1 Pound – 4mm Borosilicate Glass Tubing – 12 inches in length.

(Buy 2 pounds or more and get a GREAT discounted price!)

Glass tubing is most often used in laboratories but is also very popular for creating homemade Hummingbird feeders. This tubing is of a low expansion borosilicate composition with high chemical resistance, making it the most popular type of glass in the world for laboratory use. It meets all U.S. Pharmacopoeia specifications for type 1A glass. Borosilicate glass is simply the generic form of the better known heat resistant glass brands Pyrex, Corning, Simax, Kimax and others.

This is standard wall, borosilicate, 12 inch glass tubing. All tube lengths are approximate.
One Pound contains approximately 83 tubes.
Total variance OD – 0.3mm
Wall Thickness – 0.8mm
Total Variance Wall Thickness – 0.1

In order to be bent, the tubing has to be heated until it glows a faint red color. Heating should be with a propane or natural gas burner similar to a plumbing torch or our propane Bunsen burner. Propane can be purchased at a local hardware store. Specifications for all sizes of tubing are listed below.

Physical Properties:

Thermal Expansion x107 cm 32.5
Strain Point 510C
Softening Point 820C
Annealing Point 560C
Density 2.23