Near-Infrared (NIR) Filters & Sheets
Optical-grade long-pass NIR filters available in a variety of configurations to meet your needs.
CLAREX acrylic NIR filters are designed to transmit near-infrared (NIR) light while blocking/absorbing visible light. Available in multiple configurations, these filters offer cut-ins ranging from 670nm to 910nm to support a wide range of NIR applications.
For applications where glare or reflections interfere with performance, we offer optional anti-reflective coatings specifically designed for NIR wavelengths.
Standard NIR filters block nearly all visible light, allowing less than 1% transmission. For applications exposed to particularly bright light sources, this may not be sufficient. In those cases, we can adjust the formulation by increasing the density of NIR pigments to further minimize visible light leakage.
Benefits of Near-Infrared (NIR) Bandpass Filters
Transmit NIR & Block Visible Light
Designed to pass near-infrared wavelengths while blocking or absorbing visible light for optical filtering applications.
Optical-Grade Cast Acrylic
Made from high-quality cast acrylic with no birefringence and low wavefront distortion for strong optical performance.
Weather- and Chemical-Resistant
Offers excellent durability in environments where exposure to weathering or chemicals is a concern.
Flexible Surface Finish Options
Available with smooth or anti-glare surface finishes to better match application and viewing requirements.
Optional Hard-Coat Protection
Scratch- and chemical-resistant coatings are available to improve surface durability in demanding environments.
Custom Anti-Reflection Coating Available
Can be supplied with a custom-tuned anti-reflective coating to support specific optical performance goals.
Common NIR Filter Applications
Designed for applications needing to block visible light and transmit NIR.
Instrumentation & Sensors
Used in instruments and sensing systems that rely on near-infrared transmission and reduced visible light interference.
Communications, Optical Devices, & Machine Vision
Supports optical communication systems, machine vision, and other devices that operate in the near-infrared range.
LIDAR Filters & Time of Flight Sensors
Well-suited for LIDAR and ToF systems that use NIR light for detection and distance measurement.
Covert Imaging & Illumination
Helps support covert imaging and illumination systems where visible light suppression is important.
Biometric Sensing
Useful in facial recognition, iris recognition, and other biometric systems that rely on near-infrared illumination and detection.
Surveillance & Security Imaging
A strong fit for imaging systems that use NIR light for low-light or covert observation.
Sample materials may be available to help you evaluate material performance.
THICKNESS OPTIONS
- 0.5mm
- 0.6mm
- 0.7mm
- 0.8mm
- 1.0mm
- 1.2mm
- 1.5mm
- 2.0mm
- 2.5mm
- 3.0mm
- 3.5mm
- 4.0mm
- 4.5mm
- 5.0mm
- Custom
Size Options
- Standard size: 400mm × 550mm
- Custom sizes: Maximum dimensions depend on application. Contact us to discuss available options.
Finished Parts
Sheets can be fabricated and finished to customer specifications
PRODUCT SPECS
NIR Filter Transmission Curves
| TYPE NO. | NEAR-INFRARED TRANSMISSION |
|---|---|
| NIR-70N | Transmit from 670nm |
| NIR-75N | Transmit from 730nm |
| NIR-80N | Transmit from 760nm |
| NIR-85N | Transmit from 810nm |
| NIR-90N | Transmit from 860nm |
| NIR-911N | Transmit from 910nm |
Customization
Custom sheets & parts to meet the needs of your applications.
Build your own sheets! Do you have a unique design requirement which cannot be met with off-the-shelf acrylic sheets? The CLAREX sheets can be fully customized and produced in low volumes up to mass production. Choose the thickness, formulation, additives, color dye/pigments, surface textures, surface coatings, and optical coatings for your custom material configuration, and we can typically have it ready for you in 4-8 weeks. We can even fabricate the finished parts for you.
PRODUCT Properties
Physical & Chemical Properties of CLAREX (NIR) Filters
| PROPERTY | METHOD | UNIT | UNCOATED | WITH HARD COAT |
|---|---|---|---|---|
| Specific Gravity | ASTM D-792 | 1.19 | 1.19 | |
| OPTICAL | ||||
| Refractive Index | ASTM D-542 | 1.49 | 1.49 (1.54) | |
| MECHANICAL | ||||
| Elongation | ASTM D-638 | % | 5 | 5 |
| Tensile Rupture Strength | ASTM D-638 | kg/cm2 | 750 | 650 |
| Flexural Rupture Strength | ASTM D-790 | kg/cm2 | 1200 | 800 |
| THERMAL | ||||
| Heat Distortion Temperature | °C | 108 | 110 | |
| Maximum Recommended Continuous Temperature | °C | 80 | 80 | |
| Available with higher temperature ratings upon request, 90-95 °C | ||||
| DURABILITY | ||||
| Heat Resistance | 80ºC x 100hr | No Change | No Change | |
| Cold Resistance | -40ºC x 100hr | No Change | No Change | |
| Humidity Resistance | 60ºC x 90% x 100hr | No Change | No Change | |
| Thermal Cycle | -40ºC <> 80ºC (10 cycles) | No Change | No Change | |
| ELECTRICAL | ||||
| Surface Resistivity | w | 10^16 | 10^16 | |
| CHEMICAL | ||||
| Methyl Alcohol (50%) | No Change | No Change | ||
| Ethyl Alcohol (50%) | No Change | No Change | ||
| Soap Aqua Solution | No Change | No Change | ||
| Toluene | Dissolved | No Change | ||
| Acetone | Dissolved | No Change | ||
| Benzene | Swollen | No Change | ||
| Ethylene Dichloride | Dissolved | No Change | ||
| OTHER | ||||
| Pencil Hardness | 2H | >6H | ||
| Adhesion | K-5400 | 100/100 | ||
| FLAMMABILITY | ||||
| Fire Resistivity | UL standard | >=0.8mm Thickness | 94HB | 94HB |
Not Sure Which NIR Filter Configuration is Right for Your Application?
Whether you need standard acrylic sheets, custom sizes, optical coatings, or fabricated finished parts, our team can help configure our products to meet your exact requirements.