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Fastening VYCOM Expansion / Contraction Worksheet The following worksheet will help calculate the correct size to cut an HDPE part in order to allow for potential expansion and contraction after installation. Contraction A = ___________°F. What is the approximate temperature at the time of fabrication B = ___________°F. What is the lowest temperature your part will experience in the place of services? Subtract B from A This gives you the temperature difference for shrinkage due to cold. Expansion A = ___________°F. What is the approximate temperature at the time of fabrication? B = ___________°F. What is the highest temperature your part will experience in the place of service? Subtract A from B This gives you the temperature difference for expansion due to heat Let’s call the difference “D”. D = _________°F. To calculate the total amount of expansion or contraction, multiply the following; ___D___ °F x ___L or W ___ inches x _.00006 = E or C inches D = temp difference L or W = length or width of part .0006 = coefficient of HDPE expansion E or C — amount of expansion or contraction Example: If an HDPE part were being cut in a shop at 70°F and the highest temperature the part will experience is 100°F, the Temperature Difference (D) is 30. The part is 96 inches, so the expansion is: 30°F x 96” x .0006 = .173” or approximately 3/16” (temp diff) x (length of part) x (coefficient) = expansion Thus at 100°F the part will be 96.173” Conversion Chart: Fractional Inches to Decimal Inches 1/32” 0.031” 1/16” 0.062” 3/32” 0.094” 1/8” 0.125” 5/32” 0.156” 3/16” 0.188” 7/32” 0.219” 1/4” 0.250” 9/32” 0.281” 5/16” 0.313” 11/32” 0.344” 3/8” 0.375” 13/32” 0.406” 7/16” 0.438” 15/32” 0.469” 1/2” 0.500” 17/32” 0.531” 9/16” 0.563” 19/32” 0.594” 5/8” 0.625” 21/32” 0.656” 11/16” 0.688” 23/32” 0.719” 3/4” 0.750” 25/32” 0.781” 13/16” 0.813” 27/32” 0.844” 7/8” 0.875” 29/32” 0.906” 15/16” 0.938” 31/32” 0.969” 1” 1.00” Chapter 3 Copyright 2013 Vycom 17PDF Image | FABRICATION MANUAL HDPE
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