lens and frame markings

Question 1

s

Answer 1

increased robustness e.g thickened cr39 or toughened glass

Question 2

f

Answer 2

low energy impact e.g polycarbonate and trivex

Question 3

B

Answer 3

medium energy impact

visors and goggles

Question 4

a

Answer 4

high energy impact - face shields

Question 5

N

Answer 5

non- fogging properties

Question 6

k

Answer 6

resistance to surface damage by fine particles

Question 7

g

Answer 7

radiant heat

face shields only

Question 8

8

Answer 8

short circuit electrical arcs

Question 9

9

Answer 9

non adherence of molten metal and resistance to penetration of hot solids
goggles and face shields

Question 10

protective eyewear N

Answer 10

manufacturer mark

Question 11

protective eyewear 1

Answer 11

optical class

Question 12

protective eyewear s or f

Answer 12

impact grade

Question 13

what does frame markings include

Answer 13

manufacturer 
frame colour/model
horizontal lens size x dbl
total length of side
BS EN - relevant standard
F - if frame meets low energy impact
ce- product meets all legal requirement of European legislation