PMMA (Acrylic)

PMMA (Polymethyl Methacrylate), universally known as Acrylic or by the brand names Plexiglas®
and Perspex®, is an amorphous transparent thermoplastic that offers optical clarity rivaling glass at roughly half the weight. With light transmission up to 92% and excellent UV stability, PMMA is the material of choice for optical lenses, display screens, signage, and architectural glazing where glass weight or safety is a concern. Beyond its optical excellence, PMMA machines beautifully to tight tolerances, bonds readily with solvent cements, and provides a hard, scratch-resistant surface — making it equally valuable for precision mechanical prototypes and industrial transparent covers.

Mechanical Properties

• Density: 1.19 g/cm³
• Tensile Strength: 72 MPa
• Yield Strength: 65 MPa
• Elongation at Break: 5–10%
• Flexural Modulus: 3,200 MPa
• Hardness (Rockwell): R 100 (M scale: M85)
• Heat Deflection Temperature: 95°C @ 1.8 MPa
• Melting Point (Softening Point): 160°C
• Thermal Conductivity: 0.19 W/m·K
• Coefficient of Thermal Expansion: 7.0 × 10⁻⁵ /°C
• Water Absorption: 0.3%
• Flammability Rating: HB (UL94); flame-retardant grades available in V-0

Advantages

🟢  Exceptional optical clarity — light transmission up to 92% with excellent transparency and color stability over time

🟢  Superior UV resistance compared to other transparent plastics; does not yellow significantly even after years of outdoor exposure

🟢  Outstanding surface hardness (harder than most plastics); good scratch resistance suitable for display and lens applications

🟢  Excellent weatherability — maintains mechanical properties and appearance in outdoor environments for decades

🟢  Easy to fabricate and machine to tight tolerances; can be drilled, milled, turned, laser cut, and polished to optical finishes

🟢  Bonds readily with solvent cements (e.g., dichloromethane) for strong, transparent joins — no mechanical fasteners needed

Machining & Manufacturing

Common Applications