Sika® Unitherm® Steel S Exterior

Independently fire tested and approved to major European and national standards including:

• DIN 4102-2 (ref: Z-19.11-1319)
• Solvent based coating for steel protection with CE-mark

18 months

In originally sealed containers in a cool and dry environment.

~1.31 g/cm³

+ 32°C

~71 ± 3% by volume (according BCF Guidance Methode)

Max. 80 %, application temperature shall be at least ≥ 3 K above dew point.

During application and drying of total Sika® Unitherm® coating system including Sika® Unitherm® Top S topcoat as well as transportation special protection measures must be taken against weathering.

Object temperature not below + 5°C, to max. + 40°C*

* If higher temperatures occur, please consult the Technical department for further assistance.

Sika® Unitherm® Steel S Exterior requires a minimum of 24 hours drying prior to application of topcoat Sika® Unitherm® Top S / Sika® Unitherm® Top S EG.

A complete drying of the fire protection coating prior topcoat application is highly recommended.

Through-drying of Sika® Unitherm® Steel S Exterior can be checked by ‘fingernail-test’.

Prior to further applications possible contaminations must be removed.

Drying / Curing

Average drying time at + 23°C:

Different temperature, different relative humidity's and different fire protection coating thicknesses have an influence on drying time.

Example:

1000 μm dry ≈ 1350 μm to 1400 μm wet ≈ 1845 g/m² ≈ 1.408 l/m²

The fire rate of Sika® Unitherm® Steel S Exterior depends on national standard. See corresponding separate consumption table/diagram.

Note: Ratio dry film thickness - wet film thickness varies depending on application method.

Furthermore, proper ventilation is recommended.

Blast cleaned steel:
Blast-cleaning to Sa 2 ½ according to ISO 8501-1.
Free from dirt, oil and grease.

Steel with manual de-rusting:
Manual de-rusting (wire brushing or power tool cleaning) according to ISO 8501-1, St. 3.

Galvanized steel:
Free from dirt, oil, grease and zinc salts.
In case of permanent exposure to submersion and condensation surfaces should be sweep blasted according to ISO 12944-4.
 

Other surfaces:
Tests should be carried out on the specific surfaces.

Please seek further information on info data sheet no. 02 ‘Primers for Sika® fire protection coatings’.

For contaminated and weathered surfaces e.g. galvanized or primed areas we recommend to clean with SikaCor® Wash.

Application to multi coating systems e.g. to accommodate requirements according to ISO 12944-5 (e.g. DFT > 250 μm) are applicable to Sika® Unitherm® Steel S Exterior.

For further information, please consult the Technical Department.

Stir thoroughly with slowly turning mechanical stirrer, free of lumps. Addition of thinner is not necessary.

The method of application has a major effect on achieving uniform thickness and appearance. Spray application will give the best results. The indicated dry film thickness is easily achieved by airless spray. In case of application by roller or brush, additional layers may become necessary to achieve the required coating thickness, depending on type of construction, site conditions, colour shade etc. Prior to application a trial on site may be useful to ensure the selected application method will provide the requested results.

Airless spraying:

• Material shall be applied undiluted
• Airless machine with pressure ratio ≥ 45 : 1
• Screens and filters should be removed
• Hose diameter not below ⅜“
• Nozzle size 0.46 - 0.66 mm (0.019 - 0.027 inch)
• Solvent resistant hoses must be used!
   

By brush and roller:

• Material shall be applied undiluted
• Solvent resistant brush or roller must be used

Note: The Sika® Unitherm® Steel S Exterior shall be applied in several coats up to the final dry film thickness required. Wet film thickness max. 400 μm for first application coat on primer. Wet film thickness approx. 750 μm for each subsequent application coat is recommended.

Immediately after use with Sika® Unitherm® Thinner.