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, 8, or 10 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 5 mm thick. Single vision prescription adds at least 1 mm, bifocal prescription adds at least 2 mm. Shade 10 filters are 7 mm thick.
Due to the extreme darkness of the filters, Shade 8 and 10 are available only in non-prescription form.
Shade 8 and 10 are Custom Made and Not Returnable except for manufacturing defects.
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