PolyShield Primer

PolyShield (Polyurethane Shield) is a comprehensive system for corrosion protection in the chemical and petrochemical industries. To achieve 100% effectiveness, both primer and topcoat must be used. The solvent-based, 2-component primer should be applied as the first protective layer in the complete system. It complies with the requirements of MIL-PRF-4556F.

1. Application Areas:
PolyShield is ideal for the construction of steel and concrete structures, machinery manufacturing, the construction of plants and wagons, as well as pipelines, storage tanks, and cisterns, where optimal adhesion and reliable corrosion protection are required. 

Chemical Resistance Overview of PetroGuard Long-term durability with minimal changes in material properties.
Ammonia solution 25%	Linseed oil	Sulfuric acid < 5%	Hydrochloric acid < 10%
Gasoline	Diesel fuel	JetA1 kerosene	Soap solution
n-Butyl ether	Caustic soda < 50%	Silicone oil	Transmission oil
Cyclohexane	Crude oil	Transformer oil	Diesel oil
Ethanol	Castor oil	Water	Saltwater
Ethylene glycol	Xylene	Glycerin	Adblue

1.1 Durability: Long-term temperature resistance (with color change) from -50°C to 200°C (dry) or up to 80°C (wet), excellent thermal, mechanical, and chemical resistance.

1.2 Suitable Substrates: Steel, galvanized steel, aluminum, non-ferrous metals.

2. Technical Guide for Surface Pre-Treatment

Surface preparation is a crucial step when applying coatings, as it significantly influences the durability and quality of the final product. Following the recommendations in this guide and adhering to standards will ensure maximum efficiency and reliability of the coating.

Surface Requirements

The surface to be coated must meet the following requirements:

• Cleanliness: The surface must be completely free of dust, rust, oil, grease, and other contaminants.
• Condition: Remove any loose, flaking old coatings. Well-adhered coatings should be thoroughly sanded.
• Moisture: The surface must be dry before applying the coating to prevent defects.
• Preparation: The surface should be prepared for painting in accordance with measures specified in DIN EN ISO 12944-4. This will ensure proper adhesion of the coating and extend its lifespan.

Steel Surface Preparation

The following methods are recommended for preparing steel surfaces:

• Shot Blasting: It is recommended to perform treatment according to surface preparation class Sa 2½ as per ISO 8501-1: 2007. This ensures effective removal of rust and other contaminants.

Galvanized Surface Preparation

Galvanizing must comply with the requirements of EN ISO 1461 to ensure proper surface preparation for subsequent coatings, especially for duplex systems (combination of zinc coating and paint materials).

Aluminum Surface Preparation

Before applying coatings to aluminum surfaces, it is essential to thoroughly remove all contaminants, including dust, oil, and other foreign substances that may affect the adhesion of the coating.

After cleaning, the surface should be sanded to ensure better bonding of the paint to the aluminum surface.

All work should be carried out in accordance with DIN EN ISO 12944-4 for optimal results.

3. Technical Data

Coating color	Gray or red-brown
Coating gloss	Glossy
Primer density, g/cm³	1.4 kg/L
Primer viscosity	25 dPas or 45″ 4 mm (DIN 53 211) at a temperature of (20±2) °C
Number of components Mixing ratio By weight (kg) By volume (l)	2: Base and hardener   5,0 :1,0 3,4 : 1,0
Pot life, min, hours	8 (20±2) °C at a temperature and relative humidity of 65%.
Non-volatile content by volume, % (vol.) by weight, % (wt.)	51±2 72±4
Drying time to degree 3 (according to GOST 19007) at a temperature of (20.0±0.5) °C, hours, no more than	24
Dry film thickness, µm	From 300 to 1000 microns.
Wet film thickness, µm	From 300 to 1000 microns.
Theoretical consumption	190-350 g/m², depending on the application method, shape, and surface roughness.

    4. Application Instructions

Before use, mix the base and hardener in the ratio specified in section 3. It is recommended to use electric mixing devices to ensure a homogeneous consistency. Avoid introducing air into the prepared mixture. The minimum mixing time is 3 minutes. If necessary, add a solvent afterward.

When organizing the painting work, it is important to consider that as the temperature increases, the working time of the mixture (after the components have been mixed) decreases.

The material should be applied both in factory and field conditions at temperatures ranging from +10 to +35 °C. The temperature of the surface being painted should be at least 3 °C higher than the dew point. The prepared primer must have a temperature of at least +15 °C before application.

The coating dries naturally. The intermediate drying time between layers of PetroGuard primer at +20 °C should be no less than 14 hours.

The curing time for the PetroGuard coating system before being exposed to aggressive environments should be no less than 7 days at +20 °C.

Methods of application	Nozzle diameter	Pressure	Thinner by weight
Brush, roller			At discretion
Air spray	1,5 – 2,2 mm	3-5 bar	5-15%
Airless spraying	0,28 -0,38 mm	150 bar	0-5%

5. Packaging and Storage

PolyShield primer is supplied as a set: base and hardener, packaged in metal buckets and cans depending on the weight of the kit.

Storage conditions should be at ambient temperatures between +10°C and +35°C. The packaging of the components should not be placed near heat sources or exposed to atmospheric precipitation and direct sunlight.

The warranty storage period is 24 months from the date of manufacture.

6. Safety Measures

During work, it is necessary to comply with relevant industry standards and requirements, as well as the safety precautions listed on the packaging label. Use personal protective equipment (goggles, masks, respirators), avoid inhaling solvents during their evaporation, and prevent the material or its components from coming into contact with skin, eyes, and respiratory tracts. Work indoors only when adequate ventilation is provided. The material and its components (base and hardener) are flammable!