behavior of polyurethane foams may be achieved through the introduction of isocyanurate structures into polyurethane matrix, as these are more stable than urethane bonds [7]. We recommend end-users view the pdf version of this document under our Technical Bulletins, and indeed puruse other Technical Bulletins from Dyplast that address these differences. By comparison polyurethane indices are normally around 100. Because both materials offer high R-values (R 5.6 to R 8) per inch of thickness, you can use a thinner foam board to achieve the required thermal resistance. POLYISO VS. POLYURETHANE PROPERTIES SERVICE TEMPERATURE While incorporating the isocyanurate structure into polyiso does not affect thermal conductivity, it plays a major role in improving most other key properties. A surprisingly large number of potential buyers of polyurethane (PUR) foam cores for composite applications are unaware of the advantages or even the existence of polyisocyanurate (polyiso or PIR). Copyright©2021, Dyplast, All Rights Reserved, Direct inquiries to info@dyplastcomposites.com, Follow Composite Foam Core on social media, Foam Cores for Sheets, Shapes and Custom Parts, Dyplast Special Cuts for Customized Composite Shapes, Foam Cores for Sheets/Shapes/Custom Parts (up to +350°F continuous), Dyplast Special Cuts for Higher Temperatures. The key difference between the two materials is that polyisocyanurate passes the Factory Mutual Calorimeter fire test (FM 4450) without such thermal barriers, whereas polyurethane does not. PUR foams are essentially made by reacting a “polyol” component and an “iso” component in Since ISO-CF two-pound density foam core is 97% closed cell, it has a low permeance to water (2.5 perm-in) and very low water absorption characteristics (0.5% by volume). As the index increases material rigidity (stiffness) increases. Rigid foam cores under the general category “polyurethane” can be made with quite different formulations and therefore quite different physical properties and performance characteristics. Thermal Insulation, Polyurethane and Polyisocyanurate, Boards Faced [Annex] MASTERFORMAT: 07 21 13.07 . Rigid polyurethane foam is a highly cross-linked thermoset plastic of low density. It will also take on water when in a damp environment or used underground, so it must be adequately protected with a suitable diffusion retarder. POLYISOCYANURATE VS. POLYURETHANE PROPERTIES A. Dyplast’s ISO-CF polyiso is ideal for composite foam core temperatures between -297 and +300°F. Hopefully, in the future, polyiso brand foams such as ISO-CF will not be confused with the urethanes and will be recognized as a distinctly different and superior foam core for structural composite applications. Some may even think they're the same thing. 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 a polyether polyol. The starting materials are similar to those used in polyurethane except that the proportion of methylene diphenyl diisocyanate (MDI) is higher and a polyester-derived polyol is used in the reaction instead of a polyether polyol. (organic chemistry) A form of polyurethane polymer, based on cyanuric acid, formed from a polyhydroxy alcohol and a diisocyanate; it forms foams that are used for thermal insulation. Just 13 years later in 1967, scientists improved upon PUR’s thermal stability and flame resistance to create polyisocyanurate (PIR). Both polyurethane rigid foam (PUR) and its variant polyisocyanurate or rigid polyiso foam (PIR) display excellent thermal insulation properties – but do you know the difference between them, and why should it matter? As the index increases material rigidity (stiffness) increases. Scope . Energy efficient buildings, such as those using polyurethane and polyiso foam products, use less energy to heat and cool, requiring less fossil fuel use and emitting fewer greenhouse gas emissions. While incorporating the isocyanurate structure into polyiso does not affect thermal conductivity, it plays a major role in improving most other key properties. One such property is the service temperature. core in IMPs is often characterized as either a “PUR” (polyurethane) or “PIR” (polyisocyanurate) depending on the expected chemical reactions of the two primary components in the foam. I think there are two good choices for Exterior Rigid Foam Insulation. dans le PIR3. It is also a closed cell thermoset polymer formed by reacting a di- or poly-isocyanate with a polyol. Polyisocyanurate Foam Polyisocyanurate foam (PIR), also referred to as PIR, polyiso, or ISO, it is very similar as polyurethane foam. This product is an improvement of previously used PUR boards (polyurethane), typically produced as a foam and used as rigid thermal insulation. Foil is a vapour barrier and a very good one at that, it fact it stops even more moisture than the normal 6 mil polyethylene normally used. 6. Non-asbestos Calcium Silicate insulation board and pipe insulation feature with light weight, low thermal conductivity, high temperature and chemical resistance. Polyurethane will degrade and fall apart in sunlight unless ultraviolet inhibitors are used in the formulation. At these elevated temperatures and in the presence of specific catalysts, MDI will first react with itself, producing a stiff, ring molecule, which is a reactive intermediate (a tri-isocyanate isocyanurate compound). The chemistry of polyiso isbased on a … 3.2 Properties, Uses and Applications Compared to other forms of foam insulation, polyisocyanurate foam insulation Saving energy in buildings becomes more important every day. The chemistry of ISO-C1 and ISO-HT polyisocyanurate (polyiso or PIR) is basedon a modification of the traditional polyurethane formulations. This structure is rigid enough to resist movement by the fabricated foam, making the “growth” and “warp” which has been associated with urethane type foams very negligible with polyiso. As a result, the boards have a very high R-value, typically around R-7 or so per inch of board. Dyplast’s polyisocyanurate brands include a complete line of rigid polyisocyanurate foam bunstock available in a range of densities between 2.0 to 6.0 lb/ft3. These Evaluation istings apply to closedL -cell polyurethane and polyisocyanurate foam thermal insulation in the form of flat rigid … Note that while this Bulletin is focused on generic differences between PUR and PIR rigid foam cores for structural composite applications, there are indeed differences between the physical properties and performance characteristics of competing polyiso foam cores. It is poured between the two metal supports during production. Polyisocyanurate foam is similar in physical form to polyurethane foam but has improved dimensional stability over a wider operating temperature range, as improved insulating characteristics and fire/smoke resistance. This absorption is minimized by the chemical structure of Dyplast’s polyiso formulation. Very precise dimensions can be achieved to satisfy a variety of specialized or general composite foam core needs.Thus Dyplast’s ISO line of products is highly differentiated from historical urethane foams. Another important improvement which is seen with polyiso when compared to a urethane is in the flame resistance. The polyurethane foam world is very large and diverse – chances are good you are sitting on some kind of flexible polyurethane foam right now – but the useful products for composite-core applications are rigid foams. As nouns the difference between polyurethane and polyisocyanurate is that polyurethane is (organic chemistry) any of various polymeric resins containing urethane links; used in very many industrial and domestic applications while polyisocyanurate is (organic chemistry) a form of polyurethane polymer, based on cyanuric acid, formed from a polyhydroxy alcohol and a diisocyanate; it forms foams that are … You may need a PDF reader to view some of the files on this page. The cross-linked cyclical ring structure also helps it to resist chemicals and solvents. Foam core density of polyisocyanurate combined with 141b blowing agent equivalent to polyurethane’s density can cause numerous problems such as shrinkage of the core, and poor compressive, tensile and shear values are the result. This foam, upon contact with the air, solidifies and glues the two plates together, creating a monolithic product with a very high insulating value. 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