D4032-08 – Standard Test Method Technical Guide

The ASTM D4032-08 (Reapproved 2016) standard specifies the method for determining the stiffness of fabrics using the circular bend procedure. It is generally applicable to woven, knitted, and nonwoven textiles of any fiber content. The test principle involves a plunger forcing a flat, folded specimen through an orifice; the maximum force required directly measures the fabric’s resistance to bending.

📐 Apparatus and Standard Dimensions

The Circular Bend Stiffness Tester utilizes a smooth-polished, chrome-plated steel platform measuring 102 × 102 × 6 mm (4 by 4 by 1/4 in.). The critical orifice