The galvanized steel coil (GI) consists of at least 97% Zinc, with less than 0.3% Aluminum and solidified at 460℃ high temperature. One main feature of galvanized steel is its excellent corrosion resistance from sacrificial protection of the zinc. When the zinc layer on the surface isolates the steel sheet from atmosphere, it is able to prevent corrosion and keep long lasting life on the substrate.

    Furthermore, the features of this products are economic, various, and fulfill different requirements and applications, providing high added-value. Lately, the galvanized steel sheets are commonly used in many fields such as architectures, 3C products, home electronic appliances, color coating and living goods, etc.

    Al-Zn alloy-coated steel sheet has high corrosion resistance. It is also named GL. The surface is formed with diamond look spangles. 55% Al-Zn alloy-coated steel coils (GL) consists of 55% Aluminum, 43.4% Zinc, and 1.6% silicon, solidified at high temperature of 602℃. Its structure is compound by Al-Fe- Si-Zn, and become a protection layer to prevent corrosive penetration.

    GL steel sheets are commonly used in different fields, applications, corrosion resistance, and pre-painted products as well. In the following table, it shows the classifications and features of GL steel surface treatment.

【Surface treatment and Classifications】

Corrosion Resistance：
    The GI corrosion resistance is derived from Zinc sacrificial protection. Then, the GL corrosion resistance is from the Aluminum barrier protection, and Zinc sacrificial protection.
    Through outdoor exposure tests in various atmospheric environment for 55% Al-Zn alloy-coated steel coils, the result proved its protection is better than the galvanized steel sheet.

Heat Resistance / Heat Transmission and Reflectivity：
    Aluminum has excellent heat reflectivity properties, and is commonly used in architectures materials. It can be used to reduce the heat energy, regulate the room temperature. It is a energy-saving, environmentally friendly material. 55% Al-Zn alloy -coated steel products have better resistance to high temperature than galvanized products with regarding to its oxidation features. Therefore, 55% Al-Zn alloy- coated steel products can be used in a temperature up to 300℃.

Weight-saving：
    The Aluminum specific gravity is about 3.69g/cm3, and the Zinc is about 7.13g/cm3 . To make a comparison between GL and GI steel coils based on the same subtracts and coating weight terms, the length of 55% Al-Zn alloy-coated steel coils is longer 1~3% than Galvanized coil. (Minor differences is acceptable)

Comparison Table of GL / GI：

    It is the only one 3 coating, 3 baking automatic continuous color coating production line in Taiwan. Also, it is one of the most competitive pre-painted lines in the world.

    The line with distinguishing features to produce high quality color coils, such as special high film thickness coils, self cleaning coil, eco efficiency coil, high duration proof UV coil, high quality home electrical appliances pre-painted coil, high gloss lacquer decoration ,spangle texture, hammer paint(PCM coil) etc.

    It applies various colors for customers' demands. Excellent weather resistance, corrosion resistance.

    ROSPERITY TIEH NICE MATT STEEL, a high efficiency, high reflectivity, new generation material Pre-Painted product which use the latest 3 Coating 3 Baking (3C3B) technology. It is a unique high technology device in Taiwan. NICE MATT STEEL Pre-painted Products have polymer and formula in order to have one more protection, save up to 50% fading opportunity. This characteristic points to its distinguished performance in color preservation. Furthermore, the surface of Pre-painted steel is smooth, well Hydrophilic, dust and pollutants in the air do not easily attach onto the surface.

     It is applicable to residence, commercial zone, light industrial, roofing in countryside, roofing in plants, wall, interior siding. This product always keep its vivid colors after use long term, thus, is able to hence its additional value.

Structural Engineering & Construction：
    Public construction/ Chimney/ Ceiling/ Solar energy plate frame/ Truss/ Roofing/ Door case/ Building beam/ Wall/ T-Bar/ Fast roller door/ Artistic-roofing /Building material...etc.

Transportation：
    Auto parts / Container partition / Path indicators/Soundproof wall/ Fences/ Conveyor frame / Traffic signal...etc.

Electrical Appliances：
    Electrical appliances components/Air conditioner/ Vending machines/ Electrical panel/ Switch panel/ Freezing chambers/Electrical components/ Tooling box/ Microwave oven/ Fan...etc.

Furniture & Hardware：
    Decoration/ Office equipment/ Toolbox/ Pail…etc.

Computer’s Appliances：
    Computer case/ Copy machine/ Printer/ Scanner…etc.