Acrylic Longpass Filters

Acrylic Longpass filters are a durable, lightweight and economical solution for inspection windows. They can protect a lens in environments where broken glass might pose a problem.

With a high transmission ranging from 90 to 98% and an anti-reflection coating for maximum transmission, these filters are made from impact-resistant, optical-grade acrylic and are half the weight of glass filters.

Acrylic Filters are available in Threaded Mounts, sizes M13.25 to M105, and in Slip Mounts. Acrylic Filters can be precision laser-cut to a desired size or configuration.

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Common Applications

Inspection windows

Protect camera lenses and imaging areas where broken glass may pose a problem.

Outdoor enclosures

Frequently used as enclosure windows for outdoor vision applications.

Light source filtering

Used over broad spectrum light sources to control wavelength emission.

Regulated environments

Commonly used where glass over the inspection area may not be permitted.

Key Benefits

Lightweight

Half the weight of equivalent glass filters.

Durable

Impact-resistant acrylic construction for demanding inspection environments.

High transmission

High transmission ranging from 90 to 98% with anti-reflection coating.

Customisable

Can be precision laser-cut to a desired size or configuration.

Filter Models

AC380 Protective Window AC685 Acrylic NIR Longpass AC760 Acrylic NIR Longpass

Specification	Details
AC380 A/R Protective Window Used where the lens needs to be protected or in regulated applications where glass filters are prohibited
AC380 is an abrasion, scratch, breakage and solvent resistant acrylic protective window made to withstand harsh environments. These filters are half the weight of glass windows and are 50 times more scratch resistant and impervious to solvents and chemicals including acetone and MEK. This filter blocks almost all UV light while averaging greater than 98% transmission in the 450-700nm visible spectrum. Available from stock in 2mm and 3mm thicknesses as well as custom sized options.
Useful Range	450-850nm
Cut-on Wavelength 50% T	380nm
Tolerance	+/- 10nm
Peak Transmission	≥ 95%
Surface Quality	40/20
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Specification	Details
AC685 Acrylic NIR Longpass Filter Ensuring that mainly IR light reaches the object
The AC685 IR Pass/Visible Block filter material is a 2mm thick acrylic sheet with carefully-controlled near-IR spectral properties. It can be laser cut according to customer specifications and is typically mounted over full spectrum UV/Visible/IR lamp-based lighting to ensure that mainly infrared light reaches the subject while visible light is blocked.
Useful Range	710-1100nm
Cut-on Wavelength 50% T	685nm
Tolerance	+/- 10nm
Peak Transmission	≥ 90%
Surface Quality	80/50
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Specification	Details
AC760 Acrylic NIR Longpass Filter Ensuring that mainly IR light reaches the object while blocking very near IR
AC760 is similar to AC685 except that it also blocks a portion of the very near IR. It is well suited for use with 785nm, 810nm, 830nm or 850nm laser diode or LED illumination, or where visible light emitted by arc/flash lamps needs to be blocked while near-IR illumination is passed. AC760 material is custom cut from a 2mm thick sheet according to customer specifications.
Useful Range	710-1100nm
Cut-on Wavelength 50% T	685nm
Tolerance	+/- 10nm
Peak Transmission	≥ 90%
Surface Quality	80/50
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