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About product and suppliers:
        Alibaba.com offers 675,351 glass tube products. About 1% of these are quartz tubes, 1% are glass, and 1% are test tube. 

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 u-bent. As well as from polished, grinded, and gold coated. And whether glass tube is ozone free, or high ozone. 

There are 675,157 glass tube suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 99%, 1%, and 1% 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 108,485 with ISO9001, 59,561 with Other, and 12,235 with ISO13485 certification.