First, it lacks chemical bonds that are vulnerable to sunlight. ASA replaces the butadiene rubber found in ABS with acrylate rubber. Butadiene contains unsaturated double bonds that break down under UV exposure, causing the material to age, fade, and chalk. Acrylate lacks this weakness-which is the fundamental reason why ASA's weather resistance is ten times that of ABS.
Second, it does not become brittle or crack at low temperatures. Even in the freezing cold of -30°C, ASA retains 75% of the impact resistance it exhibits at room temperature. While ordinary materials might shatter upon impact during northern winters-where temperatures drop to -20°C or -30°C-ASA can still be nailed and cut without issue.
Third, the color is integral to the material. The pigment is dispersed throughout the co-extruded layer rather than being applied as a surface coating. Even if scratched, the color remains consistent; there is no exposed base material or unsightly mottling.
It does not rely on a protective coating; the material itself is inherently resistant to sunlight.
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