This standard specifies a method for determining the hydroxyl value of unsaturated polyester resins. This method determines the difference between the hydroxyl value and the acid value. It is therefore necessary to determine the total acid value separately, in order to calculate the hydroxyl value.
DS/EN ISO 2554:1999 history
1999DS/EN ISO 2554:1999 Plastics - Unsaturated polyester resins - Determination of hydroxyl value