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Butyrate Typical Technical Data Mechanical Properties Tensile Stress @ Yield   D 638  33.1 MPa (4800 psi) Tensile Stress @ Break   D 638  43.4 MPa (6300 psi) Elongation @ Break   D 638  50% Flexural Modulus   D 790  1379 MPa (2.00  x 105 psi ) Flexural Yield Strength   D 790  45.5 MPa (6600 psi) Rockwell Hardness, R Scale   D 785  78  Izod Impact Strength, Notched   @ 23°C (73°F) D 256  240 J/m (4.5 ft·lbf/in.)   @ -40°C (-40°F) D 256  96 J/m (1.8 ft·lbf/in.)   Thermal Properties Deflection Temperatured   @ 1.82 MPa (264 psi) D 648  74°C (165°F)   @ 0.455 MPa (66 psi) D 648  85°C (185°F) Vicat Softening Temperatured   D 1525  104°C (219°F)   Permanence Properties Water Absorption, 24 h immersion   D 570  1.4% Soluble Matter Loss   D 570  0.1% Weight Loss on Heating [72 hours @ 80°C (176°F)]  D 707  0.5%   Miscellaneous Butyrate Properties Refractive Index, nD   D 542  1.46-1.49  Light Transmissione   E 308  >90% Hazee   D 1003  <8.5% Specific Heat @ 23°C (73°F)  DSC  1.26-1.67 kJ/kg·K (0.301-0.399 Btu/lb·°F) Thermal Conductivity   C 177  0.17-0.33 W/m·K (1.2-2.3  Btu·in./h·ft2·°F ) Coefficient of Linear Thermal Expansion   D 696  11 - 17 x 10-5 /°C (mm/mm·°C) ( 6 - 9 x 10-5 /°F (in./in.·°F)) Mold Shrinkage   D 955  0.2-0.6% Dielectric Strength   D 149  11.8-18.7 kV/mm (300-475 V/mil) Dielectric Constant 1 MHz  D 150  3.3-3.8  Dissipation Factor 1 MHz  D 150  0.01-0.15  Volume Resistivity   D 257  1013 - 1015 ohm·cm

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