Introduction of Coil Coating
Our Coil Coating for roofs also offers a range of customization options to suit different design preferences and functional requirements. These include a wide variety of colours, gloss levels, textures, and other special effects that can be used to achieve the desired aesthetic effect. Additionally, specialized coatings can be used to improve the energy efficiency of the roof, reduce the heat island effect, and provide other performance benefits.
GL 55% Al-Zn Alloy Coated Steel
- Corrosion resistance
- High temperature resistance
- Heat reflectivity
- Formability and drawability
- Cost effective performance
Amcan Coil Coating was expanded in year 2000 to produce Pre-painted Steel Sheets in coil form with the technology collaboration with Yodogawa Steel Works Ltd of Japan on our Multi-Purpose Colour Coating Line.
Fully backed up by the Japanese Technology in steel and expertise in paint, Amcan Colour Coating Line is capable of applying a wide variety and range of colours on high quality (GL) 55% Al-Zn Alloy coated steel coils as the standard material to meet our customers’ requirement.
With an integrated quality control system in place at every stage of our production, the line system is able to offer a wide range of coated products like the Double Coat Double Bake for Regular Polyester.
Our Premium Series of Amcan Durafresh and Amcan Durafluor is another superior paint system offering higher durability and protection against common problems in tropical climates.
All these systems are able to cater for the requirements and standards of our customers in both the domestic and overseas markets.
Coating Composition of GL
Atmospheric Corrosion Resistance
The alloy coating of GL provides the optimum composition of aluminum and zinc for corrosion resistance and galvanic protection.
Atmospheric exposure test results confirm that corrosion resistance of GL is quite good, compared with zinc-coated steel sheet. As shown in Photo-1, the alloy coating has Al-rich phase and Zn-rich phase formed like net structure.
Accordingly, it provides galvanic protection to bare steel by a similar mechanism to zinc coatings, and also corrosion resistance of aluminum prevents the steel from rusting in good balance with zinc function. On the other hand, aluminum 100% coating itself cannot prevent the steel from rusting on its cut end section or if it has a scratch which reveals the bare steel.
(a) Atmospheric exposure test
Atmospheric exposure tests have been carried out ni USA for a long time. Each site is for example, severe marine, industrial or rural, and the results are as per Figure 1 to 3.
Each figure shows the relation between exposure time and corrosion rate in each area. The result of the tests indicates that GL sheet exhibits no evidence of rust on its flat portion under the condition where zinc-coated steel sheet (z27) has red rust on its whole surface.
GL sheet is confirmed to endure 3 to 6 times as zinc-coated steel sheet (z27), especially in the area of severe marine and industrial.
(b) Salt water spray test
The salt water spray test was carried out to the flat portion of GL in accordance with JIS Z2371 (35°C, 5% solution). The results is as per Photo-2.
Photo 2 shows that GL has no red rust while GI has red rust entirely.
Figure-4 is the results of salt water spray in both portion flat and bended (4R) between zinc coated sheet and GL sheet. It shows that GL has about 10 times of durability in corrosion resistance to zinc coated.
Heat Reflectivity
Heat resistance
Aluminum accounts for 80% (in volume ratio) of the Al-Zn alloy coating and consequently the GL sheets have heat oxidation resistance close to aluminum coated sheet.
GL sheets can be employed for long time under the temperature as high as 300 to 350°C.
The Figure-5 showns a relation between the durable temperature and heating hours for your reference. This figure shows that GL sheets have heat oxidation resistance under the condition of less than 300°C. Prior to practical use, the test piece is provided for your trial application.
Exposure Test Carried Out Worldwide
