Borosilicate Capillary Glass Tubes
Precision unworked borosilicate glass tubes with very small inner diameters for medical and analytical capillary applications. Falls under HTS 7002.39.00 as other unworked tubes, before any sealing or calibration. Used in blood analyzers, chromatography, and micro-fluidics.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If constricted or sealed at ends
Capillary tubes with tooled ends for specific lab use are drawn or blown products.
If for laboratory or pharmaceutical use when finished
Completed capillary assemblies become lab/pharma glass articles.
If made into glass ampoules
Sealed capillary-style tubes for pharmaceuticals classify as bottles and ampoules.
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Import Tips & Compliance
• Specify bore diameter in import docs; very thin walls must still qualify as unworked per chapter annealing note
• Obtain biocompatibility certifications for medical end-use to facilitate FDA clearance alongside customs
• Avoid bundling with plastic holders, as sets may classify under 7017 medical glassware
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