Poly(methyl methacrylate) (PMMA), also known as acrylic or acrylic glass.PMMA is a strong and lightweight material. It has a density of 1.17–1.20 g/cm3 which is less than half that of glass.It also has good impact strength, higher than both glass and polystyrene; however, PMMA’s impact strength is still significantly lower than polycarbonate and some engineered polymers. PMMA ignites at 460 °C (860 °F) and burns, forming carbon dioxide, water, carbon monoxide and low-molecular-weight compounds, including formaldehyde.
PMMA transmits up to 92% of visible light (3 mm thickness), and gives a reflection of about 4% from each of its surfaces due to its refractive index (1.4905 at 589.3 nm).It filters ultraviolet (UV) light at wavelengths below about 300 nm (similar to ordinary window glass). Some manufacturers add coatings or additives to PMMA to improve absorption in the 300–400 nm range. PMMA passes infrared light of up to 2,800 nm and blocks IR of longer wavelengths up to 25,000 nm. Colored PMMA varieties allow specific IR wavelengths to pass while blocking visible light (for remote control or heat sensor applications, for example).
PMMA swells and dissolves in many organic solvents; it also has poor resistance to many other chemicals due to its easily hydrolyzed ester groups. Nevertheless, its environmental stability is superior to most other plastics such as polystyrene and polyethylene, and PMMA is therefore often the material of choice for outdoor applications. Tensile strength decreases with increased water absorption. Its coefficient of thermal expansion is relatively high at (5-10)×10−5 K-1. PMMA has a maximum water absorption ratio of 0.3–0.4% by weight. Tensile strength decreases with increased water absorption.
The common impression of PMMA is transparent and glass like hard plastics. Do you know how the raw material looks like under microscope? EPRUI supplies monodisperse PMMA microspheres which is white powder and with uniform spherical particles under microscope.