SKT® Coating Corrosion Performance Testing Report

This R&D testing report introduces the corrosion resistance performance of Taiwan Shan Yin SKT® Coating screws through salt spray testing, UV light exposure comparison, seawater testing, acid liquid testing, and coating adhesion observation. The report helps buyers understand how SKT® Coating supports surface protection for screws and fasteners used in construction, decking, outdoor, wood, and industrial applications.

SKT® Coating is Taiwan Shan Yin's patented nanometer coating technology developed for fasteners that require corrosion protection under different atmospheric conditions, pollutants, moisture exposure, treated wood applications, and other corrosion-related environments. The coating can be applied to various screw and fastener products according to customer and market requirements.

SKT® Coating Superior Corrosion Performance

SKT® Coating screws have been tested for corrosion resistance performance, including salt spray testing per ASTM B117 and Kesternich testing. According to the original testing report, SKT® Coating passed up to 2,500 hours of salt spray testing and 20 cycles of Kesternich testing.

SKT® Coating is available in different salt spray test performance levels, including 500 hours, 1,000 hours, 2,000 hours, and 2,500 hours, with customized colors available depending on customer requirements.

Salt Spray Test Comparison per ASTM B117

The salt spray test comparison shows the red rust hours of different stainless steel and coated screw samples. According to the original data, SKT® Coating screws demonstrated longer salt spray test performance than the listed stainless steel screw samples in this comparison.

This result supports the use of SKT® Coating screws for applications where corrosion protection is important, such as outdoor fastening, decking, construction screws, ACQ-treated wood, wood screws, and industrial fastener applications.

Coating Adhesion Observation

• SKT® Coating screws showed no visible peeling after fastening into hard wood in the demonstrated observation.
• Other brand coating showed peeling after fastening into hard wood in the demonstrated observation.
• Coating adhesion is important for coated screws used in construction, decking, outdoor wood, treated wood, and other fastening applications where surface protection and installation stability are required.

Passed Tests and Approvals

• C4 approved by SZU.
• Passed ILAC-MRA laboratory tests of 2,500 hours SST per ASTM B117 and 20 cycles Kesternich test per DIN 50018-2.0S requirements.
• Approved by Michigan State University's National Environmental Protection Laboratory in the USA.

UV Light Exposure Test

The ISO 11507 UV light comparison test evaluated coating color stability after UV exposure. The original test image shows a comparison between other brand coating, RAL color card references, and TSY SKT® Coating after long-term UV light exposure.

• Test period shown in the original report: from 2012/09/06 to 2012/10/24, total 1,152 hours.
• RAL color references include White RAL 9016, Dark Grey RAL 7004, and Black RAL 9005.
• The original report indicates that TSY SKT® Coating maintained color consistency with the RAL color card under UV light exposure over 1,000 hours.

Seawater and Acid Liquid Performance

The original report also shows SKT® Coating screws tested in seawater and acid liquid conditions. According to the demonstrated results, SKT® Coating lasted over 1,500 hours in seawater and acid liquid without visible corrosion in the shown samples, while the competitor coating showed red rust after 1,000 hours in seawater.

This testing information demonstrates Taiwan Shan Yin's R&D testing approach for fastener coating performance, corrosion resistance, coating adhesion, UV exposure, seawater resistance, and acid liquid resistance. For international buyers, these results can help evaluate SKT® Coating screws for outdoor, construction, decking, treated wood, and industrial fastening applications.