Propack desiccant bags are certified according to DIN standards.
The Deutsches Institut für Normung (German institute for standardization, known as DIN) is a german organization for definition of standard. Founded in 1917 and named Normenausschuss der deutschen Industrie (Asociation for standards in the german industry), then has been renamed in 1926 and again in 1975. Today the official name is "DIN Deutsches Institut für Normung e. V".
www.din.de