These versatile borosilicate rods are compatible with Pyrex. Northstar
colors may be layered, striped, swirled, combed, hobnailed, encased, blown,
etc. Many of these colors "strike" to another color when reheated.
Coefficient of Expansion is 33 x 10-7° C. Rod length is approximately
20", rod diameter is approximately 1/4", rod weight is approximately
1.33 oz., softening point is 1510° F., and the annealing point is
approximately 1040° F. Northstar is sold by the pound. Must buy entire
rod.