Table 3.

Physical and thermal properties of the PMMA.

Material properties	ACREPT VH001
Young’s modulus E (E∞) (MPa)	3.29 × 102 (3.3 × 102)
Poisson’s ratio v	0.32
Brewster’s constant	4.6
Coefficient of thermal expansion α (1/℃)	7.07*E−5
Compressibility β (cm2/kg)	3.56
Solid-state densities ρ0 (g/cm3)	1.178421
Melt density densities ρ1 (g/cm3)	1.04
Transition temperature Tg (℃)	105