The Digital Stiffness Tester is designed to determine the stiffness and compression strength characteristics of paper and paperboard. The compressive index of a material (failure load per unit width/basis weight) increases with sheet density in a manner similar to the tensile index. Therefore, fibre characteristics that influence sheet density, flexural modulus, and fibre resilience significantly affect stiffness performance.

This instrument is fully microprocessor-controlled with user-friendly, menu-driven software that allows easy selection and setting of test parameters. It features a precise pneumatic clamping system to securely hold the specimen, minimizing human error and ensuring consistent and reliable test results.

The tester enables rapid and efficient determination of compression strength for fluting media and test liners. It is suitable for paper and paperboard with a GSM range of 100–400 and comes equipped with an in-built printer for easy documentation of test results.

Ideal for paper mills, packaging industries, and quality control laboratories.