SIS F5

The SIS F5 paper size establishes compact dimensions of 169 mm x 239 mm, enclosing around 0.04 square meters. Wedged between lesser used SIS F4 and ISO B4, it represents one of Sweden's generally unsuccessful 20th century attempts to expand format options.

Lacking broad recognition, the niche SIS F5 does not benefit from entrenched alternate monikers. But occasional Swedish references as “F fem” (F five) persist informally.

Conceivable applications could include large brochures, folding charts and graphs, academic posters, and marketing displays where SIS F4 still underwhelms. But everyday practical use is extremely minimal for the unfamiliar SIS F5.

The SIS F5 emerged from Sweden's early 1900s endeavor inserting granular sizes amidst ISO's prevailing options. The vision was enabling subtle scaling of contents across sheets. But the attempt was undermined by economic obstacles, lack of global uptake, and resistance to shifting norms. So today SIS F5 remains an obsolete relic, its backstory illustrating the resilience of existing standards despite reform efforts.