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FAQ’s Select from the topics listed below. Working with Urethane Millwork Storage and Installation Properties of Polyurethane vs. Wood   Polyurethane Wood Specific Gravity, g/ml 0.1 – 0.6 0.31 – 0.66 (Wood) Working Qualities Very Good Very Good Nailability Very Good Excellent Screw-Holding Power Very Good Very Good       Effects of Chemicals:     Water Absorption % (24hrs.) 0.2 – 0.7 Over 15% Resistance to Polar Solvents Very Good Very Good Resistance to Dilute Acids Very Good Good Resistance to Dilute Alkali Very Good Good       Thermal Properties:     Thermal Expansion per C (10-5) 3 – 5 110 – 15, 17 – 120 Resistance tp Long Term Exposure Excellent Poor       Physical Properties:     Tensile Strength, psi 100 – 8,000 200 – 1,200 Fatigue Resistance Very Good Excellent Scratch and Wear Resistnace Very Good Good Impact Resistance Good Very Good       Other Properties:     Decay Resistance Excellent Poor Resistance to Insects Excellent Poor – Fair Source:  Elastromer Chemicals Dept. E.1. Dupont

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