This International Standard specifies a method for the determination of the hardness of vulcanized rubbers with hardness in the range 10 to 35 IRHD.
The range of applicability of this and other ISO hardness test methods for vulcanized rubbers is indicated in figure 1 :
DS/ISO 1818:1979 history
1979DS/ISO 1818:1979 Vulcanized rubber of low hardness (10 to 35 IRHD). Determination of hardness