Optical-Grade Acrylic

Optical-Grade Acrylic

Optical-grade acrylic is a PMMA material manufactured with tighter control over light transmission, haze, internal inclusions, surface defects, and optical distortion. It may be produced by casting or extrusion and is suitable for precision components requiring clear viewing, uniform light guidance, or consistent optical performance.

Appearance & Properties

Color: Colorless and highly transparent; some products may have a slight optical tint

Density: Approx. 1.18–1.20 g/cm³

Tensile Strength: Approx. 60–75 MPa

Light Transmission: Typically up to approximately 92% for clear material

Haze: Generally low, depending on grade and thickness

Weather Resistance: Good

Optical Uniformity: Good to excellent

Machinability: Good, with careful protection of optical surfaces

Bondability: Good

Surface Finishes: Precision mechanical polishing, diamond polishing, optical coatings, hard coating, anti-reflective coating, laser processing, etc.

Typical Applications

Optical-grade acrylic is widely used in optical instruments, scientific equipment, medical diagnostic systems, machine vision, lighting, automotive lamps, and electronic displays.

Typical parts include optical viewing windows, light-guide plates, display covers, prototype lenses, optical alignment plates, inspection-instrument windows, LED optical components, and transparent instrument panels.

Advantages

• High light transmission and low haze

• Approximately half the weight of conventional glass

• Easy to machine into complex profiles, mounting holes, and alignment features

• Suitable for precision polishing and functional optical coatings

• Good weather resistance with limited yellowing under normal outdoor use

Limitations

• Lower surface hardness and scratch resistance than glass

• Machining scratches and edge defects may affect optical performance

• Not suitable for prolonged use near high-temperature light sources

• Precision optical grades cost more than standard clear acrylic

• May not replace optical glass in high-precision imaging applications