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Product Classification
Views: 0 Author: Site Editor Publish Time: 2024-12-12 Origin: Site
The primary difference between Polyurethane (PU) and Polyisocyanurate (PIR) insulation boards lies in their chemical composition, thermal performance, fire resistance, and cost. Here's a detailed comparison:
PU (Polyurethane):
o Made by reacting a polyol with an isocyanate in the presence of catalysts and blowing agents.
o Contains fewer cross-linked bonds in its polymer structure compared to PIR.
PIR (Polyisocyanurate):
o Made by increasing the proportion of isocyanate during the reaction, leading to more cross-linking.
o This results in a more rigid and thermally stable structure compared to PU.
PU:
o Provides excellent thermal insulation with a typical thermal conductivity (lambda value) of around 0.022–0.026 W/mK.
o Effective in applications where moderate thermal insulation is required.
PIR:
o Offers slightly better thermal insulation with a lambda value of approximately 0.020–0.024 W/mK.
o Performs well in high-performance and energy-efficient applications due to its higher thermal resistance.
PU:
o PU is flammable and has a lower fire resistance compared to PIR.
o It may generate more smoke and toxic gases when burned.
PIR:
o PIR has significantly better fire resistance due to its highly cross-linked polymer structure.
o It chars rather than melts during exposure to fire, slowing down the spread of flames.
o Complies with stricter fire safety standards, making it suitable for applications where fire resistance is critical.
· Both PU and PIR have good resistance to water absorption and are commonly used in applications requiring moisture protection.
· PIR may offer slightly better durability in humid or wet environments due to its enhanced chemical stability.
PU:Slightly less rigid, but still strong enough for most insulation applications.
PIR:More rigid and dimensionally stable, making it suitable for demanding applications like roofing and high-load areas.
PU:
o Walls, floors, and ceilings in residential and commercial buildings.
o Refrigerated units and cold storage facilities where thermal insulation is a priority but fire resistance is less critical.
PIR:
o Roofing systems, industrial buildings, and areas requiring high fire resistance.
o Preferred for applications with stringent building code requirements for fire safety.
PU:Generally more affordable, making it a cost-effective choice for standard insulation needs.
PIR:More expensive due to its enhanced properties, particularly fire resistance and thermal performance.
Property | PU (Polyurethane) | PIR (Polyisocyanurate) |
Thermal Performance | Good | Better |
Fire Resistance | Moderate | High |
Rigidity | Slightly less rigid | Highly rigid |
Cost | Lower | Higher |
Best Use | Standard insulation needs | Fire-resistant, high-performance applications |
Choosing Between PU and PIR:
· Opt for PU if budget is a priority and fire resistance is less critical.
· Choose PIR for projects requiring higher thermal performance, fire safety, or compliance with stricter building codes.
