These products are known as near infrared cut-on filters or long wavelength band-pass filters. They are designed to block UV and visible light while transmitting NIR light.
Epolin offers dye powders and thermoplastic compounds with VOIRT properties.
Epolight VOIRT dyes for thermoplastic compounding
Epolight VOIRT dyes for solvent based systems
Luminate VOIRT ready-to-mold compounds
Explore the difference between the visible and and near infrared spectrum by clicking below.