Product Data Sheet Show all documents

Sika® Unitherm® Steel S

Solvent based fire protection coating for indoor steel components

1-component, solvent-based fire protection coating for steel components in the interior of buildings. Forms a heat insulating layer under the influence of fire and improves the fire resistance of steel parts.

  • Quick-drying fire protection system
  • Profile-following coating with low coating
  • Excellent also for highly articulated components
  • No static load
  • Easy to process
  • Flexible color design possible with coating varnish, color shades in RAL, DB, others available
Product Data Sheet Show all documents

Usage

  • Increasing the fire resistance of steel beams, columns and trusses indoors (including open halls). Excluded are lightweight steel construction and components that are constantly exposed to constant moisture, frequent and prolonged periods of very high humidity or highly aggressive gases. For critical loads, e.g. if frequent condensate formation or heating of surfaces (> +45 °C), special measures must be taken if necessary.
  • Quick drying and therefore also suitable for the factory application.
  • Coatings can be dispensed with in permanently dry rooms. 
 

Advantages

  • Quick-drying fire protection system
  • Profile-following coating with low coating
  • Excellent also for highly articulated components
  • No static load
  • Easy to process
  • Flexible color design possible with coating varnish, color shades in RAL, DB, others available

Packaging

25 kg

Colour

White

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • Declaration of Performance (DoP) No. 020604000030000013: CE marking in accordance with the requirements of standard EN 13381-8: 2010 by the certified third-party supervisor 1121
  • EN 13381-8 (ETA 11/0324)
Product Information

Shelf Life

In unopened original container: 18 months from date of production

Storage Conditions

Storage temperature between +5 °C and +30 °C. Store cool and dry.

Density

~ 1.31 kg/l

Flash Point

+32 °C

Solid content by volume

~ 71 ± 3 %

(BCF Guidance Method)

 

Application

Application Information

Relative Air Humidity

Max. 80 %

Dew Point

No condensation!

The substrate temperature during application and curing must be at least 3 °C above the dew point. 

Surface temperature

Min. +5 ° C, max. +40 ° C

For higher temperatures please contact the technical sales adviser. 

Waiting Time / Overcoating

Sika® Unitherm® Steel S requires a minimum drying time of 24 hours before the Sika® Unitherm® Top S or Sika®Unitherm® Top W top coat can be applied.


The through-drying of Sika® Unitherm® Steel S can be checked by "fingernail test".


Prior to further applications possible contaminations must be removed.

Drying Time

Touch-dry:

< 1 hour

(+23 °C, 60 % r.h.)

Overcoatable:

~ 4 hours with itself

(+23 °C, 60 % r.h.)


Depending on the total layer thickness of Sika® Unitherm® Steel S.


Deviating temperatures, relative humidities and dry film thicknesses have an influence on the drying time.
Consumption

Consumption

Fire resistance class F30

Components

Profile

Profile coefficient U/A


m-1

Dry film thickness


µm

Theoretical material requirement1.

g/m2

Wet layer thickness1.


µm

Beams

Columns

Trusses

Open

< 80

< 100

< 130

< 160

< 180

< 200

< 300

200

250

300

350

400

450

500

380

470

560

660

750

840

930

285

355

425

495

565

635

710

Columns

Trusses

Closed

< 60

< 80

< 100

< 120

< 140

< 160

< 180

< 200

< 220

< 240

< 265

< 300

300

400

500

600

700

800

900

1 000

1 100

1 200

1 300

1 450

570

760

940

1 120

1 310

1 490

1 670

1 860

2 040

2 220

2 410

2 690

435

580

720

850

1 000

1 140

1 280

1 420

1 570

1 710

1 850

2 060

  1. Determined reference values

 

Fire resistance class F60

Components

Profile

Profile coefficient U/A


m-1

Dry film thickness


µm

Theoretical material requirement1.

g/m2

Wet layer thickness1.


µm

Beams

Columns

Trusses

Open

< 100

< 110

< 120

< 130

< 140

< 150

< 160

< 167

< 174

< 180

< 186

< 193

< 200

< 220

< 240

< 260

< 280

< 300

1 100

1 200

1 300

1 400

1 500

1 600

1 700

1 800

1 900

2 000

2 100

2 200

2 300

2 400

2 500

2 600

2 700

2 800

2 050

2 230

2 420

2 600

2 780

2 970

3 150

3 340

3 520

3 710

3 890

4 080

4 260

4 440

4 720

4 815

5 000

5 180

1 570

1 710

1 850

1 990

2 130

2 270

2 410

2 550

2 680

2 830

2 980

3 120

3 260

3 400

3 610

3 680

3 820

3 960

Columns

Trusses

Closed

< 100

1 900

3 520

2 680

  1. Determined reference values


Example

1 000 μm dry correspond to approx. 1 400 μm wet


Reference

The ratio of dry film thickness to wet film thickness depends, among other things, on the respective application method.


The above consumption data correspond to minimum application quantities without bulk and spray loss.
Application steps

SURFACE PREPARATION

Steel

Blasting in preparation grade Sa 2½ according to EN ISO 12944-4.


Free of dirt, oil, grease and corrosion products.


Steel, hand rusting

Manual derusting (steel brush or suitable tool) in surface preparation degree St 3, EN ISO 12944-4.


Galvanized steel

Free of dirt, oil, grease and corrosion products.


For continuous underwater and condensation water exposure, lightly blast surfaces with a ferrite-free abrasive (sweep blasting according to EN ISO 12944-4).


Existing coating, old coating

Please contact the Technical Department.

MIXING

Stir thoroughly with slowly turning mechanical stirrer, free of lumps. 

 

APPLICATION

The specified dry film thickness is achieved with the airless spraying process. The attainment of a uniform coating thickness and uniform appearance depends on the application method. In general, the spraying process leads to the best result. Depending on the design, the required coating thickness can be achieved by brushing or roller application, further work processes must be planned for local conditions. Before starting the coating work, it is advisable to check by means of a test area on site whether the selected application method with the agreed product corresponds to the requirements in the result.


Painting, rolling

  • Lambskin rollers, medium pile, solvent resistant
  • Paint brushes, solvent-resistant


Airless spraying

Material:

Process undiluted

Pump:

Powerful piston pump

Gear transmission ratio:

45:1

Sieves and filters:

Remove

Hose diameter:

≥ NW 10

Whip:

1.5 - 2.0 m, NW 6, possible

Recommended nozzle diameter:

0.53 - 0.66 mm or

0.021 - 0.027 inches

Hoses:

Use only for dispersion!

Protect the coating from the effects of the weather until the entire coating has been completed and fully cured. Ensure adequate ventilation.


Note: Sika® Unitherm® Steel S must be applied in several coats to the final dry film thickness. The wet layer thickness of the first coat directly onto the primer should be max. 400 μm. A wet coat thickness of approx. 750 μm is recommended for each subsequent coat.

CLEANING OF TOOLS

SikaCor® Cleaner

 

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