高幟免保溫材PIRALU隔熱風管系統
GOLDEN FLAG PRE-INSULATED ALUMNIUM
DUCT BOARD
Application of PIRALU panels：
Installation Requirements
PIRALU 20
PIRALU 30
High hygiene capacities
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Where ducting of fiber glass is traditionally used
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Where they traditionally used sheet ducting.
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Ducting of small and medium size
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Medium to large ducting
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Low and medium pressure levels (>1,000Pa)
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Medium and high pressure levels (<1,400Pa)
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Normal insulation capacities
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High insulation capacities
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Visible installations
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Installed in the interior of a building
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Little loading on the building structure
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High resistance
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Comparison Chart -- PIR vs PUR(PU)：
　
PUR(PU)
PIR

Main Ingredient

　		 polyurethane 

polyisocyanurate(basically an improved type of rigid polyurethane PUR), because its production process creates strong isocyanurate linkages in the molecular structure. Chemical breakdown of the PIR foam occurs at higher temperatures than PUR, so it is much more difficult to ignite.

Advantages

high strength to weight ratio & thermal efficiency

PIR combines PUR benefits, such as rigidity, lightweight and thermal efficiency, with the key addition of lower flammability.

Fire reaction

 　

Degradation of PIR commences at a higher temperature than PUR. A fire would need to be much more seriously developed before PIR foam might significantly contribute to the spread of the fire through a building.  PIR also forms a surface char, helping to insulate the underlying foam from the fire.

Chemical Structure

　

Made by reacting the isocyanate (MDI) with certain types of polyol, such as a polyether

differs from PUR in that it is produced using an excess of the MDI component. In the presence of an appropriate catalyst the excess MDI reacts with itself to form isocyanurate which is characterised by greater heat stability

Chemical Breakdown

Breakdown occurs at 230-250℃

For true PIR foam with 50% or more isocyanurate linkages, breakdown occurs at 400℃