• Bespoke boxes
  • Bespoke folders
  • Bespoke sheet materials

Boxsite Archival Materials Information

All materials available on Boxsite are acid-free and archival. This means that you know the products you make with us are suitable for long term storage. The various materials we have available are listed below.

Acid Free White Archival Card/Board

Archival and acid-free buffered board, high quality single-ply material ideal for lightweight mounting and backing boards, making folders, envelopes and lightweight boxes. 0.5mm thick. Suitable for long term storage and display applications.

  • Ideal for making a wide range of enclosures, including boxes, folders, 4-flap envelopes, backing boards and more
  • Natural white, solid colour - 0.5mm thick
  • Free of optical brightening agents
  • Passed the Photographic Activity Test for safe storage of photographic materials
  • 100% bleached cellulose, free of wood fibres, lignin-free
  • pH 7.5 - 10.0 = acid-free (in accordance with ISO 6588-1:2012)
  • Alkaline buffer for protection from acid > 3% natural calcium carbonate (GCC)


Acid Free Manilla Card

Acid-free archival quality card ideal for making folders, wraps and envelopes. Can also be used as backing or interleaving card.

  • Acid-free ideal for long term storage of papers and more
  • Buffered (3% calcium carbonate) for protection from migrant acidity which could attack your documents
  • Heavyweight 244gsm card with moderate porosity allowing contents to breath
  • ISO9706 international standard for long life papers and board
  • Colours will not bleed into contents
  • Soil resistant


Acid Free Corrugated Board

Our Archival corrugated board is available in 1.6mm and 3mm thicknesses and perfect for long term storage. It is PAT passed for safe storage of photographic materials. The white flute means any cut edges still look great, along with the white interior and light grey exterior. Ideal for making bespoke archival storage boxes. A detailed specification is below:

boxes in line

Archival Corrugated Board Specification:

  • 100% bleached cellulose
  • No recycled fibresArchival Board 3mm Crease
  • Free of wooden fibres
  • Kappa level 1 – 2 = lignin-free
  • pH 7.5 - 10.0 = acid-free (in accordance with ISO 6588-1:2012)
  • Alkaline buffer > 3 % natural calcium carbonate (GCC)
  • Sizing: neutral/synthetic (without alum additive)
  • Without optical brightening agents
  • Light-fastness 5 – 6 (good – very good) in accordance with the wool scale (ISO 105- B02)
  • Special surface strengthening (dirt-resistant and erasable)
  • No bleeding in accordance with DIN ISO 16245:2012
  • Photographic Activity Test (PAT) passed in accordance with ISO 18916:2007
  • Glue used for lamination free of solvents and plasticisers (softening agents)
  • pH approx. 7.0