There is a triangle under the water cup with a number inside, indicating the material of the water cup.

Plastic name--------code and corresponding abbreviation code are as follows:

Polyester———— 01—PET (Pet bottle)

High density polyethylene—— 02—HDPE

Polyvinyl chloride———— 03—PVC

Low density polyethylene—— 04—LDPE

Polypropylene———— 05-PP (can withstand temperatures above 100 degrees)

Polystyrene———— 06-PS (heat-resistant to 60-70 degrees, can hold hot drinks Produces toxins and releases styrene when burned)

Other plastic codes - 07—Others

That is to say, if there is 05 in the triangle, it is PP~ Of course, generally speaking, cups The name of the material will be written directly on the label