SIS F6

The SIS F6 paper size establishes compact dimensions of just 120 mm x 169 mm, enclosing around 0.02 square meters. Wedged between lesser used SIS F5 and ISO B5, it represents one of Sweden's generally unsuccessful 20th century attempts to expand format options.

Lacking broad recognition, the niche SIS F6 does not benefit from entrenched alternate monikers. But occasional Swedish references as “F sex” (F six) persist informally.

Conceivable applications could include large diagrams, folding charts and graphs, academic posters, and marketing displays where SIS F5 disappoints. But everyday practical use is extremely minimal for the unfamiliar SIS F6.

The SIS F6 emerged from Sweden's early 1900s endeavor inserting granular sizes amidst ISO's prevailing options. The vision was enabling subtle scaling of content across sheets. But the attempt was undermined by economic obstacles, lack of global uptake, and resistance to shifting norms. So today SIS F6 remains an obsolete relic, its backstory illustrating the resilience of existing standards despite reform efforts.