PU ZN PRIMER 10L

PU ZN Primer is a highly efficient single pack polyurethane anti-corrosive solvent-based moisture-cured primer.

PU ZN Primer is a product which has a unique system with zinc and micaceous iron oxide (MIO). These components yield a reliable long-term coating with corrosion protection and barrier properties for prepared steel surfaces. This primer can be used on poorly prepared steel surfaces, prior to protective or waterproofing membranes

The primer can be applied at high relative humidity, subzero temperatures and without restriction on dew point. Has no restriction on the maximum over-coating time.

Surfaces primed with PU Zn Primer have a high coefficient of friction (0.47 at +20 ° C), which allows application of primer to contacting surfaces of bolted connections and does not require subsequent removal of the coating is assembled.

APPLICATIONS

The primer is recommended to be used as zinc-rich anti-corrosive primer on blast-cleaned steel or other metal surfaces. PU ZN Primer is used as anti-corrosion system in conjunction with other materials such as waterproofing membranes for metal roofing

TECHNICAL DATA

INFORMATION ON THE PRODUCT BEFORE APPLICATION

Chemical description

Moisture-cured, monocomponent polyurethane resin, in organic solvent.

Physical state

Liquid

Packaging

Metal container

10L

Non-volatile content (%)

67%

Flash point

>21ºC

Available colour Dark grey

Density 2.3 g/cm3 (25ªC)

VOC (g/L i %) VOC class as per 2004/42/EC

<260 g/L 32% by weight

Product subclass: h 2 Consolidating primers, solvent based

Phase II froml 01/01/2010 on: 500 g/l

Storage and use before

The product must be stored in only original sealed containers at temperatures from 5ºC to 30ºC.Keep away from heat and ignition sources. Use before 12 months after manufacturing date.

INFORMATION ON THE FINAL PRODUCT

Final state Solid film

Colour Dark grey

Adhesion strength ASTM D4541

Metal: >4 Termal Resistance

Stable up to 145ºC.

Chemical resistance

Surface contact 24 h, (5=best, 0=worst)

Water: 5

Solvents: 4

APPLICATION

PU Zn Primer is a single pack material and it must be thoroughly stirred to achieve completely homogeneous material. Before opening and stirring the temperature of material must be at least 3ºC above dew point.

Before application the material must be thoroughly stirred using a mechanical stirrer. The constant stirring is not required. After stirring the surface of the material in the bucket must be covered with the approximately 100-200 ml of solvent in order to avoid humidity penetration and the bucket must be resealed after it (in case of slow speed of spraying or bad weather condition). (For more details please contact Krypton Chemical).

Viscosity of the primer will be increase at lower temperatures. In order to maintain an application viscosity and prevent excessive thinning of the primer, temperature of primer should be maintained not lower than +15°C during application.

Spray application

The main way of application is airless spray. The air spray method is also acceptable.

Pressure at nozzle 17-20 MPа

Nozzle tip 0,0153-0,023”

Spray angle: 40-80°

Filter: To provide filter cleanliness. Filter Size – 60 mesh (250 μm)

Brush application

This method is recommended for stripe coating and small area repairs. The resulting wet and dry film thickness must be watched carefully.

Airless application recommendations:

Thinning:

The addition of thinner is usually not necessary. If necessary Rayston Solvent can be added up to 10% to the volume. Other solvents, eg reactive with isocyanate are not suitable.

FILM THICKNESS AND CONSUMPTION RATE

Dry film thickness, μm 80 – 150

Wet film thickness, μm : 119-224

Theoretical consumption rate, kg/m2: 0.3-0.5

CURING TIME

Curing time depends strongly on the ambiental conditions. The higher the temperature and humidity are, the faster PU ZN Primer cures. The following table gives approximate values at 60% RH.

Conditions Dry to touch (h)

-18ºC - 20hours

-10ºC - 16hours

0ºC - 8 hours

10ºC - 30 min

23ºC - 10 min

40ºC - 10 min

Complete curing takes place in 5-10 days depending on temperature.