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About product and suppliers:
        Alibaba.com offers 670,760 glass tube products. About 1% of these are quartz tubes, 1% are test tube, and 1% are glass. 

A wide variety of glass tube options are available to you, such as clear quartz pipe, tempered glass, and opaque quartz pipe. You can also choose from one end closed quartz tube, c shape, and twin tube. As well as from polished, grinded. And whether glass tube is ozone free, or high ozone. 

There are 670,760 glass tube suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of glass tube respectively. 

Glass tube products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 111,585 with ISO9001, 62,395 with Other, and 12,409 with ISO13485 certification.