Technical
Every published figure, with the standard it was tested against — and, beside it, what an independent laboratory measured on a sample of the board.
| Property | Standard | Unit | Stated | Measured |
|---|---|---|---|---|
| Density | ASTM C1185 | kg/m³ | 1,250–1,450 | 1,310.59 |
| Modulus of rupture (dry) | ASTM C1185 | MPa | > 10 | 12.63 |
| Direct screw withdrawal strength | ASTM D1037 | N | > 1,750 | 2,030.55 |
| Thermal conductivity | ASTM C177 | W/(m·K) | < 0.25 | 0.21 |
| Linear coefficient of thermal expansion | ASTM D696 | mm/mm/°C | 7 × 10−6 to 10 × 10−6 | 8 × 10−6 |
| pH value | Litmus test | — | 10–12 | 11.60 |
| Moisture content | ASTM C1185 | % | < 15 | 12.00 |
Every measured result meets the figure Cemtone states. Measured by an independent lab on one sample, September 2026.
| Test | Standard | Result |
|---|---|---|
| Impermeability | BS EN 12467 | Pass |
| Freeze–thaw resistance | BS EN 12467 | Pass |
| Heat–rain resistance | BS EN 12467 | Pass |
| Warm water resistance | BS EN 12467 | Pass |
| Soak–dry resistance | BS EN 12467 | Pass |
| Fire | Standard | Result |
|---|---|---|
| Non-combustibility test | ISO 1182 | Non combustible |
A material result, not an assembly rating. ISO 1182 tests the board.
The figures Cemtone publishes are ranges and minimums. In September 2026 a sample of the board was sent to an independent laboratory and measured, to find out whether the product meets what is claimed for it.
It does. Every one of the thirteen results met the published figure — density, modulus of rupture, screw withdrawal, thermal conductivity, thermal expansion, moisture content and pH, together with all five BS EN 12467 durability tests and non-combustibility.
Twelve of the thirteen were run to the standard Cemtone already publishes for them. The thirteenth, non-combustibility, was run to ISO 1182.
The laboratory report is held on file and is available to a specifier on request.
One sample, tested on one day. Not a certification, accreditation or factory audit, and no guarantee for later batches.
Cemtone operates quality, environmental and occupational health and safety management systems certified to ISO 9001, ISO 14001 and ISO 45001. The certifying body is QSCert.
| Standard | What it certifies |
|---|---|
| ISO 9001 : 2015 | Quality management system |
| ISO 14001 : 2015 | Environmental management system |
| ISO 45001 : 2018 | Occupational health and safety management system |
These certify the management system, not the board. Certificate numbers and dates are not published here; ask us before relying on one in a tender.
Data sheet, 3 pages · brochure, 12 pages. Both open in a browser or download.
Non-combustible is a result about the material, not a rating for a wall. ISO 1182 tests the board itself. A fire-rated wall or shaft is a complete assembly with its own test.
Density 1,250–1,450 kg/m³ is the mass of the material itself, not of a sheet. The weights you build with are on the board page.
Modulus of rupture above 10 MPa is the board's bending strength when dry, tested to ASTM C1185.
Screw withdrawal above 1,750 N is how hard a single screw resists being pulled straight out, tested to ASTM D1037.
pH 10–12 makes the board alkaline, which is normal for a cement product. Choose sealants, adhesives and paints rated for an alkaline substrate.
Five BS EN 12467 passes cover impermeability, freeze–thaw, heat–rain, warm water and soak–dry. For external use, freeze–thaw and heat–rain are the two that count. The category and class are not published: ask for both before specifying externally.
Stated figures are Cemtone's published data. Measured figures are one sample. Confirm both against a current test report before specifying.
Framing, spacing, gaps and fixing distances are on the installation page. Which thickness suits which job is on the board page.