Glass test tubes with screw caps are autoclavable. A white marking spot provides an excellent surface for writing. Caps have a cemented-in, white rubber liner.
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Borosilicate glass tubes and specially formulated caps are autoclavable. Caps are fabricated from a special formula resistant to the effects of temperature and steam in autoclaving. White marking spot provides an excellent surface for pencil notations. Caps have a cemented-in, white rubber liner. 20 x 150 mm tubes have a capacity of approximately 30.0 mL.