Glass Science Lab Test Tubes

Glass test tubes for science, kitchenware, crafts, gifts, wedding decorations or product display. Our tubes are thick-walled borosilicate glass that are food safe. All come with round bottoms and are machine washable. Thick reinforced rims & optional tall tapered corks ensure airtight stoppering or make convenient hanging plant propagation stations. Indigo test tubes are completely blank top to bottom for custom branding.

Ready to buy? Just click on any of the choices listed below. Options include tubes only where you can purchase just one of any size as few replacements or for prototyping. All boxes & cases whether with or without stoppers come wholesale priced with 50% off.

Stil not convinced? Click on Description to find out more.

Science Lab Glassware-Test Tubes

Glass test tubes, like graduated cylinders, Erlenmeyer & volumetric flasks, are common pieces of biology and chemistry laboratory testing equipment. Our lab quality test tubes are made with borosilicate glass, ideal for its resistance to high temperature & chemical inertness.

Applications range from growing tissue and bacterial cultures to root cuttings, measuring pH or observing chemical reactions. They come as small, medium or large capacity tubes suitable for mixing, heating or even product packaging and display. All Indigo glass test tubes come with beaded rims for spill-free pouring and repeated safe stoppering. Our larger thick-walled 25, 32 & 38 tubes will tolerate prolonged boiling.

What Our Customers Say on Google

(Genuine Reviews, not AI Generated or Worse)

Amber T.: Friendly staff with great communication... They worked to get my shipment to me as soon as possible which I appreciated. The product seems to be high quality and the price point is better than anywhere else I looked....

Kerri K: I had been looking for just the right size test tubes for my propagation wall and had failed several times. ..Perfect size! Great quality and arrived quickly with no damage. Thank you for good customer service in a world that has forgotten what that is all about.

Chad L: Bought a case of the biggest test tubes we could find for a massive propagation station for our plants. Couldn't be happier. Shipped quickly, well protected and high quality product!

Pete G: Great quality test tubes at a fair price! Needed a bunch of these for my handmade propagation stations that I sell online/at markets and they came within a week and in perfect condition.

Holly C: Ordered 15 test tubes. Very well packaged, quick delivery times, high quality test tubes that feel great. Thanks for the great service!

Anna H: I was pleased with the response that I got at Indigo Instruments - very helpful, very courteous and polite. I really appreciated the way you handled my very small purchase...

Lindsay McL: Great service! I forgot to order the corks with my tubes and they had them shipped out that day and arrived at my door within 4 days! ...found them before the Christmas Season arrives ...adorable Reindeer hot chocolate gifts. Thank you!

Barbara C. We have been purchasing glass test tubes from Indigo Instruments for many years....always arrive in perfect condition... they have a broader selection then other companies and prices are very competitive.

Lab grade glass test tubes at disposable prices? Absolutely.

Thick walled borosilicate glass-dishwasher safe & autoclaveable
Thick beaded rim for safe, repeated stoppering
Round bottomed, completely blank, brandable with decals
Buy just one if that's all you need: prices start at $0.24
Buy a box or case & save 50%
Tall tapered cork or rubber stoppers for tight fits.

Description More Information Technical Instructions/Safety

More Information

Test Tube Wall Thickness

Being made of borosilicate glass is not a guarantee of quality of itself. Uniform test tube wall thickness is essential for safety, durability & repeated use, maximum heat transfer and chemical resistance. The average wall thickness of Indigo Instruments borosilicate glass test tubes are listed below for outside diameters (OD) of our tubes. Borosilicate glass culture tubes on the other hand are made with thin walls in order to be inexpensive & should be considered disposable test tubes.

13mm	18mm	25mm	32mm	38mm
1.04	1.32	1.4	1.48	1.73

Note (1): We do not carry graduated test tubes with beaded rims; the closest thing we have to offer are graduated cylinders.
Note (2): We cannot guarantee our test tubes will fit your test tube rack. If this could be an issue, contact us first.

Indigo Instruments Tapered Cork Heights

Besides wall thickness, our test tubes have reinforced rims for repeated safe stoppering. Our cork stoppers are produced in Portugal using sustainable growth practices. They are a truly natural product with excellent mechanical properties (see blog below in More Info). More importantly, these stoppers are produced according to the highest cleanliness standards backed by this certificate of cleanliness & cleaning procedures.

Cork Stopper Test Tube Fitting

The top row in the table below lists the nominal outside diameter of our test tubes. The bottom row is the average height of the tapered cork stoppers that fit them. There is some variance in test tube internal diameter to allow for corks to fit anywhere from 1/3 to 2/3 of their height. Since cork is compressible across its diameter, these thicknesses help ensure airtight seals no matter what the ID variance is.

13mm	18mm	25mm	32mm	38mm
17.5mm (0.69")	22mm (0.87")	32mm (1.25")	32mm (1.25")	38mm (1.5")

Glass Test Tube Applications

Indigo test tubes meet all the necessary specifications for use in chemistry labs. Specifically, resistance to most chemicals and thermal shock. This also makes them particularly useful in product packaging & display. Here are just a few of the uses our customers have found for our tubes. Not shown are bath salts, candy sprinkles, tea, cannabis, and wine. All tubes come with reinforced rims except where noted otherwise.

55903 culture tube, 13 mm x 100 mm (1/2x4") 8 mL, unrimmed
55903R test tube, 13 mm x 100 mm (1/2x4") 8 mL
55907R test tube, 18 mm x 150 mm (3/4x6"), 30 mL: Shot glasses; Floral centerpiece root cuttings
55908R test tube, 25 mm x 100 mm (1x4"), 30 mL: Gourmet food samplers, Flower vases, Branding
55909R test tube, 25 mm x 150 mm (1x6"), 50 mL: Branding, Coffee, Plant propagation , Spice rack
55910R test tube, 25 mm x 200 mm (1x8"), 75 ml: Flower vase, Chandelier
55911R test tube, 32 mm x 200 mm (1.25 x 8"), 125 mL: Museum art, Spice rack
55912R test tube, 38 mm x 200 mm (1.5x8"), 165 mL: Concrete planter insert

Test Tubes Blogs

Technical

Borosilicate Glass Physical Properties

Borosilicate glass, sometimes referred to as "pyrex" is standard in lab glassware. It's resistant to thermal shock and is food safe because it is completely LEAD FREE compared to glass used in cut crystal, etc.!

See the tables below for physical characteristics. The first row lists the coefficient of linear thermal which is the best indicator for resistance to thermal shock . It is roughly1/3 of soda lime glass, the type most commonly used in food & drink.

Borosilicate Glass Properties - Physical Data
Physical Performance	Numerical Value	Unit
Coefficient of mean linear expansion (20°C; 300°C)	3.3 ± 0.1	10^-6K^-1
Transformation Temperature	525 ± 15	°C
Softening Point	820 ± 10	°C
Working Point	1260 ±20	°C
Density at 20°C	2.23 ± 0.02	g/cm³
Mean Thermal Conductivity (20°C-100°C)	1.2	w/rn²k
Refractive Index	0.92	1

Instructions/Safety

No Glassware Returns

If you are unsure what glassware is best for your needs please contact us before ordering.

Glassware cannot be returned for any reason; this is for your safety and ours. It would be prohibitively expensive to test for bacteriological, chemical or radiological agents since there is no way to tell if glass has been contaminated just by looking at it. We would have to throw it away even if you claim to never have opened the package.

However, if the item is broken or clearly defective such as severely or chipped upon arrival, send us an image & we will refund you.

Safety Disclaimer-Warning

Handle glassware with care & personal protective equipment (PPE) - goggles & gloves because:

Unless you poured it yourself, assume any liquid is hazardous.
Hot & cold glass looks the same & does not have to be red to cause burns. Unless it was in the freezer, assume it is hot.
Borosilicate glass will withstand a fair degree of thermal shock but unless your intent is to see if you can make it crack, don't toss recently heated glass into a cold water bath.
When borosilicate glass breaks, it makes sharp edges like any other kind of glass. Dispose of pieces carefully.
See blog: Glass Test Tubes with Cork-Chemistry Kitchenware which includes a video on how to safely stopper test tubes.

Glass Science Lab Test Tubes

Lab Grade Glass Test Tubes

Science Lab Glassware-Test Tubes

What Our Customers Say on Google

Lab grade glass test tubes at disposable prices? Absolutely.

13x100mm Culture Tubes

13x100mm Plain Rimmed Glass Test Tubes

100 13x100mm Test Tubes+Tapered Rubber Bungs

Chemistry Science Lab Test Tubes 18x150mm

100 Chemistry Lab Test Tubes+Tapered Corks

Test Tube Flower Vases 25x100mm (1x4")

100 25x100mm Test Tubes + Tapered Corks

100 25x100mm Tubes + Rubber Stoppers

25 x 150mm Glass Test Tubes (1x6")

Wholesale Bulk Test Tubes-Cork Tops

100 25x150mm Tubes, Stoppers

Bulk 25mm Glass Test Tubes (1x8")

Bulk Big Test Tubes Wholesale Combo

100 25x200mm Tubes, Stoppers

Large Test Tubes 32x200mm/1.25x8"

Large Glass Test Tubes With Cork-Bulk

50 32x200mm Tubes, Stoppers

Jumbo Glass Test Tubes 38x200mm

Jumbo Glass Tubes+Cork Wholesale