CLAREX 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 light and block/absorb visible light
- Optical-grade cast acrylic
- No birefringence
- Low wavefront distortion
- Excellent resistance to weathering and chemicals
- Available with smooth or anti-glare surface finishes
- Available with scratch- and chemical-resistant coatings
- Available with custom-tuned anti-reflective coating
Common NIR Filter Applications
- Instrumentation
- Sensors
- Communications and optical devices
- LIDAR filters
- Machine vision
- Time of flight sensors
- Covert imaging and illumination
Thicknesses
- 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
- 400mm x 550mm standard
- Custom sizes available upon request
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.
Physical & Chemical Properties of CLAREX Near-Infrared (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 |