1. It should be suitable for the old and tender, and it should be sticky and not moving on the skin.
2. The appearance should be oily and delicate, and should not be irritating to the skin.
3. The spreading amount of the same plaster should be the same, and the weight difference limit should not exceed ±5% (refers to the weight of the pure plaster without the backing material).
4. Stored at room temperature, it will not deteriorate within two years without losing its viscosity.