A laboratory is an essential part of the quality control system, reflecting a factory's ability to manage the entire production process-from raw materials to processing and final products. It plays a critical role in ensuring product quality and earning customer trust and satisfaction.
Our address
No.16, No.24 Road, South Area Jinghai Economic Development Zone, Tianjin City , China.
Laboratory testing capacitys
Raw Material Testing
Duowei is equipped to independently test the chemical composition and mechanical properties of raw materials. Instead of relying solely on Mill Test Certificates (MTCs), we conduct sample testing to verify that the actual material performance meets project requirements.
Color-Coated Steel Sheet Testing
For exterior sandwich panels, consistent color is crucial. Even coils from the same mill may have noticeable color differences across batches. Duowei performs tests for paint film thickness, zinc coating weight, and color difference. Any coils with significant inconsistency are rejected and returned to the supplier, ensuring uniform appearance.
Core Material and Bonding Quality Testing
All core materials, such as rock wool and PIR, undergo strict testing-e.g., water repellency tests for rock wool and oxygen index tests for PIR. Bond strength between the steel sheet and the core is verified through pull-off tests to ensure strong adhesion.
Accessory Testing;
Accessories such as self-tapping screws are subject to salt spray testing, high/low temperature and humidity testing, and UV aging tests. We enforce strict quality standards for accessory suppliers to ensure not only the panel quality but also the overall performance of the wall and roof system.
Welding Inspection
Duowei holds MT (Magnetic Particle Testing) certification, allowing us to inspect welds for structural integrity and ensure safety from the source.
Duowei invests heavily each year in maintaining and calibrating its laboratory equipment. We firmly believe that such investment is worthwhile-only by delivering high quality can we earn long-term customer satisfaction and trust.