Understanding the Erichsen Cupping Test: A Key Quality Check for Galvanized and Pre-Painted Steel

At Shandong Jinxinda New Materials Co., Ltd., quality control is at the core of our manufacturing process. One of the most critical tests we conduct on galvanized steel and pre-painted steel coils is the Erichsen cupping test, also known as the steel cupping test.

The Erichsen cupping test is an industry-standard method to evaluate the paint adhesion, ductility, and formability of coated metal sheets. During this process, a hemispherical punch presses into the surface of the steel until the coating cracks or detaches. The depth at which this occurs is measured in millimeters, providing a clear indication of the material’s performance under stress.

Why is this test important?

• ✅ Ensures coating durability and resistance to peeling or cracking

• ✅ Verifies mechanical performance of steel under deformation

• ✅ Confirms the quality of galvanized or color-coated steel before delivery

• ✅ Enhances end-user trust through standardized steel quality testing

At Jinxinda, every batch of our galvanized steel coils and PPGI/PPGL coils undergoes rigorous inspection, including the Erichsen cupping test, to meet international standards and exceed customer expectations. This ensures that our steel products are not only corrosion-resistant but also maintain excellent formability and surface finish during downstream processing.

Whether you’re in construction, automotive, or appliance manufacturing, reliable steel testing methods like the cupping test play a vital role in your production success.

Learn more about our steel quality control at:
Galvanized