Insulation Service Temperatures

Polyisocyanurate insulation is used in applications where temperatures call between -297°F (-183°C) and 300°F (149°C). Installation procedures differ for different temperature ranges (and operating conditions), primarily with regard to single versus multiple layers of insulation, the techniques for joining adjacent polyiso segments, and the types of sealants, adhesives, mastics, vapor retarders, and jackets used. Dyplast Products categorizes service temperature ranges into four categories (A - D) that generally define the installation methodologies:

A. Cryogenic Temperatures: -450ºF to -101ºF (-267.8ºC to -73.9ºC), including

• Traditional Cryogenic Temperature Category for Polyiso-based installations: -297°F through -101°F (-183°C through -73.9°C).
• Note: There is a "Special" Polyiso Cryogenic Temperature Category for which Dyplast does not define installation guidelines due to the complexity of design considerations: -450°F through -298°F (-267.8°C through -184°C) [Note: Insulation systems in this range of temperatures require diligent engineering expertise.]

B. Refrigeration/freezer/glycol/brine Temperatures: -100ºF to +31ºF (-73.3ºC to -0.6ºC), including

• Refrigeration/brine: -100°F through -40°F (-73.3°C through -40.0°C).
• Refrigeration/glycol: -39°F through +31°F (-39.4°C through -0.6°C) .

C. Cold or chilled water: +32ºF through Ambient temperatures (0°C through ambient)

D. Ambient to Low-Temperature Steam: Ambient to 300ºF (Ambient to 149ºC), including

• Hot water and steam condensate: Ambient through 211°F (Ambient through 99.4°C)
• High temperature hot water/Low temperature steam: 212°F through 300°F (100°C through 149°C)

E. For Low or Higher-Temperature Steam: +300ºF to 400ºF (149ºC-205ºC) See ISO-HT

Note: These temperature categories are not meant to be definitive. A qualified insulation engineer/designer may define categories differently, depending on the application. Clients should consult professional insulation engineers prior to designing insulation systems for their particular applications.