The AGW®-250 lens was developed to answer requests for even better infrared radiation protection while also reducing the light level perceived by the eye.
It consists of a base lens of our exclusive Blue Didymium™ with a thin layer of either shade 3, 4, 5, 6 or 8 Green Welding (full coverage) laminated to the base lens. This is very desirable when working with high pressure torches and glass requiring very high temperatures.
Suggested uses are: where there is a need for attenuation of bright illumination, such as that generated when working Pyrex®, quartz, Vicor®, platinum jewelry work, and any operation where long periods of time are spent gazing into a high temperature furnace or fire pit.
Quartz workers must use a minimum Shade 8!
The AGW-250 filter is available in non-prescription (plano power), readers, single vision, and standard flat-top D28 bifocal prescription form.
Thickness Advisory: This filter is thicker than normal lenses. In non-prescription form, it is approximately 4 mm thick. Single vision prescription adds at least 1 mm, bifocal prescription adds at least 2 mm.
Protected under United States Patent Number 6,612,697.
Specifications (Shade 3):
Maximum Visible Light Transmission: 12.4 %
Average (400 to 750 nm) Visible Light Transmission: 5.6 %
Average (751 to 3000 nm) IR Transmission: 4.0 %
ANSI Welding Shade Equivalent: 3.0 approximate
NOTE: Shade 2 and 3 filters are *NOT* designed for advanced techniques such as fuming, or with intensive flare colors without additional filtration.
Specifications (Shade 4):
Maximum Visible Light Transmission: 11.2 %
Average (400 to 750 nm) Visible Light Transmission: 4.9 %
Average (751 to 3000 nm) IR Transmission: 3.4 %
ANSI Welding Shade Equivalent: 3.5 approximate
Specifications (Shade 5):
Maximum Visible Light Transmission: 5.7 %
Average (400 to 750 nm) Visible Light Transmission: 2.1 %
Average (751 to 3000 nm) IR Transmission: 1.5 %
ANSI Welding Shade Equivalent: 4.5 approximate