This article gives a comprehensive introduction to E282 calcium propionate, a globally recognized safe food preservative. It elaborates on its physical properties, antibacterial mechanism and wide applications in bakery products, grain foods, dairy, condiments and feed. The article analyzes its safety, proving that calcium propionate can be metabolized naturally by human bodies and is harmless within legal dosage. It also compares calcium propionate with sodium propionate, potassium sorbate and sodium benzoate in performance and applicable scenarios, summarizes its advantages and disadvantages. In addition, it puts forward standards for product selection and proper storage methods, providing professional guidance for food manufacturers and raw material purchasers. - Polifar