Specially formulated for airless
spray application to shot or grit-blasted steel, Epoxy Protective
Primer is an economic method of protecting the blast cleaned surface
for limited periods prior to the application of the full protective
coating system. It may be over coated with most types of protective
coatings including those based on chlorinated rubber, vinyl or epoxy
resins, but should not be used beneath inorganic silicate coatings.
Prior to shop fabrication, or when used as a transit primer, its rapid
drying allows handling within a few hours of application and it is
valuable in site blasting of large areas e.g. storage tanks, where
it used to protect areas of blasting within the specified re-coating
period, and then allows work to proceed in adjacent areas without
the danger of damage, which would occur with slower drying Primers.
It is less suitable for automatic blasting plants, unless very efficient
heating is available. In projects where steelwork is likely to be
left exposed for long periods without final coating, the use of Zinc
Rich Epoxy Primer is recommended.
PHYSICAL CHARACTERISTICS
OF WET PAINT
Pigment
composition
Red oxide, mineral
extenders
Pigment
%
42 ± 2
Binder
type
Epoxy resin/polyamide
Binder %
20 ± 2
Thinner
composition
Aromatic hydrocarbon/glycol
ethers
Thinner%
38 ± 2
Volume
solids%
37 ± 2
Specific
gravity of paint
1.35 ± 0.03
Base: Activator
ratio by volume
5 : 1
Pot life
at 30º C maximum
8 hours
at 20º C
24 hours
at 7º C
48 hours
PHYSICAL CHARACTERISTICS
OF DRY FILM
Drying
time of standard
at 30º C
1 hour
at 20º C
2 hours
at 7º C
3 hours
N.B. - Epoxy
curing
The curing of Epoxy resin-based
coatings is temperature dependent. It is seriously retarded
below 5ºC (41º F)
Recoating
time
Minimum
Maximum
at 30º C
3 hours
at 20º C
4 hours
1 month
at 7º C
6 hours
Standard
thickness
Wet paint:
47-65 microns (2 - 2 ½
Mils)
Dry film:
18-25 microns (3/4 - 1 Mil)
Theoretical
coverage on smooth surfaces
15.6-22.05 m² /Litre (87-120
sq. yds/imp,gln. Or (11.61-16.12 m² /kg) *If not recoated
within 1 month, under severe conditions, blasting and repriming
of localized areas of breakdown may be necessary.
APPLICATION
Brush/roller
Not recommended
Conventional
spray
Thinner addition
by volume
5-10%
Recommended
thinner
Epoxy Thinner
SURFACE PREPARATION
Blast clean to BS 4232:1967
'Second Quality' (Swedish Standard SA 2 ½) or SSPC SP9 minimum,
Prime immediately after blasting. If this is impracticable blasting
and priming must both be completed within the same working day and
before the standard of blasting has deteriorated.
