MEAM.Design - Materials - Polymethyl Methacrylate (PMMA, Acrylic, Plexiglass)

Instron Testing Video and Data

Tension Testing (mov) - Excel Data

Material Properties

Density 1.16 g/cc
UTS 7 (11.5 compression) kpsi
Hardness - -
Glass transition 105 C
Melting 135 C
Boiling 200 C
Ignite 460 C
Price point (clear cast) $3.35 3/4" x 12" cast round, smallparts ZCAR-08-12
Price point (fluorescent) $12.49 3/4" x 12" cast round, mcmaster 84925K216
Recycle NO


PMMA was first marketed in 1933

It takes 2 kg of petroleum to produce 1kg of PMMA


92-98% light transmission (rivals glass at 1/2 the weight)

Outstanding weatherability

Poor reactivity

Shatter/impact resistant, but brittle


Can be used for light redirection (cast has better light properties than molded/extruded)

In MEAM, we use acrylic for just about everything!


Injection, compression, extrusion molding

Join using cyanoacrylate (superglue), heating, or trichloromethane (dissolves plastic at joint)

Scratches removable by heating

Laser cuts beautifully

Post-maching can polish to high clarity