2008DIN EN ISO 21078-1:2008 Determination of boron (III) oxide in refractory products - Part 1: Determination of total boron (III) oxide in oxidic materials for ceramics, glass and glazes (ISO 21078-1:2008); English version of DIN EN ISO 21078-1:2008-04
1998DIN 51086-1:1998 Testing of oxidic raw materials and materials for ceramics, glass and glazes - Part 1: Determination of boric oxide