3M Speedglas 9002NC Gebrauchsanweisung Seite 74

G:1
Transmittance (%)
20
18
16
14
12
10
8
6
4
2
0
UV
(ultraviolet) radiation
– always blocked
VISIBLE LIGHT
70
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