7/24/2019 Sb 042 Spray Painting
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SAFETY BULLETIN # 042
HAZARDS IN SPRAY PAINTING
The vapor evolved during the spraying of flammable liquids may
present a serious fireand health hazard unless the process is
controlled. Some finishes, particularly lacquers,may contain up to
80% of volatile solvent which must be removed to allow drying to
taeplace. !f the vapors of certain solvents are allowed to
accumulate even in concentrationsas low as "00 ##$, a toic hazard
may be created. !f the concentration is increased toabout
&0,000 ##$ 'the lower flammable limit for a number of common
solvents( a fire oreven an eplosion may occur if the vapor and air
miture is ignited.
Serious health hazards are associated with the spraying of
two)pac polyurethane paintsand lacquers in which one component
'commonly referred to as the *hardener* or*catalyst*( contains an
isocyanate pre)polymer together with 'usually( small amounts offree
monomeric socyanate. They can present a serious inhalation hazard,
not only from
isocynate vapors, but also from the possibility of inhaling
finely)dispersed aerosol mistdroplets containing active
isocyanate.
when such two)pac systems are being sprayed, the sprayers and
other persons in thevicinity should wear positive pressure air)fed
respiratory equipment.
The spraying of epoy)based paints and undercoats can present a
sin)contact hazardleading to irritation and rash, and suitable
protective clothing should be worn to preventcontact with spray
mist. +utbreas of sin)irritation have occurred at areas remote
fromthe actual spraying, due to drift of the mist produced.
Standards of enclosure andventilation should be provided to inhibit
this.
uidance note -/ S eec.
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