IR Transmitting PMMA Film

IR Transmitting PMMA Film enables precise mid-infrared light transmission, supporting applications such as gas spectroscopy, thermal imaging optics, and integrated IR sensors. In research and laboratory instrumentation, it serves as an effective optical window or waveguide material due to its stable transmission between 3–5 µm and 8–12 µm. Its mechanical flexibility and ease of microstructuring allow seamless incorporation into sensor housings, flow cells, and MEMS platforms. The film’s low absorption and consistent refractive index improve signal quality in infrared reflectance or absorption measurements. Suitable for environmental monitoring, biomedical diagnostics, and photonic R&D, it provides a scalable substrate for prototyping compact IR devices and optical assemblies.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Foil

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