Tubing Borosilicate Glass, 18mm, length 0.5mtr. app..-EIS-CH0747K offers a thoughtfully designed, durable resource for hands-on learning. Borosilicate glass 3.3, light wall, length of 0.5 meter approx. 18 mm, Borosilicate glass 3.3, light wall, length of 0.5 meter approx.