Manufacturing
In the presence of specific activators and in an environment of excess MDI (high index), the NCO groups in MDI react to form cyclic macromolecules with isocyanurate structures. This is commonly known as trimerisation. The resultant cell framework has better flame retardancy than polyurethane structures.
Lasting values
Over time, the R-value of polyisocyanurate insulation may drop as some of the low-conductivity gas escapes and is replaced by air. This phenomenon is known as thermal drift. Experimental data shows that most thermal drift occurs within the first two years after the insulation material is manufactured, after which the R-value then slowly decreases.
Foil and plastic facings on rigid, polyisocyanurate foam panels, like LAMBDABOARD, help stabilise the R-value. Testing suggests that the stabilised R-value of rigid foam with metal foil facings remains unchanged, even after 10 years. |
.. LAMBDABOARD: impressive performance:
.Facing |
| VACR white/VN:Glass fibre tissue with mineral coating, matt white underside finish |
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.Density |
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.Thermal conductivity |
0,024(W/moC) @ 22oC mean temperature, aged |
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.Dimensions |
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20 mm to 150 mm thick
1 220 mm wide Length cut to size (maximum 13 500 mm) |
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.Fire Properties |
| SANS 428 protocol currently in testing phase, B1 obtained in phase one |
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