Division 7 Ebook Page 536 FOAMULARŪ XPS Insulation Resisting Water Absorption (Comparing Types of Rigid Foam Plastic Insulation)

Technical Bulletin FOAMULAR Extruded Polystrene Insulation Resisting Water Absorption, the Key for High Performance Foam Plastic Rigid Insulation water penetration, raising water absorption for the complete board. Comparing Properties: What Do They Mean? Published properties for different types of insulation are not always directly comparable because different test methods may be used to measure the same properties. If different methods are used to measure performance, identify the differences. They may be significant. Water Absorption For example, the material standard that defines properties for all XPS and EPS is ASTM C578. 1 It requires that polystyrene insulation be tested for water absorption in accordance with ASTM C272. 2 C272 requires the polystyrene sample to be immersed in water for 24 hours, and weighed immediately upon removal from immersion to determine the amount of absorbed water. The material standard for polyisocyanurate is ASTM C1289. 3 It requires that polyiso be tested for water absorption in accordance with ASTM C209. 4 C209 requires the polyiso sample to be immersed in water 2 hours, and drained for 10 minutes before weighing for water absorption. Figure 4 shows the significant differences in XPS and polyiso water absorption that result 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Polyiso, Foil Faced Polyiso, Glass Faced XPS, Type X, IV XPS, Type VI, VII, V Polyiso Method, ASTM C 209, 2 Hour Immersed, 10 min. Drain XPS Method, ASTM C 272, 24 Hour Immersed, No Drain % Volume Figure 4 Water Absorption, XPS vs. Polyiso 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 EPS, facer removed EPS w/facer FOAMULAR 250 14 day 7 day 24 hour 2 hour % Volume Figure 5 Water Absorption, XPS vs. EPS

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