- Manufactured from borosilicate glass 3.3
- Provided with phenolic screw-thread caps, unattached
- Series 45066 is designed from ASTM E982, Type VI, Class A requirements (Rubber liner)
- Series 45066A is designed from ASTM E982, Type VI, Class B requirements (PTFE liner)
- The 20 x 125 mm size of these tubes is suitable for the determination of insulin according to the method of Alving, Rubin and Millor, Journal of Biological Chemistry, 127, 3 (March 1939)
- Autoclavable