Heat resistant high borosilicate 21mm glass test tubes
Well annealed, chemically stable and resistant to thermal stress
Clear and transparent walls ensure optimal visibility
Cork stopper provides secure sealing mechanism
Natural corks and synthetic corks are optional
Flat-bottommed test tubes predominate, round bottom also available
MOQ 300pcs available while MOQ for custom size is 1,000pcs

Meet ASTM E982 specification, Type II requirements

21mm Flat Bottom Glass Test Tube with Cork

$0.10

Usually is 0.9-1.2mm according to different sizes while 1.5mm thickened wall test tubes are available to customize with MOQ 10,000pcs.
To ensure the safe transportation of glass test tubes, we employ a robust packaging system comprising individual PE bubble bag, shrink wrap, foam boards, and cardboard boxes. This multi-layered approach provides excellent protection against potential damage during transit. Our test tubes are uniform bottoms, fire-polished rims, consistent lengths, and convenient packaged in shrink-wrapped inner box. The shrink wrap prevents any external elements or moisture from affecting the test tubes. The foam boards act as shock absorbers, minimizing the risk of breakage by evenly distributing the weight and preventing collisions between the tubes. Finally, the sturdy cardboard boxes offer an additional layer of security during handling and transportation. Individual PE bubble bag and custom partition carton are optional for additional protective packaging measures.
Textile testing
Tissue culture
Test tubes for centrifugation
Cultivation of cells or microorganisms on solution or agar slants
Scientific experiments, laboratory tests, photometry or chemical reactions
Storing samples
Specimen collection
Packaging for cigar
Packaging for bath salts
Packaging for herbal tea
Packaging for vanilla beans
Packaging for coffee beans
Packaging for hot chocolate
Packaging for candy, dry foods
Packaging for wine or ingredients
Packaging for herb & spice powders
Test tube as vase for botanical display
For classroom teaching and demonstration purposes

21mm Flat Bottom Glass Test Tube with Cork

Thickness

Package

Applications

After-sales Services