Caliper is an indirect measure of the compression stacking of corrugated boxes. Low caliper usually results in corrugated box performance below specifications. Caliper is maximized by (1) proper flute formation and bonding, and (2) minimizing crush after formation. The intent of this Technical Information Paper will be to discuss the benefits of SPC techniques and the application of these techniques to finishing machine crush. Discussion on box plant quality measurement TAPPI TIP 0304-02 Box Plant Quality Measurement: Why Test and corrugated box plant quality targets TAPPI TIP 0304-03 Corrugated Box Plant Quality Targets review questions and answers regarding quality and testing. TAPPI TIP 0304-04 Corrugated Caliper: Why Is It So Important details the importance of corrugated caliper in corrugated container construction.