The screw caps feature continuous 1½-turn threads that assist in securing the cap while keeping it easy to open and close. A molded- in sealing ring envelops the tube wall to prevent liquid bypass and provides a positive stop for the cap. Quality control protocols include gravity and vacuum chamber testing to ensure that the seal integrity is maintained. Not autoclavable.

• The coloring agents added to plastics can carry unwanted trace metals. By not adding these colorants we remove any potential trace elements they may contain
• Temperature limits are brittleness temperatures of the combined tube and cap materials.
• Item Packaging: 500 per case