What plastic is used for the mouthwash cup?

There are many kinds of plastics that can be used to make mouthwash cups. See if there is a circular sign at the bottom of the plastic cup, that is, the kind where the numbers are written in a small triangle. If there are figures, it will be easier to check. 1 is pet 2, hdpe 3, pvc 4, LDPE 5P6ps7pc. All the abbreviations I gave were plastic. Generally, the 5th and 7th are the time to make cups. 5 is polypropylene and 7 is polycarbonate. Of course, using these two materials is the safest and most reliable, and there is no problem drinking water from this cup. If it is a knockoff cup, the specific material is not guaranteed. Let's see if the cup is opaque. If it is transparent, it may be PC (polycarbonate), AS (acrylonitrile-styrene) and PET (polyethylene terephthalate) mentioned above. If it is translucent, it may be PE (polyethylene) or PP (polypropylene). If it is opaque and colored, it may be PVC (polyvinyl chloride) or some synthetic plastics or recycled plastics. To sum up: comprehensive consideration of cost, safety and processing technology. AS (acrylonitrile-styrene) and PET (polyethylene terephthalate) are commonly used now. Supplement: If it is a drinking cup (after all, it can definitely be used as mouthwash), there are also PP (polypropylene) and PC (polycarbonate), but the cost is very high. There is no need to use such good materials for gargling.