Complies with ASTM Specification E438 for Type I, Class B glass requirements. Pipettes are uniquely designed to receive and prevent a cotton plug from slipping into the body of the pipette while maintaining proper wall weight to strengthen the pipette and prevent accidental breakage at the top end. Cotton plugs are not supplied. Tips are held to close diameter tolerances and ends are square cut. Designed from ASTM Specification E732, Type I and II requirements.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.