What is Overpress Glass Defect?

What is Overpress Glass Defect?

By: Berlin Packaging Specialist
Date: November 11, 2019

Overpress is a type of glass defect during the manufacturing process of glass bottles.

A finish which has excessive glass projecting upward from the inside edge of the finish. This is a critical defect in all types of finish.

Fragile (C) Not fragile (M+)


  • Defective closure, risk of leaks, product deterioration (M+)
  • Breakage of the overpress with risk of contamination (C)