High Impact Polystyrene (HIPS) has which UV resistance characteristic?

High Impact Polystyrene (HIPS) has which UV resistance characteristic?

• A. Poor resistance to UV light.
• B. Excellent UV resistance.
• C. UV resistance depends on colour only.
• D. UV resistance is not a property of HIPS.

Answer: (A)

UV resistance is about how a plastic holds up when exposed to sunlight. High Impact Polystyrene is known for lacking strong built‑in UV protection, so when it sits in sunlight it tends to degrade, leading to fading, chalking, and becoming brittle. That’s why its UV resistance is poor. Color alone doesn’t fix this—pigments can affect appearance and light absorption, but they don’t grant robust UV stability by themselves. UV resistance is a property of the material, and for outdoor use you’d typically use UV‑stabilized grades or add protective coatings to HIPS.

UV resistance is about how a plastic holds up when exposed to sunlight. High Impact Polystyrene is known for lacking strong built‑in UV protection, so when it sits in sunlight it tends to degrade, leading to fading, chalking, and becoming brittle. That’s why its UV resistance is poor. Color alone doesn’t fix this—pigments can affect appearance and light absorption, but they don’t grant robust UV stability by themselves. UV resistance is a property of the material, and for outdoor use you’d typically use UV‑stabilized grades or add protective coatings to HIPS.