Keyed EPS boards for cavity-wall insulation — continuous insulation built into the masonry cavity.
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PolyKey is Technopol SA's interlocking, fire-retarded FRCel EPS cavity-wall insulation element for double-leaf (double-skin) brick and blockwork, moulded at 20 kg/m³ (HD/20DV grade) with tongue-and-groove edges that key into the mortar courses to tie the two leaves and block mortar-drop.
| Property | Value | Standard |
|---|---|---|
| Thermal conductivity (λ, k-value @10°C) | ≤ 0.035 W/m·K | — |
| Thermal resistance R (60/40 mm element, guarded hotbox with wall ties) | 2.0 m²K/W | — |
| Nominal density / grade | 20 (HD / 20DV grade) kg/m³ (20 g/l) | — |
| Compressive stress at 10% deformation | ≥ 110 kPa | — |
| Reaction-to-fire classification | Class B (B-s1,d0) | SANS 53501-1 |
| Element / panel size (H × L × thickness, T&G profile) | 340 × 1200 × 60/40 mm | — |
| Applicable fire-test standards | SANS 53501-1 (reaction to fire); SANS 10177-9 (small-scale fire propagation) | SANS 53501-1 / SANS 10177-9 |
λ and compressive strength are grade-dependent values from Technopol's EPS grade datasheet for the HD/20DV (20 kg/m³) grade the brochure names — not a PolyKey-specific test. R = 2.0 m²K/W is the 2025 guarded-hotbox value for the 60/40 mm element tested with wall ties. Earlier brochures quote different figures (e.g. 2023: R 1.60 at 50 mm, 3.20 at 100 mm, 4.84 at 150 mm; 2014/2017: added R 1.5 at 60 mm). Technopol has never published a single authoritative R-table. Fire result is reaction-to-fire only. Class B / B-s1,d0 per SANS 53501-1 was obtained on a 60 mm EPS sheet at 18.37 kg/m³ (Ignis Testing report 2023-08-17 Technopol) and is scoped to the sample as tested. No fire-resistance (REI) rating exists — the element is encapsulated inside the masonry cavity.
Values from Technopol technical documentation. Confirm the exact figures for your specification with Technopol.
| Property | Value | Standard |
|---|---|---|
| Thermal conductivity λ @10°C | ≤0.035 W/m·K | |
| Thermal resistance R (60/40 mm element) | 2.0 m²K/W | guarded hotbox |
| Nominal density / grade | 20 (HD/20DV) kg/m³ | |
| Compressive stress @10% | ≥110 kPa | |
| Reaction-to-fire class | B-s1,d0 | SANS 53501-1 |
Every test report and certificate behind these figures is on the test-report register.
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