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Schauenburg Industries Ltd.
Fiberglass Ducting - Fire Resistant Phenolic Resin
Schauenburg fiberglass ducting is manufactured using phenolic resins. One of the main attractions of phenolic materials is its fire performance. The table below shows some typical fire test results for phenolic/glass composites and compares these to polyurethane and polyester.
Fire Properties of Phenolic/Glass Composites Compared with Polyurethane and Polyester
Property | Phenolic | Polyester | Rigid Polyurethane |
ASTM D229 - Oxygen Index | 45-55* | 40 | 20-25 |
ASTM D229 - Rate of burning | Does not ignite | - | - |
BS 476 PT.7 - Spread of Flame | Class 1 (Zero Spread) | Class 1 | Class 1 – Class 4 |
Toxicity of combustion products | Very low | Toxic | Toxic |
Smoke | Virtually NIL | Very high | Very high |
* Catalyst Dependent |
When phenolic resin fiberglass ducting is exposed to fire they char on the surface which further protects the underlying layers from the heat source. In extreme conditions when fire does destroy the product only gasses of Carbon, Hydrogen and Oxygen are produced. This in essence means that the phenolic will and can only finally break down to form Carbon Dioxide, Water and Carbon Monoxide. These gasses will result from any form of combustion. A most significant factor is also the very low levels of visible smoke produced. See test results.
Phenolam Laminate Test Results
Test – Flammability | ASTM Test | Results | |
NBS Smoke Chamber | E-622 | ||
D16 | >5 min. | ||
Dmax | 42 | ||
Radiant Panel Test | E-162 | 6.7 | |
Tunnel Test | E-84 | ||
FS1 | 19 | ||
Smoke | 12 | ||
Limiting Oxygen Index | D2863 | 67 | |
Thermal |
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Heat Deflection @ 264 psi | D-648 | >570°F | |
Linear Thermal Expansion | 2.93 x 10.5 m/in. °F | ||
Specific Heat @ 50°C | 0.3 cal/ g°F |
The physical properties of phenolic fiber reinforced composites are retained to at least 200°C at which temperature other matrix resins have generally degraded substantially. The inherent fire properties of phenolic resins composites are excellent having the highest fire rating in all test methods, extremely low smoke emission and virtually no toxic combustion products. E.M.R. Flame Certificate Number 395.
Fire Retardency and Flammability Video