Which statement about polymethyl methacrylate (PMMA) is incorrect?

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Knoop hardness value ranges between 18 and 20It has a tensile strength of approximately 60 MPaIts density measures around 1.13 grams per cubic centimeterThe elastic modulus is about 3.4 gigapascals

Explanation

Polymethyl methacrylate typically exhibits a Knoop hardness number between 18 and 20, a tensile strength near 60 MPa, and a density close to 1.13 g/cm³. However, its modulus of elasticity is not 3.4 GPa, making option D the incorrect statement.