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  1. Wikipedia
    https://en.wikipedia.org › wiki › Polyisocyanurate

    Polyisocyanurate - Wikipedia

    • Polyisocyanurate , also referred to as PIR, polyol, or ISO, is a thermoset plastic typically produced as a foam and used as rigid thermal insulation. The starting materials are similar to those used in polyurethane (PUR) except that the proportion of methylene diphenyl diisocyanate (MDI) is higher and a polyester-derived polyol is used in the reaction instead of … See more

    Manufacturing

    The reaction of (MDI) and polyol takes place at higher temperatures compared with the reaction temperature for the manufacture of PUR. At these elevated temperatures and in the presence of specific cat… See more

    Uses

    PIR is typically produced as a foam and used as rigid thermal insulation. Its thermal conductivity has a typical value of 0.023 W/(m·K) (0.16 BTU·in/(hr·ft ·°F)) depending on the perimeter:area ratio. PIR foam panels lami… See more

    Health hazards

    PIR insulation can be a mechanical irritant to skin, eyes, and upper respiratory system during fabrication (such as dust). No statistically significant increased risks of respiratory diseases have been found in studies. … See more

    Is Pir a fire retardant?
    PIR is at times stated to be fire retardant, or contain fire retardants, but these describe the results of "small scale tests" and "do not reflect [all] hazards under real fire conditions"; [better source needed] the extent of hazards from fire include not just resistance to fire but the scope for toxic byproducts from different fire scenarios.
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    Manufacturing
    Uses
    Health hazards
    Is Pir a fire retardant?
     
  1. DUNA-Group
    https://www.dunagroup.com › en › glossary

    PIR - POLYISOCYANURATE - DUNA-Group

  2. Wikipedia
    https://en.wikipedia.org › wiki › List_of_esters

    List of esters - Wikipedia

  3. greencoreproducts.com
    https://greencoreproducts.com › what-does-pcr-and...

    What Does PCR and PIR Mean, and What is it? - Greencore Products

  4. ScienceDirect
    https://www.sciencedirect.com › science › article › pii

    Influence of the chemical structure of polyester polyols on the ...

  5. Chemistry LibreTexts
    https://chem.libretexts.org › ... › Esters › Nomenclature_of_Esters

    Nomenclature of Esters - Chemistry LibreTexts

  6. People also ask
    What are PIR foams made of?
    PIR foams made with STEPANPOL or TERATE polyester polyols deliver superior insulating performance, applied economics and reliability. This results from the combination of our proprietary technology, application expertise, and world-class manufacturing practices.

    Stepan Polyester Polyols for Rigid Foam - Stepan Company

    stepan.com
    What is PIR insulation?
    Despite PUR’s benefits, PIR insulation builds upon them. PIR (polyisocyanurate), typically cut into boards, can be used in insulated metal panels, wall cavities and as insulated plasterboard. PIR has such a high thermal performance, it requires only half the thickness of other mineral-based insulation products.

    PUR vs. PIR: Know the Difference | Kingspan US

    kingspan.com
    Is Pir a fire retardant?
    PIR is at times stated to be fire retardant, or contain fire retardants, but these describe the results of "small scale tests" and "do not reflect [all] hazards under real fire conditions"; [better source needed] the extent of hazards from fire include not just resistance to fire but the scope for toxic byproducts from different fire scenarios.

    Polyisocyanurate - Wikipedia

    en.wikipedia.org
    How does PIR foam react with polyol?
    In PIR foams, the iso components react with each other in trimerization reactions to form isocyanurates. Excess iso reacts with polyol to form urethane linkages as well. PIR and PUR are both derived from polyurethane, a plastic material invented by German scientist Otto Bayer and his colleagues in 1937.

    PUR vs. PIR: Know the Difference | Kingspan US

    kingspan.com
    What is the difference between PIR & PUR indices?
    PIR typically has an MDI/polyol ratio, also called its index (based on isocyanate/polyol stoichiometry to produce urethane alone), higher than 180. By comparison PUR indices are normally around 100. As the index increases material stiffness the brittleness also increases, although the correlation is not linear.

    Polyisocyanurate - Wikipedia

    en.wikipedia.org
    Which FTIR spectra show the characteristic absorption bands of polyester polyols?
    FTIR spectra of the polyols show the characteristic absorption bands of polyester polyols: large O-H stretch centered around 3400 cm −1, C-H bands at 2860 and 2930 cm −1, an intense C=O stretch band relative to ester bonds at 1715 cm −1 and two sharp peaks at 1580 and 1600 cm −1 corresponding to the aromatic C-H ( Fig. 1 b).

    Influence of the chemical structure of polyester polyols on the

    sciencedirect.com
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  7. Stepan
    https://www.stepan.com › content › dam › stepan-dot-com › ...
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    Stepan Polyester Polyols for Rigid Foam - Stepan Company

  8. National Center for Biotechnology Information
    https://www.ncbi.nlm.nih.gov › pmc › articles

    Study on the Structure-Property Dependences of Rigid PUR-PIR …

  9. Kingspan
    https://www.kingspan.com › us › en › knowledge-articles › pur-vs-pur

    PUR vs. PIR: Know the Difference | Kingspan US

  10. Stepan
    https://www.stepan.com › content › stepan-dot-com › en › ...

    Chemical Solution Additives for Polyester Polyol Insulations | Stepan