The standard is valid for the establishment of classes and qualities of mortars for silica and fireclay bricks (see DIN 1089 part 1 and part 2) which are used for the construction of coke ovens.
DIN 1089-3:1990 history
1990DIN 1089-3:1990-10 Refractories for use in coke ovens; mortar for silica and fireclay bricks; requirements and testing
1990DIN 1089-3:1990 Refractories for use in coke ovens; mortar for silica and fireclay bricks; requirements and testing