ISO-HT® Polyisocyanurate Insulation
2.5 lb/ft³ (40 kg/m³) density for Higher Temperature Applications
ISO-HT is Dyplast Products’ 2.5 lb/ft³ polyisocyanurate rigid, closed cell, foam insulation for higher temperature applications up to 350°F (177°C), with intermittent exposure up to 375°F (190°C). ISO-HT is suitable for constant temperature or heat cycling environments. ISO-HT is certified by independent laboratory to meet demanding Class 1 flame spread and smoke development requirements per ASTM E84. ISO-HT fully complies with the demanding requirements of ASTM C591. Dyplast offers ISO-HT as bunstock or as sheets and blocks, with tolerances up to 1/32 inch on surfaces. Our extensive network of fabricators can provide special shapes for pipe, fittings, vessels, or other mechanical applications.
Polyisocyanurate exhibits the highest R-value (insulating value) to thickness ratio of commercially available insulation per unit cost, and ISO-HT provides higher R-values and reduced thermal aging. Ideal for applications over a wide range of temperatures up to 350°F (from cryogenic liquids to low-temperature steam), ISO-HT offers superior performance versus cost when compared to polystyrene, polyurethane, phenolic, fiberglass, aerogel, and cellular glass alternatives. When temperatures are limited to less than 300°F, our ISO-C1 product line is also available in 2, 2.5, 3, 4, and 6 lb/ft³ densities, which each provide successively improved strength and other attributes for physically demanding applications.
Dyplast’s ISO product line is produced as a continuous foam bunstock. For specific bun sizes contact the sales department.
ISO-HT is designed for use where temperatures range from -297°F to +350°F, making it ideal for low-temperature steam applications and refinery liquids, as well as unique commercial and industrial applications that may sometimes operate at higher temperatures up to +375°F intermittent, such as petrochemical, pharmaceutical, and hot water systems.
Water absorption by insulation can degrade thermal insulating performance. ISO-HT’s extraordinary resistance to water absorption (0.27%) helps ensure long-term thermal performance remains superior to polystyrenes, phenolic foams, fiberglass, and cellular glass - - which for example has water absorption of <0.2% (per manufacturer data), but has as well considerably lower insulating value.
NOTE TO SPECIFIER/ENGINEERS AND CONTRACTORS
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SURFACE BURNING CHARACTERISTICS
The International Mechanical Code defines Class 1 insulation as meeting the 25/450 flame spread/smoke development rating. ISO-HT performs well within this range with a <25/350 (at 4”) rating. When comparing surface burning characteristics of alternative products, care must be taken to consider the installed insulation system as a whole, including sprinkler systems. For example, a well-designed ISO-HT insulation system can improve overall flame/smoke performance of the polyiso insulation. On the other hand, an alternative insulation’s flame/smoke ratings may be compromised by the sealants or jacketing often recommended by suppliers. There is also the matter of insulation system integrity during a fire. ISO-HT may be charred by flame, but maintains its integrity and continues to protect the insulated system.
LONG TERM R-VALUE
High thermal insulation effciency is achieved by infusing cells with gases having low thermal conductivity. All such rigid foam insulation (including polyurethane, extruded polystyrene, and polyisocyanurate) thus lose a small amount of their insulating value over time as air displaces insulating gases. ISO-HT’s smaller, stronger cell structure and our proprietary cell-gas formulation work together to impede gas transfer across cell boundaries, thus reducing loss of thermal effciency. At a testpoint of 75°F, the average R-factor of ISO-HT over a 15 year period is comparable to the six-month “aged” R-value. Thicker insulation, vapor barriers, and metal constraints also limit gas diffusion. Current LTTR calculation standards are primarily applicable to “faced” polyiso board, and are not appropriate for ISO-HT bunstock.
ISO-HT is designed for constant temperature exposure up to 350°F continuous and 375°F intermittent. ISO-HT should be installed on pipe at ambient temperature. Installation onto high temperature or live steam lines is discouraged, since this will cause dimensional stability problems. ISO-HT can be used with an appropriate ASJ or Metal Jacket. Refer to Dyplast's Installation Guides.