General medicinal grade (propylene glycol): Used for oral, external use, and coating.

For injection grade (propylene glycol for injection): ChP content ≥ 99.0%, diethylene glycol ≤ 0.001%, ethylene glycol ≤ 0.02%, epoxynon ≤ 0.001%, with extremely low microbial load; used for sterile preparations such as injections, inhalation, and eye use.