Globe Scientific Oil Centrifuge Tubes facilitate testing of petroleum products for water and sediment. Available in both 6-inch “Short Cone” and 8-inch versions, these tubes match most equipment and test protocols. Premium 3.3 Borosilicate glass material insures strength, durability, and chemical resistance. 3.3 Borosilicate Glass Construction Graduated to 100mL in specifi ed increments Blue Enamel Graduations White printed marking spot Re-usable Autoclavable