Dental Which of the following is not true of polymethylmethacrylate? A Knoop hardness number 18 to 20 B Tensile strength of 60 MPa C Density of 1.13 g/cm3 D Modulus of elasticity of 3.4 GPa 💡 Explanation Which of the following is not true of polymethylmethacrylate? ✓ Correct Answer: D. Modulus of elasticity of 3.4 GPa