hempel product data sheets

Shopprimed surfaces:
If HEMPEL’S SHOPPRIMER ZS 15722 or other zinc silicate product is used for
preliminary protection, abrasive sweep intact surface before final coating with GALVOSIL
15780 to remove accumulated dirt and zinc salt and to ensure adhesion.
Application: GALVOSIL 15780 can be applied by conventional spray (pressure pot type), airless
spray or brush.
Equipment:
Conventional Spray: Standard industrial spray equipment with mechanical agitator and
pressure regulators, air filters and water traps.
Air hose: 10 mm (3/8") internal diameter.
Material hose: 13 mm (1/2") internal diameter.
Hoses should be as short as possible, preferably not longer than 10 metres (33").
Pot pressure: 2½-5 bar (37-72 p.s.i.)
Atomization pressure: 1½-2½ bar (22-37 p.s.i.)
Nozzle orifice: 1.8-2.2 mm (.070"-.085")
(Spray-data are indicative and subject to adjustment).
Thinning, if required: max. 50%. (See note below).
When spraying, the pressure pot must be placed at the same, or a higher level than the
gun, due to the weight of the material. Alternatively a piston-pump (e.g. 10:1) may be
used instead of the pressure pot. This will facilitate use of longer hoses or having the
spraygun higher than the pump.
Maintain constant agitation of the mixture until the batch is depleted.
The spray gun should be kept at a maximum distance of 25-30 cm/1 foot from the
surface. Hold the spray gun at a right angle to the surface making even parallel passes
with about 50% overlap. Besides correct spray technique, the amount of thinner added
must be carefully adjusted to secure optimum film formation. The coating must be wet
and smooth just after application.
In case of painting undersides, the spray gun will need intermittent cleaning with
THINNER 08700 to prevent clogging of the nozzle.
At short stops, prevent packing of zinc around the needle by placing spraygun in
thinner, letting some air pass the gun. At longer stops, clean spraygun with thinner.
After use the hole equipment is cleaned thoroughly with THINNER 08700.
Airless Spray: A large slow-working pump is preferred, e.g 30:1, with a pump capacity of
8-12 litres/minute. In-line filter 60 mesh.
Teflon gaskets.
Nozzle orifice: 019" through .023", 40° through 70°.
Nozzle pressure: 100-150 bar (1430-2100 p.s.i.).
Thinning, if required: max. 30%. (See NOTE below).
(Spray data are indicative and subject to adjustment).
Issued: May 2000/15780 - Page 2 of 5
After use, the whole equipment is cleaned thoroughly with THINNER 08700.
Note: The amount of thinning necessary will depend upon prevailing conditions:
temperature, humidity, wind/ventilation, method of spraying etc.
In the case of a high level of thinning and/or long stops in application, the mixed paint
must be recirculated to avoid settlement of zinc particles in the spray hoses.
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