PMMA Disk

PMMA Disk, made of polymethyl methacrylate, offers outstanding optical clarity, excellent weatherability, and good impact resistance in a precisely machined circular geometry. Its lightweight nature and transparency make it indispensable in optics, electronics, and biomedical engineering. Applications include optical lenses, display covers, and diagnostic equipment where consistent optical transmission is required. Industries also employ PMMA disks in sensors, light guides, and laser systems. Research uses include polymer optics studies, optical coatings, and biomedical device prototyping. The disk format ensures uniformity in testing and integration into optical or rotational systems. With its combination of transparency, durability, and machinability, PMMA disks remain vital in advancing photonics, medical diagnostics, and lightweight structural systems.

Quick Links:

Tolerance

Properties

Reference & Citations

each

Tolerances

Disc

Thickness		±20%

Material Properties for Polymers

Physical Properties

Element	Value
Abbe number	57.2
Flammability	HB
Radiation resistance	Fair
Refractive index	1.49
Resistance to Ultra-violet	Good
Limiting oxygen index( % )	17-20
Water absorption - over 24 hours( % )	0.2
Density( gcm⁻³ )	1.19

Chemical Resistance

Element	Value
Acids - concentrated	Good-Poor
Acids - dilute	Good-Poor
Alcohols	Good-Poor
Alkalis	Good
Aromatic hydrocarbons	Poor
Greases and Oils	Good
Halogenated Hydrocarbons	Poor
Halogens	Poor
Ketones	Poor

Electrical Properties

Element	Value
Dielectric constant @1MHz	2.6
Dissipation factor @ 1MHz	0.014
Dielectric strength( kV mm⁻¹ )	15
Surface resistivity( Ohm/sq )	10¹⁴
Volume resistivity( Ohmcm )	2-14 x 10¹⁵

Mechanical Properties

Element	Value
Hardness - Rockwell	M92-100
Poisson's ratio	0.35-0.4
Elongation at break( % )	2.5-4
Tensile modulus( GPa )	2.4-3.3
Izod impact strength( J m⁻¹ )	16-32
Tensile strength( MPa )	80

Thermal Properties

Element	Value
Heat-deflection temperature - 0.45MPa( C )	105
Heat-deflection temperature - 1.8MPa( C )	95
Lower working temperature( C )	-40
Upper working temperature( C )	50-90
Specific heat( J K⁻¹ kg⁻¹ )	1400-1500
Thermal conductivity( W m⁻¹ K⁻¹ )	0.17-0.19@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	70-77