 certification.