What material is the transparent plastic cup made of and what to do if it turns yellow

Update:16 Jan 2021

What material is the transparent plastic cup made of
Transparent plastic cup is a kind of plastic packaging container with transparent white color formed by blow molding. After injection molding, the intermediate product preform is formed, and then the plastic bottle is formed by blow molding, which is the principle of two-step molding. The main materials for making transparent plastic cups are:

1. GPPS (polystyrene)
The advantage of GPPS is that it is cheap and transparent, and it is usually thrown away once it is done.

2. PET (polyethylene terephthalate)
Hard quality, good toughness, high strength, bright surface, environmental protection and non-toxic, transparent and multi-color sheets. The disadvantage is that PET high-frequency heating is more difficult, and the price is slightly more expensive than PVC. This material is often replaced by users who require high-end products and environmentally friendly products. PET materials are generally used to make plastic bottles for packaging food, beverages, and pharmaceutical industries.

3. PP (polypropylene)
The material is particularly soft, good toughness, environmentally friendly, non-toxic, and high temperature resistant. It is often made into packaging for dining utensils or other high temperature resistant products; but its plasticity is poor, processing is difficult, surface gloss is poor, and the color becomes lighter during processing. Used to make disposable plastic bottles.

4. PVC (polyvinyl chloride)
Soft, strong toughness, good plasticity, can be made into transparent and various colors, commonly used in transparent PVC packaging plastic bottles for cosmetics.

What to do if the transparent plastic water cup turns yellow
The reason for the yellowing of the transparent plastic cup is that it turns yellow due to water stains and excessive scale after a long time. It is very unsightly. You can use vinegar and water according to a certain ratio. After soaking for a period of time, clean it in time to restore the original color. , You can also use toothpaste and toothbrushes for scrubbing, and the cleaning effect is also very good. There is also a dry tea with baking soda, which can also be used for cleaning.