★ Basic Characteristics:

Black NIR-transmitting PMMA pellets and sheets

Near Infrared-transmitting acrylic (near infrared transmitting polymethyl methacrylate or near infrared transmitting PMMA)granular material is suitable for injection molding or extrusion, with a density of 1.19 and a refractive index of 1.496.

FLIERMOSUE engineers achieve high transmittance(94%) in the near-infrared (NIR) spectrum (700~1650 nm) while effectively blocking visible light (400~780 nm) and ultraviolet (UV) rays (200~400 nm) through molecular structure modification or additive regulation. This specially engineered PMMA plastic (acrylic material) is referred to as infrared-transmitting acrylic. It exhibits a high-gloss black appearance, high hardness (2H, upgradable to 6H with hardening treatment), excellent scratch resistance, and a high heat deflection temperature (HDT:121°C).

★ Near Infrared-Transmitting Acrylic Raw Material Granules & Sheets

Black NIR-transmitting PMMA Sheet 2400*1200*0.5~8.0 mm

R&D & Manufacturing:

1. Selective Light Transmission & Blocking:
   FLIERMOSUE engineers employ specialized formulations or polymer side-chain adjustments to precisely block visible light and unwanted IR wavelengths while allowing only specified IR wavelengths to pass through.
2. Customizable Wavelength Ranges:
   Custom IR-transmitting acrylic can be tailored to any sub-band within the 700~1650 nm range (e.g., 850~1500 nm, 905~1650 nm) to match different IR LED operating wavelengths for sensors or cameras.

★ Performance of Infrared-Transmitting Acrylic:

1. Optical Properties:

• High transmittance (up to 94%) in the NIR spectrum (700–1650 nm).
• Effective UV blocking, making it suitable for outdoor applications.

1. Mechanical & Thermal Properties:

• High hardness (2H, upgradable to 6H) with scratch resistance.
• Modified versions feature a higher HDT (100~121°C) , making them ideal for automotive applications (e.g., ADAS lenses).

1. Lightweight:

• Density is only 43% that of glass, beneficial for weight reduction.

1. Environmental Stability:

• Resistant to acids, alkalis, and organic solvents (avoid ketones/ethers).
• Flammability (ignition point: 458°C) requires flame-retardant considerations.

★ Core Application Fields:

1. Smart Sensing & Optical Systems:

• ADAS/autonomous driving, LiDAR covers, IR camera lenses (compatible with 905 nm/1550 nm lasers & 850 nm IR).

1. Biometric Recognition:

• IR-transmitting windows for finger vein & iris recognition devices.

1. Security & Surveillance:

• Night-vision camera filters (transmit IR while blocking visible light).

1. Industrial & Consumer Electronics:

• IR touchscreens (allow IR penetration for touch sensing while hiding sensors).

1. Remote Control Devices:

• Black enclosures for IR remote signals (e.g., TV remotes).

1. Specialized Applications:

• Hunting cameras (IR imaging for covert nighttime photography).

1. Medical Devices:

• Optical components for NIR detection instruments.

★ Conclusion

FLIERMOSUE engineers optimize IR-transmitting acrylic through precise wavelength control and performance enhancements, making it an ideal material for IR optical systems in automotive and electronics industries. NIR-transmissive thermoplastic(PMMA M95-1073J) with high transmittance (94% )at 850nm/940nm;Users can select the appropriate grade based on their IR LED wavelength:

• 800 nm or 850 nm IR LEDs → 700~1500 nm range (FLIERMOSUE NIR PMMA M95-1073J)
• 905 nm IR LEDs → 850~1500 nm range (FLIERMOSUE NIR PMMA M95-1085)

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