Violet (280315) Mountboard Sheets

All Conservation mountboards fully comply to Fine Art Trade Guild Conservation level (Level 2).

• High-quality alpha cellulose using pH sizing and lignin-free, except for Metallics which the surface papers are not acid-free.
• Blue wool scale (BWS) minimum rating 3+.
• Individual BWS ratings are marked on the reverse side of every sheet.
• Buffered with calcium carbonate, minimum 3-5% by weight.
• The water-soluble extracts are minimal i.e. chloride below 0.05%, sulphate below 0.25%. For extra defence it contains a buffer of calcium carbonate to guard against contamination by airborne acid for the life of the board.
• Passes the Silver Tarnish Test and Photographic Activity Test.
• Aqueous PVA adhesive with neutral pH.
• Accelerated ageing test: TAPPI T.509 SU68
  • Unaged – pH8.9
  • 100 years – pH8.9
  • 200 years – pH8.9
  • 300 years – pH8.9