A clamshell box designed with a filing mechanism suitable for 4-holed pre-punched filing systems made of either transparent paper or of photographic mounting board material.

Many formats and sizes are readily available.

We confirm that our board and paper qualities and the products manufactured from them meet the following conditions:

100 % bleached cellulose (alpha cellulose)

without usage of recycled fibres

lignin-free ( free from wooden fibres)

acid-free; pH value 8,0 - 9,5 and in accordance with ISO 6588-1-2005 cold extract

Buffer sunbstance > 2 % natural calcium carbonate (GCC)

neutral / synthetic sizing (without alum additive)

with PAT certificate.

Herewith we guarantee that our board and paper qualities correspond to the technological basis of the ISO 9706 standard as well as to the DIN 6738 LDK 12-80 standard, which is the highest level of permanency.