   Glassware
   Stoppers
   Tubing, Glass
   Test Tube Brushes
   Test Tube Racks

*"Closed-tube tests" mean the tube is closed at only one end. "Open-tube tests" mean the tube is not closed at either end (in other words, it's just a section of glass tubing, usually bent to keep the sample from sliding out).

Larger test tubes allow the sample to contact too much air to be useful in "closed-tube" tests. A piece of glass tubing with one end fused shut can also be used in the closed-tube test. Never heat a tube that's sealed at both ends!

Please be sure to read about proper heating of test tubes.

Most popular test tube size?
They are all about equally popular. 15x125 has a slight edge over the rest.

Each size has its merits. The 25x150's are good for lecture hall demonstrations, for example; more liquid means color changes can be seen at a greater distance.

Test Tubes

We sell the style traditionally used in chemistry; these have a rim or lip.
Rimless tubes are normally called culture tubes.

Quick links:
10 x 75 mm
12 x 75 mm
13 x 100 mm
15 x 125 mm
18 x 150 mm
25 x 150 mm

10 x 75 Test Tube with Semimicro Test Tube Clamp

10 x 75 Test Tube with Semimicro Test Tube Clamp

Test tubes, 10 x 75 mm, borosilicate. Excellent for micro and semi-micro chem experiments. Can also be used for closed-tube* tests of minerals.
Please read our safety notes for proper heating of test tubes.
The semi-micro clamp (listed below) is good for these small test tubes.

#330-72. Test tube, 10 x 75 mm, 72 each......................$20.95

Test tubes, 12 x 75 mm, borosilicate. This size will fit the smaller sleeve inserts provided with the Ultra 8 series centrifuges. This is the smallest test tube diameter for which we have rubber stoppers available (takes #000 stopper, avail. in solid only). These test tubes will fit in our #C1318 and #C1331 racks.

#331-72. Test tube, 12 x 75 mm, 72 each......................$22.95

The 12x75 tubes will fit the smaller sleeves provided with the Ultra 8V.

Test tubes, 13 x 100 mm, borosilicate. This is the size that was in many of the old chemistry sets (Skil-Craft, etc.). Takes #000 stopper (avail. in solid only).
These tubes fit in our #C1518 racks.

#332-72. Test tube, 13 x 100 mm, 72 each.............$23.95

Test tubes, 15 x 125 mm, borosilicate. This is the smallest test tube size for which we have 1-hole stoppers available (size #00 stopper).
These tubes fit our #C1518 racks.

#333-72. Test tube, 15 x 125 mm, box of 72.............$26.95

Individual test tubes... when we have an open carton.
#33372-EA. Test tube, 15x125 mm, by the piece.........50 cents ea.

Test tubes, 18 x 150 mm, borosilicate glass. Indispensable for all-around lab work. This is the smallest test tube size for which we have both 1-hole and 2-hole stoppers available (size #1 stopper).

The 18 x 150 has been the standard size laboratory test tube for many years, although some modern labs are using smaller tubes to conserve reagents and generate less waste.
Inside Diameter: between 15.5 and 16.5 mm.
Capacity (max.) about 25 mL

#334-72. Test tube, 18 x 150 mm, box of 72.............$32.95

Test tubes, 25 x 150 mm, borosilicate glass. The largest size of test tube we carry (this is about 1 inch diameter by 6 inches long). Takes #4 stopper. Capacity: (maximum) about 50 mL.
Sold by the dozen.

#336-06. Test tube, 25 x 150, 1 dozen ea..............$14.99

Test tube clamp, Stoddard type, with finger grip. May be brass or nickel steel. Works with 12 mm and larger test tubes.
#C73.......$1.70 ea.

Test tube clamp, Brass, Semi-Micro - made for extra-small test tubes (e.g., 10x75, 12x75).
#C35.........$1.39 ea.

Test tube clamp, Wooden - resembles a clothespin but is made specially for holding a test tube during heating. Economical. Doesn't conduct heat to the hand (but will of course char if directly exposed to flame). Works with 12 mm and larger test tubes.
#C70.........Temp. unavailable. We stopped carrying these since the quality went way downhill. We are trying to get decent ones again.

Test Tube Brushes

Test Tube Racks

through Google Checkout

We also accept
Paypal

Glassware

Glass Tubing

Stoppers

Test Tube Racks
Main page

Terms of Sale / Terms of Use

Copyright Notice