1. Core of the Base Material: 55% Galvalume Steel
The durability of colorstone metal roofing tiles primarily depends on their core material. Compared to ordinary galvanized steel, galvanized zinc steel has stronger corrosion resistance:
* Alloy Composition: Formed by 55% aluminum, 43.4% zinc, and 1.6% silicon at 600°C high temperature.
* Self-healing Function: When the cut edge of the steel plate undergoes corrosion, the aluminum layer forms a dense oxide aluminum protective film, while the zinc layer provides electrochemical protection for the cut edge through the sacrificial anode protection principle, ensuring that the base material is not corroded through for 30-50 years.
2. Root of Color: High-Temperature Sintered Basalt Colored Sand (Sintered Rock Chips)
The appearance lifespan of colorstone tiles mainly depends on the colored sand particles on their surface.
* High-Temperature Sintering Process: We use natural basalt particles and apply a sintering process at temperatures above 800°C to color them. This means that the color is "burned" into the rock rather than sprayed on the surface.
* Weather Resistance Indicators: This process enables the particles to have extremely strong UV resistance. In desert and tropical regions with strong sunlight, it ensures that the color remains fresh and does not fade or develop moss.
3. Foundation of Adhesion: High-Performance Modified Acrylic Resin (Acrylic Resin)
The adhesive is the key "glue" that connects the steel plate and the colored sand.
* Environmental Adaptability: High-quality modified acrylic resin must have excellent flexibility to cope with the thermal expansion and contraction caused by day-night temperature differences, preventing cracking or peeling of the colored sand layer.
* Anti-Mildew Self-Cleaning: The resin layer contains anti-mildew additives, which can effectively inhibit mold growth and achieve self-cleaning of the roof using rainwater.
4. Structural Mechanics: Unique Horizontal Fastening System
Unlike traditional roofing tiles that rely on gravity for stacking, colorstone metal tiles use the "Horizontal Nailing" installation technology:
* Wind Resistance Performance: Each tile is interlocked with the adjacent tiles and fixed horizontally on the hanging tiles. This structure enables the roof to form a whole and can withstand up to 200 km/h strong wind pressure, giving significant advantages in hurricane-prone areas.
* Lightweight Advantage: Each square meter weighs only 5-7 kg, only one-sixth of the weight of step tiles or cement tiles, significantly reducing the load on the building structure.
5. Key Industry Testing Indicators (Technical Standards)
In foreign trade purchases, professional buyers usually focus on the following data:
* Water Resistance: 24-hour immersion test, with no water droplets seeping out from the back.
* Impact Resistance: 500g steel ball dropped freely from 1 meter height, with no cracks or sand peeling off on the surface.
* Heat Resistance: Constant temperature for several hours in a 90°C ± 2°C environment, with no abnormal deformation of the tiles.
* Freeze-Thaw Resistance: After multiple cycles of -40°C to 50°C experiments, the coating does not peel off.
When choosing colorstone metal tiles, in addition to paying attention to the tile design aesthetics, it is necessary to verify the aluminum content (recommendation: ≥80g/㎡) and the steel plate thickness. For offshore buildings, it is recommended to choose a higher grade of aluminized zinc substrate to withstand the high salt fog corrosion in the air.
