SIS E6

With dimensions of 110 mm x 155 mm, the SIS E6 defines a modest surface area of 0.017 square meters. Falling between SIS E5 and ISO A5 in the progression of Swedish width and height extensions, it is one of the more obscure niche formats.

The little used SIS E6 size does not typically go by any common alternative names. On occasion in Swedish contexts, it may informally be referred to by its metric measurements.

Practical use cases are quite limited given its lack of broad adoption, but could potentially include small pamphlets, postcards, and some greeting cards where SIS E5 is too large. However, the Swedish size extensions failed to shift the standards paradigm.

The SIS E6 emerged from Sweden's unsuccessful attempt to systematically interpolate granular sizes between ISO's deeply entrenched A, B and C formats. The vision was to enable subtle scaling of document contents across sheets. But the effort was undermined by manufacturing considerations, lack of global uptake beyond specialized niches, and the inertia perpetuating existing norms. So today SIS E6 remains an unused relic, its backstory one of ambition foundering on infrastructure rigidity and stasis.