Vitrex EYE PROTECTION User Manual
Page 2
Low and medium energy oculars are impact resistant but not unbreakable. Clean and inspect regularity. Pitted or scratched
lenses reduce vision and seriously reduce protection – replace immediately. Some impact resistant eye protectors will
facilitate the wearing of prescription spectacles under them. However in certain cases these eye protectors may transmit
impacts to the eyewear enclosed and therefore may be reduced.
Shade numbers of filters to be used during gas welding & brazing
Flow rate q
of acetylene
Type of operation
Welding &
brazing of heavy
metals
Welding with
emmissive fluxes (notably light alloys)
(L/H)
q<70
4
4F
70<q<200
5
5F
200<q<800
6
6F
800<q
7
7F
Note 1. According to the conditions of use, the next greater or the next smaller
shade number can be used.
Note 2. The term heavy metal applies to steels, alloy steels, copper and its alloys
etc.