Safety specs Flashcards
What year was the Health and Safety at Work legislation brought in?
1993
Which regulations within the Health and Safety at Work legislation is eye protection in?
PPE
What does housing mean?
Frames
What does oculars mean?
Lenses
What are the types of protective eyewear?
Afocal one-piece (wrap around)
Box type goggles
Cup type goggles
Face shields/visors
Safety specs
What are the features of afocal one-piece protectors?
One size
No rx
Polycarb
What are the features of box type goggles?
Afocal (no rx)
Oculars polycarb or cellulose acetate
Housing PVC
What are the features of cup type goggles?
Enclose each eye individually
Uncomfortable
What are face shields/visors useful for?
Protecting against splashes and flying particles
What is the housing of safety specs normally made from?
Plastic: cellulose acetate, polyamide or polycarb
Metal: Plated nickel alloy
What are the requirements for side shields on safety specs?
Transparent
Vented
Usually polycarb
For testing safety specs, what height is the ball dropped from?
1.3m
What does the S marking mean?
Increased robustness
For the S marking (increased robustness), what is the specification of the ball used in testing oculars?
22mm diameter
Steel
43g
5.1m/s
For the S marking (increased robustness), what is the specification of the ball used in testing housing?
6mm diameter
Steel
0.86g
12m/s
What does the F marking mean?
Low energy impact
For the F marking (low energy impact), what is the specification of the ball used in testing?
6mm diameter
Steel
0.86g
45m/s
What does the B marking mean?
Medium energy impact
For the B marking (medium energy impact), what is the specification of the ball used in testing?
6mm diameter
Steel
0.86g
120m/s
What does the A marking mean?
High energy impact
For the A marking (high energy impact), what is the specification of the ball used in testing oculars?
6mm
Steel
0.86g
190m/s
What markings must be engraved on a safety spec lens?
Manufacturer identification
Optical class (level of wear)
Certification mark (CE/UKCA)
What are the optional engravings on a lens of a safety spec?
Scale numbers
Mechanical strength symbol
Field of use
Kitemark
What are the optical classes?
1: continuous
2: occasional
3: intermittent
What markings must be on the housing?
Manufacturer’s mark
EN 166
Impact grade (F, B or A)
CE/UKCA mark
What plastic lens materials can be used for safety specs?
Polycarbonate
Trivex
CR39
What are the features of polycarbonate lenses (for safety specs)?
Highest impact resistance
Low Abbé number (colour fringing)
What are the features of CR39 lenses (for safety specs)?
Better impact resistance than PMMA (used originally for safety specs)
What are the glass materials that can be used for safety specs lenses?
Heat toughened glass
Chemically toughened glass
What are the features of heat toughened glass?
Breaks into blunt, cube shaped pieces
What are the features of chemically toughened glass?
Breaks in radial fracture pattern with concentric cracks
Can repairs be done on safety specs by anyone other than the manufacturer?
No
What are the field of use markings?
No symbol
3
4
5
8
9
G
K
N
What does the field of use marking 3 mean?
liquids
What does the field of use marking 4 mean?
large dust particles
What does the field of use marking 5 mean?
gas/fine dust particles
What does the field of use marking 8 mean?
short circuit/electric arc
What does the field of use marking 9 mean?
molten metal/hot solids
What does the field of use marking G mean?
resistant to radiant heat
What does the field of use marking K mean?
resistant to fine dust particles
What does the field of use marking N mean?
non-fogging properties
What does no field of use marking mean?
general purpose
