You asked, and we answered! This lens is the latest in our catalog for the best protection against infrared radiation.
The lens consists of a base of our exclusive Blue Didymium™ filter with an upper section of Green Welding (Shade 3, 4, 5, or 6), and a lower section of Green Welding (shade 4, 5, 6, or 8). You may have your lenses made half and half or one third/two thirds. The shades in standard configuration are light on top and dark on the bottom. The reversed configuration (custom made, not returnable) is dark on top and light on the bottom. Your choice.
The available shade configurations are:
This filter is particularly valuable for use in fuming and other tasks where the brightness of the flame is a problem. It will also lend itself to most borosilicate glass work where larger sculptural work is done. By tipping your head you can change the shade number you are viewing through as the brightness of the glass changes.
The AGW-286 filter is available only in non-prescription, and single vision prescription forms only. Because of the laminations involved, we cannot make this filter in bifocals, trifocals or progressive forms.
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.
Protected under United States Patent Number 6,612,697.
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: 4.0 %
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