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). 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. 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. 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. Mineral wool slabs absorbed 8 to 38 times more water than foil-faced polyisocyanurate (PIR) and 4 to 19 times more water than coated glass-faced PIR. In fact, polyiso foams pass many of the mandatory burn tests without the addition of external flame retardants. Polyisocyanurate Foam Polyisocyanurate foam (PIR), also referred to as PIR, polyiso, or ISO, it is very similar as polyurethane foam. 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. The greater bond strength also means these are more difficult to break, and as a result a polyisocyanurate foam is chemically and thermally more stable; breakdown of isocyanurate bonds is reported to start above 200 °C, compared with urethane at 100 to 110 °C.Polyisocyanurate typically has an MDI/polyol ratio, also called its “index”, higher than 180. The term “rigid polyurethane foam” comprises two polymer types: Polyisocyanurate formulations, and polyurethane formulas. 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. 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? Non-asbestos Calcium Silicate insulation board and pipe insulation feature with light weight, low thermal conductivity, high temperature and chemical resistance. 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. See EPA’s About PDF page to learn more. Two major raw materials are usedin the production of polyiso insulation: polyisocyanates and polyols. The insulating core of a polyurethane panel is rigid polyurethane foam (PUR or PU). Polyisocyanurate, polyiso-180-290: 120: 250: Polystyrene-50-60: 75: 165: Polyurethane-210-350: 120: 250: Vermiculite-272-459: 760: 1400: Calcium Silicate Insulation. ISO-CF/HT is suitable for higher temperatures up to 350°F continuous and 375°F intermittent. Incidental contact between solvents and polyiso will cause little or no damage to the foam. Perhaps the biggest improvement polyiso offers over urethanes is the dimensional stability. Polyisocyanurate and polyurethane are two materials that are commonly used to create foam board insulation. The fact is that the differences are considerable. By comparison polyurethane indices are normally around 100. 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. POLYISOCYANURATE VS. POLYURETHANE PROPERTIES A. 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]. Polyurethane will degrade and fall apart in sunlight unless ultraviolet inhibitors are used in the formulation. In comparison, a typical 1″ insulated glass unit offers an approximate R-value of 2.4. The chemistry of polyiso isbased on a … When laminated into a 1″ thick panel with standard 1/8″ substrates and aluminum skins, the polystyrene panel yields a total R-value of approximately 4.7 while the Polyisocyanurate panel will achieve an R-value of 6.4. Issued: 2015-07-15 . Substitutes in Rigid Polyurethane and Polyisocyanurate Laminated Boardstock. Markets & Industries Polyiso and Rigid Foam Insulation Polyisocyanurate boards (also known as PIR or polyiso) and rigid polyurethane foam are highly durable and best-in-class options for thermal insulation in the construction industry and in appliances. Unlike other types of urethane boards, these boards contain a gas that has a low conductivity level within closed cells on the board. Polyisocyanurate (PIR) is one of the most efficient insulation material used in construction. The chemistry of ISO-CF® and ISO-CF/HT polyisocyanurate, on the other hand, is based on a modification of the traditional polyurethane formulations. This factor also proves advantageous during the handling and installation of polyiso. In 1954, the accidental introduction of water resulted in rigid polyurethane (PUR). Dyplast’s ISO-C1 family of polyisocyanurate insulants have a minimum density of 2.0 lb/ft3 and do not exhibit deterioration of thermal conductivity at greater thicknesses. Rigid foam cores under the general category “polyurethane” can be made with quite different formulations and therefore quite different physical properties and performance characteristics. But the high index nature of polyiso foams resists this burning. 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. Polyurethane (PUR and PU) is a polymer composed of organic units joined by carbamate (urethane) links. dans le PIR3. The chemistry of ISO-C1 and ISO-HT polyisocyanurate (polyiso or PIR) is basedon a modification of the traditional polyurethane formulations. Polyisocyanurate ("polyiso") and polyurethane are very similar, closed-cell foam insulation materials. This isocyanurate polymer has a relatively strong molecular structure, because of the combination of strong chemical bonds, the ring structure of isocyanurate and high cross link density, each contributing to the greater stiffness than found in comparable polyurethanes. Energy lost through walls, roofs and windows is the largest single waste Text is available under the Creative Commons Attribution/Share-Alike License; additional terms may apply. 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. Is rigid polyurethane foam ( PUR ) 2 stable at varying climatic conditions both open and cell. 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