All of the following are true about property of polymethyl methacrylate except:
KHN 18-20
chemical stable if heated till 260 degree F
Modulous of elasticity is 2.4 Gpa.
Tensile strength 29Mpa.
It is a hard resin with a Knoop hardness number of la to 20 KHN.
It has a tensile strength approximately 60 MPa a density of 1.19 g/ cm3, and a modulus of elasticity of approximately 2.4 GPa.
It is chemically stable to heat below 125°C (About 260°F), softens at 125°C, and can be molded as a thermoplastic material.