Lubricants and Seals without Grease or Adhesives. Pure, non-sintered Teflon® PTFE Lab-Thread Tape contains no adhesive, yet does a superior job of sealing small apertures. Conforming to irregulari-ties of surfaces, threads and joints of all types, Lab-Thread Tape eliminates the need for lubricants and vacuum greases. Teflon® Lab-Thread Tape can be used on ground glass joints, desiccators, bell jars, freeze-drying equipment, etc. A wrap of Lab-Thread tape provides a vacuum tight seal which will release even after long periods. “Freezing” is totally eliminated. 12.7mm (1/2″”) wide x 7.6 meters (300″”) roll. 3 per bag.