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3" Diameter, Optical Cast Plastic IR Longpass Filter

Stock #43-950
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Qty 1-49
Qty 50+
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Diameter (mm):
Density (g/cm3):
1.320 at 20°C
Diameter (inches):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Thermoset ADC (CR-39®)
Operating Temperature (°C):
100 Continuous, 130 One Hour Max
Index of Refraction nd:
1.501 @ 20°C
Thickness (mm):
1.50 Nominal
Transmission (%):
>90 (typical)
Longpass Filter
Dimensional Tolerance (mm):
Abbe Number (vd):

Regulatory Compliance

RoHS 2015:
Reach 223:

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Product Family Description

  • Lightweight Plastic
  • Excellent Thermal and Chemical Resistance

These plastic filters are ideal for blocking visible light, while passing near infrared wavelengths. New plastic technology has produced filters with properties that can satisfy a variety of optical and environmental needs, yet at half the weight of glass filters. Compared to similarly available transparent plastics, Thermoset ADC filters have the highest transmission and lowest haze, have at least 25-50 times greater abrasion resistance, and are resistant to all types of chemicals and solvents (acetone, acids, alkali and alcohols). In addition to having excellent thermal characteristics, they are resistant to pits from hot sparks resulting from welding or grinding processes. The filters can also be easily drilled with high-speed carbide bits for all types of mounting.

Technical Information

Compatible Mounts

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75.0/76.2mm Optic Dia., Optical Cell Assembly Fixed #36-466 $176.00
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5.0 - 100.0mm Optic Dia., Self-Centering Jaw Clamp Fixed #16-078 $356.00
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75.0/76.2mm Optic Dia., Optical Cell Kinematic Mount Adjustable - Tip-Tilt #53-965 $496.00
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