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Test
Tube Brushes
Test Tube Racks |
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| *"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 chemical changes
can be seen at a greater distance. 
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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
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......................$19.95
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......................$19.95
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.............$19.95
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.............$24.95
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.............$31.95
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, Brass, Stoddard type, 5", with finger grip. Works with 12 mm and larger test tubes.
#C73.......$1.49 ea.
Test tube clamp, Brass, Semi-Micro - made for extra-small test tubes (e.g., 10x75, 12x75).
#C35.........$1.25 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.........$0.89 ea.
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