SIS F9

The SIS F9 paper size establishes very compact dimensions of just 42 mm x 60 mm, enclosing a mere 0.0025 square meters. Wedged between lesser used SIS F8 and ISO B8, it represents one of Sweden's generally unsuccessful 20th century attempts to expand format options.

Lacking broad recognition, the niche SIS F9 does not benefit from entrenched alternate monikers. But occasional Swedish references as “F nio” (F nine) persist informally.

Conceivable applications could include large diagrams, folding charts and graphs, academic posters, and marketing displays where SIS F8 still disappoints. But everyday practical use is extremely minimal for the unfamiliar SIS F9.

The SIS F9 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 F9 remains an obsolete relic, its backstory illustrating the resilience of existing standards despite reform efforts.