Our Mountboards
Conservation and Whitecore Specification
The surface and backing papers
- Made from chemically-treated pulp using pH sizing and lignin-free, except for Metallics which 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.*
- 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 air-borne acid for the life of the board.
The Core
- High-quality alpha cellulose. Lignin-free and bright white throughout.
- Buffered with calcium carbonate.*
- Passes the Silver Tarnish Test and Photographic Activity Test.
The adhesive
- Aqeous PVA with neutral pH.
- Buffered with calcium carbonate.*
- Is plasticiser-free.
* Minimum 3% by weight
Accelerated ageing testTAPPI T.509 SU68YearsUnaged- pH8.9100-pH8.9200-pH8.9300 -pH8.9
BlackCore Specification
The surface and backing papers (All finishes)
- Made from chemically-treated pulp using high pH sizing and lignin-free, except for Metallics which are not acid-free.
- Buffered with calcium carbonate.*
- 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 air-borne acid for the life of the board.
The Core
- Neutral
- Highly-refined wood pulp, sized with an alkaline (neutral) material.
- Buffered with calcium carbonate.*
The adhesive
- Aqeous PVA with neutral pH.
- Buffered with calcium carbonate.*
- Is plasticiser-free.
* Minimum 3% by weight
Accelerated ageing testTAPPI T.509 SU680 years-pH8.725 years-pH8.450 years-pH7.2100 years-pH7.2
BlackCore meets the FATG Standard level
