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Corrosion-preventive coatings

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Pragokor Metal E
zincsilicate primer in grey shade with high metallic zinc content

Pragokor Metal E
zincsilicate primer in grey shade with high metallic zinc content

Two-component solvent-based organically modified zincethylsilicate primer in grey shade of high performance for the anticorrosion protection of steel structures. It is self-curing by solvent evaporation and the effect of atmospheric moisture.
 

Features

  • Inorganic paint with high metallic zinc content.
  • Temperature durability up to 400 °C, very good resistance to abrupt temperature changes.
  • Protection lifetime at least 15 years without any demands for maintenance even in very severe atmospheres. The life of the primer should be further increased by the combination with organic topcoats such as epoxy, coal-tar epoxy, polyurethane, chlorine-rubber, vinyl or acrylates. Furthermore, water-based acrylic paints proved very well.
  • After complete curing, very high hardness and durability against wear are achieved.
  • It is able to protect, in a way, the steel substrate electrochemically (cathodically) in minor paint imperfections and shows an increased protection performance against paint undercutting.
  • Complete resistance against UV radiation (sun radiation).

As a single coat or topcoated primer for long-term steel structures protection in aggressive atmospheres or other environments of the pH value within 5,5-10,5 (neutral salts, sea water), the structures exposed to high humidity or water splashing (mining or underearth structures), building structures (bridges), technological structures (columns, exchangers, pipeline bridges, pipelines, furnaces, mills, crushers etc.). It can be used as protective tank linings for storage of crude oil and its refined products (oils, fuels).

It is a cost-saving alternative to zinc metallic coatings (metallizing, galvanizing) and can also be used as a local protection of the burnt metallized or galvanized areas on the structures after welding.

It should be applied by conventional air-assisted spraying, airless spraying or by brush (only small areas) on the steel substrates blasted for the degree Sa 2,5 (ISO 8501-1) in nominal dry film thickness 50 – 90 µm. Unlike the common unmodified zincsilicate paints, Pragokor Metal E may be even applied on the shot blasted steel without any residual grease, resulted profile of lower roughness being tolerated. The primer features enhanced resistance against "mud-cracking" at the thickness up to 200 µm. The paint should be prepared by thorough mixing of both components just before application.

Thinning: Pragokor Thinner Metal or Pragokor Thinner Z (max. 15 % by vol.).

Theoretical spreading rate at the dry film thickness 60 µm: 4,1 m2/kg (11 m2/litre).

VOC content: 0,15 kg/kg (0,40 kg/litre).

Pot-life after mixing of both components: min. 8 hours (at 20 °C).

Drying time to touch: about 3,5 hours (20 °C).

Curing time for topcoating (50 mm of dry film thickness, temperature 20 °C and 75 % relative humidity): about 3 days (enhanced both relative humidity and temperature will accelerate curing process).

Pragokor Metal ES
zincsilicate primer in grey shade with medium metallic zinc content

Pragokor Metal ES
zincsilicate primer in grey shade with medium metallic zinc content

Two-component solvent-based organically modified zincethylsilicate primer in grey shade of high performance for the anticorrosion protection of steel structures. It is self-curing by solvent evaporation and the effect of atmospheric moisture.
 

Features

  • Inorganic paint with a medium metallic zinc content (compared with the Pragokor Metal E type reduced zinc content and, that is why, price).
  • Temperature durability up to 400° C, very good resistance to abrupt temperature changes.
  • Protection lifetime at least 15 years without any demands for maintenance even in very severe atmospheres. The life of the primer should be further increased by the combination with organic topcoats such as epoxy, coal-tar epoxy, polyurethane, chlorine-rubber, vinyl or acrylates. Furthermore, water-based acrylic paints proved very well.
  • After complete curing, very high hardness and durability against wear are achieved.
  • It is able to protect, in a way, the steel substrate electrochemically (cathodically) in minor paint imperfections and shows an increased protection performance against paint undercutting.
  • Complete resistance against UV radiation (sun radiation).

As a single coat or topcoated primer for long-term steel structures protection in aggressive atmospheres or other environments of the pH value within 5,5-10,5 (neutral salts, sea water), the structures exposed to high humidity or water splashing (mining or underearth structures), building structures (bridges), technological structures (columns, exchangers, pipeline bridges, pipelines, furnaces, mills, crushers etc.). It can be used as a protective tank lining for storage of crude oil and its refined products (oils, fuels).

It is a cost-saving alternative to zinc metallic coatings (metallizing, galvanizing) and can also be used as a local protection of the burnt metallized or galvanized areas on the structures after welding. It should be applied by conventional air-assisted spraying, airless spraying or by brush (only small areas) on the steel substrates blasted for the degree Sa 2,5 (ISO 8501-1) in nominal dry film thickness 50 – 90 µm. Unlike the common unmodified zincsilicate paints, Pragokor Metal ES may be even applied on the shot blasted steel without any residual grease, resulted profile of lower roughness being tolerated. The primer features enhanced resistance against “mud-cracking” at the thickness up to 200 µm. The paint should be prepared by thorough mixing of both components just before application.

Thinning: Pragokor Thinner Metal or Pragokor Thinner Z (max. 15 % by vol.).

Theoretical spreading rate at the dry film thickness 60 µm: 4,6 m2/kg (10,8 m2/litre)

VOC content: 0,172 kg/kg (0,407 kg/litre).

Pot-life after mixing of both components: min. 8 hours (at 20 °C).

Drying time to touch: about 3,5 hours (20 °C).

Curing time for topcoating (50 µm of dry film thickness, temperature 20 °C and 75 % relative humidity): about 3 days (enhanced both relative humidity and temperature will accelerate curing process).

Pragokor Metal ESG
zincsilicate primer in green and grey shade with medium metallic zinc content

Pragokor Metal ESG
zincsilicate primer in green and grey shade with medium metallic zinc content

Two-component solvent-based organically modified zincethylsilicate primer in green and grey shade of high performance for the anticorrosion protection of steel structures. It is self-curing by solvent evaporation and the effect of atmospheric moisture. Unlike the common unmodified types of zincsilicate paints with strict demands for the sharp and anchoring profile underneath, an addition of an organic resin to the inorganic paint improves overall applicability and adhesion of the primer to the substrate and makes the paint much more surface-tolerant i.e. surface roughness under the coating is allowed to be reduced and the surface profile after blasting more rounded. Consequently, this less strict demand for surface blasting under the paint enables using a round steel shot blasting material instead of the sharp-edged grit. It is necessary, anyway, for the steel surface after blasting to be without any grease!

The paint for application should be prepared by a thorough mixing of both liquid and powder components.
 

Features

  • Inorganic paint with a medium metallic zinc content (compared with the Pragokor Metal E type reduced zinc content and, that is why, price).
  • Temperature durability up to 400°C, very good resistance to abrupt temperature changes.
  • Protection lifetime at least 15 years without any demands for maintenance even in very severe atmospheres. The life of the primer should be further increased by the combination with organic topcoats such as epoxy, coal-tar epoxy, polyurethane, chlorine-rubber, vinyl or acrylates. Furthermore, water-based acrylic paints proved very well.
  • After complete curing, very high hardness and durability against wear are achieved.
  • It is able to protect, in a way, the steel substrate electrochemically (cathodically) in minor paint imperfections and shows an increased protection performance against paint undercutting.
  • Complete resistance against UV radiation (sun radiation).

It may be applied as a single coat or topcoated primer in the dry thickness of 50 – 90 µm for long-term protection of steel structures in aggressive atmospheres or other environments on the steel substrate blasted for the degree Sa 2,5 (ISO 8501-1). Moreover, it is a cost-saving alternative to zinc metallic coatings (metallizing, galvanizing) and can also be used as a local protection of the burnt metallized or galvanized areas on the structures after welding and, for a colour distinction, as a strip paint applied by brush over zincsilicate primers of the pure grey shade (Pragokor Metal E and ES).
 

The paint is suitable for:

  • Protection of building steel structures (bridges, pylons, towers).
  • Protection of technological structures exposed to high humidity (underground structures), splash of both salt water and fresh water (oil-drilling platforms, hydraulic structures), high temperature (furnaces, stacks, columns) and refined oil products (gasoline, lubricating oils, diesel oil).
  • Sas a cost-saving alternative to zinc-metallizing coatings or galvanizing or for repairing them (e.g. on the local areas after welding).

Thinning: Pragokor Thinner Metal or Pragokor Thinner Z (max. 15 % by vol.).

Theoretical spreading rate at the dry film thickness 60 µm: 4,3 m2/kg (10,5 m2/litre).

VOC content: 0,172 g/kg (0,419 g/litre).

Pot-life after mixing of both components: min. 8 hours (at 20 °C).

Drying time to touch: about 3,5 hours (20 °C).

Curing time for topcoating (50 µm of dry film thickness, temperature 20 °C and 75 % relative humidity): about 3 days (enhanced both relative humidity and temperature will accelerate curing process).

Pragokor Metal Antik
decorative zincsilicate topcoat in anthracitic shade with reduced metallic zinc content

Pragokor Metal Antik
decorative zincsilicate topcoat in anthracitic shade with reduced metallic zinc content

Two-component solvent-based organically modified zincethylsilicate paint in a black-and-grey matt shade, self-curing by solvent evaporation and the effect of atmospheric moisture. It should be used as a decorative topcoat over solvent-based zincsilicate primers Pragokor Metal E, Pragokor Metal ES or Pragokor Metal ESG. It creates the top paint of the entirely inorganic coating system Antik of high performance even in aggressive industrial and marine atmospheres, imitating the original finish of the iron blacksmith´s work. It may be therefore particularly used for both restoration and preservation of iron forge art or historical objects where, besides high anticorrosion protection, the utmost resistance against sunlight and surface chalking are also demanded. As for the rusty steel substrates, they must be at first cleaned with a hand or powered tool for the degree at least St 2 (ISO 8501-1), then 2 – 3 coats of organically modified zincsilicate primer (Pragokor Metal E) made by brush and, finally, 1 - 2 topcoats of Pragokor Metal Antic applied. All residues of old organic paints must be removed completely under the paint system Antik !

The whole above-mentioned painting system has been approved by the National Instiltute for Monuments in Prague and designed and applied by the Girsa Studio for the restoration of historical iron structures in the Český Krumlov and Waldstein castles.

Thinning: Pragokor Thinner Metal or Pragokor Thinner Z (max. 15 % by vol.).

Practical spreading rate at the dry film thickness 40 µm: cca 5 m2/kg - applied by brush.

VOC content: 0,299 kg/kg (0,471 kg/litre).

Pot-life after mixing of both components: min. 12 hours (at 20 °C).

Drying time to touch: about: 4 hours (20 °C).

Curing time at 20 °C and 75 % relative humidity: about 4 days (both elevated relative humidity and temperature will accelerate the curing process).



 

Pragokor Metal SP
zincsilicate shop-primer in grey shade

Pragokor Metal SP
zincsilicate shop-primer in grey shade

Pragokor Metal SP is a two-component solvent-based zincethylsilicate preconstruction primer, in a grey colour, which is to be applied in thinner dry film thicknesses (max. 40 µm). It should be particularly applied, just after blasting process, for inter-operation protection of steel sections and sheets for the period of their storage, transport and handling before the assembly of the structure. Blasting with both grit and shot abrasives is possible under the shop primer.

The paint for application should be prepared by a thorough mixing of both liquid and powder components.
 

Features

  • Inorganic shop primer with metallic zinc content as the anticorrosion pigment of very high performance.
  • Temperature durability up to 400°C, very good resistance to abrupt temperature changes.
  • Protection efficiency at 20 µm of dry film thickness for at least 12 months.
  • After complete curing, very high hardness and durability against wear are achieved.
  • It is able to protect, in a way, the steel substrate electrochemically (cathodically) in minor paint imperfections and shows an increased protection performance against paint undercutting.
  • Complete resistance against UV radiation (sun radiation).

The paint, applied on steel sections or sheets in thickness 15 – 20 µm just after their blasting, is of a very high protection performance and, moreover, will enable their subsequent welding and flame cutting without an inferior welds quality. . In this case, Pragokor Metal SP cannot fully replace the function of the permanent primer which should be applied over the preconstruction primer in the shop or after the assembly of the structure. Suitable primers over Pragokor Metal SP are either organic zinc-rich paints or modified inorganic zincsilicate types Pragokor Metal E or Pragokor Metal ESG which, unlike the unmodified zincsilicates, do not at first require a roughening of the Pragokor Metal SP coating by sweep blasting.

As a permanent primer, it should be used in the dry film thickness 40 µm in the combination with organic topcoats, e.g. epoxides, coal-tar epoxides, vinyl, polyurethanes, chlorine-rubbers, silicones, acrylates, silicone-acrylates and water-based styrene-acrylate copolymers.

Thinning: Pragokor Thinner Z (max. 15 % by vol.).

Theoretical spreading rate at the dry film thickness 20 µm: 17,5 m2/litre.

Pot-life after mixing of both components: min. 12 hours (at 20 °C).

Drying time to touch: about 5 minutes (20 µm thickness, 20 °C).

Curing time for topcoating (20 µm of dry film thickness, temperature 20 °C and 75 % relative humidity): about 3 days (enhanced both relative humidity and temperature will accelerate curing process).

Pragokor Thinner Metal
thinner for the adjustment of viscosity of organically modified zincsilicate paint applied at higher temperatures

Pragokor Thinner Metal
thinner for the adjustment of viscosity of organically modified zincsilicate paint applied at higher temperatures

Pragokor Thinner Metal is suitable for the adjustment of the consistency of organically modified zincsilicate paints Pragokor Metal E, Metal ES, Metal ESG and Metal Antik for their application by brush, conventional air-assisted spraying and airless spraying within the atmosphere temperature range +5 °C - +40 °C. Owing to its a bit lower volatility, the thinner is predominantly recommended for higher application temperatures over 20 °C in the amount 10 – 15 % by volume (related to the volume of the unthinned paint).

Pragokor Thinner Metal Z
thinner for the adjustment of viscosity of organically modified zincsilicate paint applied at lower temperatures

Pragokor Thinner Metal Z
thinner for the adjustment of viscosity of organically modified zincsilicate paint applied at lower temperatures

Pragokor Thinner Metal Z is suitable for the adjustment of the consistency of organically modified zincsilicate paints Pragokor Metal E, Metal ES, Metal ESG and Metal Antik for their application by brush, conventional air-assisted spraying and airless spraying within the atmosphere temperature range -5 °C - +40 °C. Owing to its a bit higher volatility, the thinner is predominantly recommended for lower application temperatures under 20 °C, i.e. during winter, autumn and spring season in the amount 10 – 15% by volume (related to the volume of the unthinned paint). Besides, it should be used for thinning of zincsilicate shop primers as well, e.g. Pragokor Metal SP.

Pragokor Penetral
solvent-based sealing agent over zincsilicate primers

Pragokor Penetral
solvent-based sealing agent over zincsilicate primers

A solvent-based sealing agent for the surface treatment of cured inorganic zincethylsilicate primers Pragokor Metal E, Metal ES, Metal ESG and Metal SP before the application of high-solids or highly consistent paints. Pragokor Penetral is able to penetrate easily and seal the micropores in zincsilicate paints and, therefore, prevents formation of undesired bubbles and craters in the film of the following topcoats like that.

It should be applied unthinned by brush or as a “mist” spray over cured zincsilicate paint, one coat being usually sufficient. Drying time within 15 minutes (20 °C) and practical spreading rate about 50 m2/kg.

 

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