Sealing: The primary function of pharmaceutical glass bottle caps is to ensure that drugs are isolated from the external environment during storage, prevent external pollution such as dust and moisture, and thus ensure the quality and safety of drugs. This sealing is achieved through the tight fit between the bottle cap and the bottle mouth.
Moisture resistance: For certain solid drugs, such as tablets, capsules, etc., moisture resistance is crucial during storage. If the medicine is damp, it may decompose or spoil, affecting its efficacy. Some medicinal glass bottle caps are designed with special moisture-proof caps, which can integrate desiccants on the bottle cap to absorb moisture inside the bottle, thereby maintaining the dryness of the medicine.