7002 2090 10

7002209010

Cylindrical shaped glass preforms of high-purity silica glass (quartz): -with an optical core made of germanium-doped silica glass (quartz), intended for the production of low-loss optical fiber: -with a length of not more than 2500 mm, -with a diameter of 115 mm or more but not more than 139 mm,  -on one side with a conical end  -on the other side with a handle with a diameter of 25,4 mm, coated at the end with aluminium oxide