|
TECHNICAL
DATA
The eye - a natural high precision optical
instrument. Nearly 90% of all sensations
are perceived by the human eye. That is why
the consequences of eye damage are
especially severe.
During all welding and cutting operations a
harmful optical radiation is emitted. The
intensity of this radiation depends on the
welding processes used and the melting
temperatures. The correct selection and the
appropriate use of the welding filter
eliminate eye damage and reduction of the
visual acuity.
|
Types of
optical radiation and possible
effects on the function of the eye |
|
Optical
radiation during welding |
to the
eye |
direct
effects on the eye |
indirect
effects on the eye |
|
ultraviolet radiation |
invisible |
absorption of radiation by the
cornea |
painful
corneal inflammation of keratitis
and conjunctivitis |
|
visible
radiation (light) |
visible |
high
radiant intensity glare |
temporary reduction of the visual
acuity |
|
infrared
radiation |
invisible |
heating
of the aqueous humor and the lens,
lenticular opacity, burning of the
retina |
permanent reduction of the visual
acuity leading to cataract |
|
This
lens is a green in color. The
spectral response of this glass
shows excellent ultraviolet and
infrared protection. The visible
light transmission will depend
on the chosen shade. The higher
the number the darker the
glasses.
ANSI Z87.1 Table 1
Transimittance Requirements
for Clear Lenses and General
Purpose Filters
|
Shade Number |
Luminous
Transmittance |
Maximum
Effective Far
UltraViolet
Average
Transmittance |
Maximum InfraRed
Average
Transmittance |
|
|
|
Maximum |
Nominal |
Minimum |
|
|
|
Clear |
100% |
- |
85% |
- |
- |
|
1.5 |
67% |
61.5% |
55% |
0.1% |
25% |
|
1.7 |
55% |
50.1% |
43% |
0.1% |
20% |
|
2.0 |
43% |
37.3% |
29% |
0.1% |
15% |
|
2.5 |
29% |
22.8% |
18.0% |
0.1% |
12% |
|
3.0 |
18% |
13.9% |
8.50% |
0.07% |
9% |
|
4 |
8.50% |
5.18% |
3.16% |
0.04% |
5% |
|
5 |
3.16% |
1.93% |
1.18% |
0.02% |
2.5% |
|
6 |
1.18% |
0.72% |
0.44% |
0.01% |
1.5% |
|
7 |
0.44% |
0.27% |
0.164% |
0.007% |
1.3% |
|
8 |
0.164% |
0.100% |
0.061% |
0.004% |
1.0% |
|
9 |
0.061% |
0.037% |
0.023% |
0.002% |
0.8% |
|
10 |
0.023% |
0.0139% |
0.0085% |
0.001% |
0.6% |
|
11 |
0.0085% |
0.0052% |
0.0032% |
0.0007% |
0.5% |
|
12 |
0.0032% |
0.0019% |
0.0012% |
0.0004% |
0.5% |
|
13 |
0.0012% |
0.00072% |
0.00044% |
0.0002% |
0.4% |
|
14 |
0.00044% |
0.00027% |
0.00016% |
0.0001% |
0.3% |
|
|
|