{"id":6952,"date":"2012-06-01T00:00:00","date_gmt":"2012-06-01T00:00:00","guid":{"rendered":"https:\/\/insulation.org\/io\/articles\/exploring-insulation-materials-8\/"},"modified":"2017-06-09T20:25:06","modified_gmt":"2017-06-09T20:25:06","slug":"exploring-insulation-materials-8","status":"publish","type":"articles","link":"https:\/\/insulation.org\/io\/articles\/exploring-insulation-materials-8\/","title":{"rendered":"Exploring Insulation Materials"},"content":{"rendered":"

Polyisocyanurate<\/span><\/b><\/p>\n

Polyisocyanurate
\nthermal insulation (PIR) is rigid foam insulation, with a closed cell
\nstructure. It is usually manufactured as large rectangular buns, typically 4 ft
\nwide x 3-24 ft long x 1-2 ft tall, in a range of densities and compressive
\nstrengths. Prior to actual installation, buns are fabricated into various
\nshapes, including flat boards and preformed pipe half-shells 3-4 ft long,
\ndesigned to fit NPS pipe and tubing. Complex shapes can also be fabricated to
\nfit around valves, fittings, and other equipment. ASTM material specification C
\n591 covers PIR at service temperatures from -297\u00b0F to 300\u00b0F. ASTM C 591
\ncontains requirements for density, compressive resistance, thermal
\nconductivity, water absorption, water vapor permeability, dimensional
\nstability, closed cell content, and hot-surface performance. This ASTM
\nspecification lists two grades and six types, with the types identifying the
\nvarious densities noted below. The most commonly used densities are in the
\n2-2.5 lb\/ft\u00b3 range (types IV and II). For comparison purposes, the thermal
\nconductivity of the Grade 2, Types IV and II PIR, is a maximum of 0.20
\nBtu\u0095in\/(hr\u0095ft\u00b2\u0095\u00b0F) at 75\u00b0F. <\/span><\/p>\n

<\/p>\n

<\/a>The two grades, 1 and 2, identify PIR designed for
\ndifferent temperature ranges. Grade 1 has a temperature range of -70\u00b0F to
\n300\u00b0F; while Grade 2 has a temperature range of -297\u00b0F to 300\u00b0F.<\/span><\/p>\n

Key
\napplications for PIR insulation are on pipe, equipment, tanks, and ducts,
\noperating at temperatures below ambient. Examples include commercial chilled
\nwater, refrigeration, and liquefied natural gas lines. It is also used as the
\ncore material in the manufacture of foam core panels for various applications,
\nincluding transportation, building construction, and temporary shelters.<\/span><\/p>\n

\n
<\/a>Figure 1<\/b><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Polyisocyanurate Polyisocyanurate thermal insulation (PIR) is rigid foam insulation, with a closed cell structure. It is usually manufactured as large rectangular buns, typically 4 ft wide x 3-24 ft long x 1-2 ft tall, in a range of densities and compressive strengths. Prior to actual installation, buns are fabricated into various shapes, including flat boards<\/p>\n","protected":false},"author":[],"featured_media":0,"template":"","categories":[],"class_list":["post-6952","articles","type-articles","status-publish","hentry"],"acf":[],"yoast_head":"\nExploring Insulation Materials - Insulation Outlook Magazine<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/insulation.org\/io\/articles\/exploring-insulation-materials-8\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Exploring Insulation Materials\" \/>\n<meta property=\"og:description\" content=\"Polyisocyanurate Polyisocyanurate thermal insulation (PIR) is rigid foam insulation, with a closed cell structure. 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