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OCR: Technical Aspects Technical Assumptions for the Eco-efficiency Analvsis R-value Density Yield Ib/ft3 board-ft/lbs Spray polyurethane foam {SPF] Extruded polystyrene {XPS} n/a Expanded polystyrene n/a {EPS] Polvisocyanurate These values may vary slightly. depend zua upon grade material and manufacturer Typical values were chosen for the Eco- -efficiency Analysis described in this course Poly iso reflect ong- -term thermal resistance (LTTR) 23 dependent long