How to determine the plastic material for new boxes, PP or PS?
To choose the material, you should first know what features you desire to have for the your case and keep in mind the characteristic of each material. PP material’s Characteristics: PP is soft, sturdy, and better to withstand impact. The drawback with PP material is poor transparency. DVD boxes is mostly made of PP material. PS material’s Characteristics: PS material come in two types, GPPS and HIPS. GPPS features highest transparency and good rigidity, it’s ideal for display. Thus CD jewel case and calendar cases are usually made with GPPS. But GPPS is rather fragile and easy to break under pressure. HIPS is a modified PS material, it’s more flexible, but on the sacrifice of transparency. HIPS is often used for the black trays of CD jewel boxes.
