3M Speedglas 9002NC User Manual page 47

G:1
Transmittance (%)
20
18
16
14
12
10
8
6
4
2
0
UV
(ultraviolet) radiation
– always blocked
VISIBLE LIGHT
45
Light transmission curve
Speedglas welding filters keep the welder
protected from harmful UV and IR radiation.
This protection remains always,in on, off,
dark and light state.
IR
(infrared) radiation
– always blocked