Safety specs

Question 1

What year was the Health and Safety at Work legislation brought in?

Answer 1

1993

Question 2

Which regulations within the Health and Safety at Work legislation is eye protection in?

Answer 2

PPE

Question 3

What does housing mean?

Answer 3

Frames

Question 4

What does oculars mean?

Answer 4

Lenses

Question 5

What are the types of protective eyewear?

Answer 5

Afocal one-piece (wrap around)
Box type goggles
Cup type goggles
Face shields/visors
Safety specs

Question 6

What are the features of afocal one-piece protectors?

Answer 6

One size
No rx
Polycarb

Question 7

What are the features of box type goggles?

Answer 7

Afocal (no rx)
Oculars polycarb or cellulose acetate
Housing PVC

Question 8

What are the features of cup type goggles?

Answer 8

Enclose each eye individually
Uncomfortable

Question 9

What are face shields/visors useful for?

Answer 9

Protecting against splashes and flying particles

Question 10

What is the housing of safety specs normally made from?

Answer 10

Plastic: cellulose acetate, polyamide or polycarb
Metal: Plated nickel alloy

Question 11

What are the requirements for side shields on safety specs?

Answer 11

Transparent
Vented
Usually polycarb

Question 12

For testing safety specs, what height is the ball dropped from?

Answer 12

1.3m

Question 13

What does the S marking mean?

Answer 13

Increased robustness

Question 14

For the S marking (increased robustness), what is the specification of the ball used in testing oculars?

Answer 14

22mm diameter
Steel
43g
5.1m/s

Question 15

For the S marking (increased robustness), what is the specification of the ball used in testing housing?

Answer 15

6mm diameter
Steel
0.86g
12m/s

Question 16

What does the F marking mean?

Answer 16

Low energy impact

Question 17

For the F marking (low energy impact), what is the specification of the ball used in testing?

Answer 17

6mm diameter
Steel
0.86g
45m/s

Question 18

What does the B marking mean?

Answer 18

Medium energy impact

Question 19

For the B marking (medium energy impact), what is the specification of the ball used in testing?

Answer 19

6mm diameter
Steel
0.86g
120m/s

Question 20

What does the A marking mean?

Answer 20

High energy impact

Question 21

For the A marking (high energy impact), what is the specification of the ball used in testing oculars?

Answer 21

6mm
Steel
0.86g
190m/s

Question 22

What markings must be engraved on a safety spec lens?

Answer 22

Manufacturer identification
Optical class (level of wear)
Certification mark (CE/UKCA)

Question 23

What are the optional engravings on a lens of a safety spec?

Answer 23

Scale numbers
Mechanical strength symbol
Field of use
Kitemark

Question 24

What are the optical classes?

Answer 24

1: continuous
2: occasional
3: intermittent

Question 25

What markings must be on the housing?

Answer 25

Manufacturer’s mark EN 166 Impact grade (F, B or A) CE/UKCA mark

Question 26

What plastic lens materials can be used for safety specs?

Answer 26

Polycarbonate Trivex CR39

Question 27

What are the features of polycarbonate lenses (for safety specs)?

Answer 27

Highest impact resistance Low Abbé number (colour fringing)

Question 28

What are the features of CR39 lenses (for safety specs)?

Answer 28

Better impact resistance than PMMA (used originally for safety specs)

Question 29

What are the glass materials that can be used for safety specs lenses?

Answer 29

Heat toughened glass Chemically toughened glass

Question 30

What are the features of heat toughened glass?

Answer 30

Breaks into blunt, cube shaped pieces

Question 31

What are the features of chemically toughened glass?

Answer 31

Breaks in radial fracture pattern with concentric cracks

Question 32

Can repairs be done on safety specs by anyone other than the manufacturer?

Answer 32

No

Question 33

What are the field of use markings?

Answer 33

No symbol 3 4 5 8 9 G K N

Question 34

What does the field of use marking 3 mean?

Answer 34

liquids

Question 35

What does the field of use marking 4 mean?

Answer 35

large dust particles

Question 36

What does the field of use marking 5 mean?

Answer 36

gas/fine dust particles

Question 37

What does the field of use marking 8 mean?

Answer 37

short circuit/electric arc

Question 38

What does the field of use marking 9 mean?

Answer 38

molten metal/hot solids

Question 39

What does the field of use marking G mean?

Answer 39

resistant to radiant heat

Question 40

What does the field of use marking K mean?

Answer 40

resistant to fine dust particles

Question 41

What does the field of use marking N mean?

Answer 41

non-fogging properties

Question 42

What does no field of use marking mean?

Answer 42

general purpose