Tubing, Glass, Borosilicate - 4, 5, 6, and 7 tube diameters available. Borosilicate glass is superior to ordinary flint glass in both heat and corrosion resistance. It can be softened for heat-bending in a propane or Bunsen burner flame.
The 4 mm dia. glass tubing is for the smallest pre-bored stoppers (such as #00). It is also useful if you've bored your own #000 stoppers. The 4 mm is good for micro "closed-tube" tests (seal 4 to 5-cm sections at one end in the burner flame to make these tubes*); borosilicate glass doesn't melt and "cave in" on the sample as readily as ordinary soda-lime or flint glass.
The 5 mm glass tubing is the most popular size and will fit the common sizes of pre-bored stoppers (#1 through #6).
4, 5, 6, and 7 mm tubing comes in bundles of 12 pcs. each. The length of each piece is approximately 24 inches (60 cm).
Borosilicate, 4 mm diameter x approx. 60 cm (2 feet) long. #C2423.........$12.95 / doz.
Outside Diameter ca. 4.0 mm
Wall thickness ca. 0.85 mm
Ship wt. approx. 1 lb.
Borosilicate, 5 mm diameter x approx. 60 cm (2 feet) long.
#C2424-DZ..........$14.95 / doz.
5 mm is the popular size that fits most common 1- and 2-hole stoppers.
IMPORTANT note about the 5mm tubing:
The current batch we have varies between ca. 4.6 and 5.2 mm. Wall thickness is typically 1.1 to 1.2 mm. This is general chemistry tubing; it is not suitable for precise engineering applications. A bundle of tubing will contain whatever size deviation is in the batch.
Borosilicate, 6 mm diameter x approx. 60 cm (2 feet) long.
#C2425.........$16.95 / doz.
Outside Diameter ca. 6.0 mm
Wall Thickness ca. 1.0 mm
6 mm tubing is a little too big for the common sizes of pre-bored stoppers we have in stock, although some customers prefer it when a tighter fit is required in the stopper holes (wear heavy gloves and safety goggles when pushing tubing through a stopper hole; use soapy water to reduce the friction).
Ship wt. approx. 1 lb.
Borosilicate, 7 mm diameter x ca. 60 cm (2 feet) long
#C2426..........$18.95 / doz
Outside dia. ca. 7.0 mm
Wall thickness ca. 1.0 mm
7 mm and up will not fit in the standard bored holes of most stoppers. You must enlarge the stopper holes by hand with the aid of a cork borer or a drill.
Larger Sizes of tubing are available in Flint Glass.
Best for smaller sizes of glass tubing (< 8 mm O.D.) Press device jaws together against tubing; rotate cutter around tube while squeezing with moderate pressure. Don't crush it into the glass-- press only enough so the wheel can scratch the surface. A deep scratch is obtained gradually by repeatedly turning the cutter / tube. Wear safety goggles and gloves.
A few rotations and the tubing should be scored enough to give a neat, clean break (wrap tubing in a cloth before snapping).
Score-and-snap method works well for small dia. tubing but is not recommended for large dia. (10+ mm).
Ship. wt. 1/2 lb.
#C2400. Glass tube cutter..............$11.99
* Never heat a tube that's been sealed at both ends; it could explode and send glass fragments everywhere. There must always be some vent for expanding gases to escape.
Tubing, Crown / Flint Glass
Important: Wear eye protection while working with glass tubing. Keep bystanders away. To lessen the danger of painful accidents, wear heavy canvas or leather gloves while heat-bending glass tubing or trying to insert it through a stopper.
Small items (e.g., tubing cutters, stoppers) usually ship in the same box with the glass tubing.
Larger items (e.g., filter flasks) usually must ship in a separate box, unless we use an oversize package.
Multiple boxes or oversize packages can incur additional shipping charges that are not listed in your shopping cart. (If you order $50 or more of merchandise, we'll absorb the extra shipping cost)