This is in contrast to seals with controlled depth scoring, in which the residual metal remains in the score. A proper seal is achieved when the metal is rolled under the radius of the glass and does not contact the neck of the vial. The scissor score will open slightly when the seals are capped on the vials at the recommended pressure of 25 to 30 pounds. The slight separation is by design and does not affect seal integrity. To achieve a proper seal, West recommends applying seals with top pressure of 25 to 30 pounds.
Unacceptable seals are the result of excessive top pressure.
The opening in the scissor score becomes evident and too much metal is rolled under the vial flange.