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About product and suppliers:
        Alibaba.com offers 8,977 4.5u products. such as free samples, paid samples. 

There are 8,982 4.5u suppliers, mainly located in Asia. The top supplying countries are China (Mainland), United States, and United Arab Emirates, which supply 91%, 4%, and 1% of 4.5u respectively. 

.5u products are most popular in Southeast Asia, Domestic Market, and Mid East. 

You can ensure product safety by selecting from certified suppliers, including 3,145 with ISO9001, 613 with Other, and 605 with ISO14001 certification.