Technology · Compressive Strength
Compressive strength is the crushing load a board carries before failure, measured perpendicular to the face. Across this product line it runs from ≥ 1.5 MPa (218 psi) for the standard 300 grade to ≥ 23 MPa (3335 psi) for the 1200 grade — with the carbon-fibre 800 grade reaching ≥ 21 MPa at far lower density. Every value below is in both metric and US units.
Definition
Compressive strength (σc) is the maximum crushing load a material withstands before it fails, applied perpendicular to the board face. Flexural strength is the companion figure for bending. For a back-up lining or load-bearing position these decide how much weight the board carries; for pure insulation with no load they matter less. Higher density generally means higher strength — but reinforcement changes that, which is why the 800 grade out-performs denser grades.
| Quantity | Metric | US |
|---|---|---|
| Compressive strength (σc) | MPa | psi |
| Flexural strength | MPa | psi |
| Unit conversion | 1 MPa | = 145 psi |
| Load direction | Perpendicular to face | — |
Values indicative, confirmed on request. Density tolerance ±10%. Measured at room temperature unless stated.
Data
High-density structural grades in dual units. Strength rises with density — except the carbon-fibre 800 grade, which leads on compressive strength at low density.
| Grade | Density | Compressive (MPa) | Compressive (psi) | Flexural | Positioning |
|---|---|---|---|---|---|
| 800N-17 Carbon-Fibre | 800 kg/m³51.2 lb/ft³ | ≥ 21 | ≥ 3045 | ≥ 7.6 MPa1102 psi | Highest σc, low density |
| 850N-14 Structural | 850 kg/m³53.1 lb/ft³ | ≥ 14 | ≥ 2030 | ≥ 6.1 MPa885 psi | Structural balanced |
| 980Thermal Shock | 980 kg/m³61.2 lb/ft³ | ≥ 15 | ≥ 2175 | ≥ 7.0 MPa1015 psi | Thermal-shock resistance |
| 1020Molten Aluminum | 1020 kg/m³63.7 lb/ft³ | ≥ 17 | ≥ 2465 | ≥ 8.5 MPa1233 psi | Molten aluminum contact |
| 1200Heavy-Duty | 1200 kg/m³74.9 lb/ft³ | ≥ 23 | ≥ 3335 | ≥ 15 MPa2175 psi | Maximum strength |
All values measured perpendicular to face, room temperature; confirmed on request. Lower-density insulation grades carry lower strength — the standard 300 grade is ≥ 1.5 MPa (218 psi); 250 · 400 · 650 kg/m³ datasheet values on request.
Factors
Strength generally rises with density: 850 reads ≥ 14 MPa, 1200 reads ≥ 23 MPa.
N-17 carbon-fibre lifts the 800 grade to ≥ 21 MPa — above the denser 850/980/1020.
Compressive strength is measured perpendicular to the board face.
Listed values are room-temperature; hot strength is provided on request per grade.
Comparison
Compressive strength — the 1200 grade leads, the carbon-fibre 800 matches it at far lower density.
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