Product Data Sheet Show all documents

Sika® Unitherm® Top S

Solvent based PVC-AY topcoat for fire protection coatings on structural steel

Sika® Unitherm® Top S and Sika® Unitherm® Top S EG (DB colour shades) are high build single pack topcoats specially designed for Sika® Unitherm® and Sika® Pyroplast® intumescent fire protection systems against humidity and mechanical strain. Sika® Unitherm® Top S / Sika® Unitherm® Top S EG has no impact on the formation of the heat insulating foam of the intumescent coatings.

  • No impact on the foaming reaction of intumescent coatings
  • Applicable on all Sika® Unitherm® and Sika® Pyroplast® intumescent coating systems for steel
  • Meets Type X classification (i.e. exterior conditions) as part of the coating system
  • Simple application, does not increase static load
  • Individual coloration possible with corresponding topcoat, various colour shades in RAL, others available
Product Data Sheet Show all documents

Usage

Sika® Unitherm® Top S / Sika® Unitherm® Top S EG is used as topcoat on fire protected structural steelwork for weathering and / or decorative reasons. In special conditions, i.e. frequent formation of condensation and / or heating up of surfaces above + 45°C, adequate arrangements should be taken. In dry and clean conditions, top coating with Sika® Unitherm® Top S / Sika® Unitherm® Top S EG on Sika® Unitherm® and Sika® Pyroplast® fire protection coatings may not required.  

Advantages

  • No impact on the foaming reaction of intumescent coatings
  • Applicable on all Sika® Unitherm® and Sika® Pyroplast® intumescent coating systems for steel
  • Meets Type X classification (i.e. exterior conditions) as part of the coating system
  • Simple application, does not increase static load
  • Individual coloration possible with corresponding topcoat, various colour shades in RAL, others available

Packaging

Sika® Unitherm® Top S /
Sika® Unitherm® Top S EG


13 kg net.

Sika® Unitherm® Thinner

25 l and 5 l

Colour

RAL colour shades, DB colour shades (MIO)

Others available on request.

Product Details

Product Information

Shelf Life

18 months

Storage Conditions

In originally sealed containers in a cool and dry environment.

Density

~1.30 g/cm3 Sika® Unitherm® Top S (colour shades in RAL)
~1.25 g/cm3 Sika® Unitherm® Top S EG (DB colour shades (MIO))

Flash Point

+ 38°C

Solid Content

~61 % by weight

(according to ISO 3251)

Application

Application Information

Relative Air Humidity

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 / Sika® Unitherm® Top S EG topcoat as well as transportation special protection measures must be taken against weathering.

Note: With critical situation i.e. frequent formation of condensation and / or heating up of surfaces above + 45°C, adequate arrangements should be taken.

Surface Temperature

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

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

Waiting Time / Overcoating

Sika® Unitherm® Top S / Sika® Unitherm® Top S EG requires a minimum of 24 h drying prior application with itself.

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

Through-drying of the used Sika® Unitherm® or Sika® Pyroplast® intumescent coating can be checked by 'fingernail-test'.

Prior to further applications possible contaminations must be removed.

Drying Time

Drying/Curing

Average drying time of Sika® Unitherm® Top S / Sika® Unitherm® Top S EG at approx. + 20°C object temperature and 60 % relative humidity:

Touch-dry~4 h
Overcoatable with itself~24 h
Through-drying

~48 h

Different temperature, different relative humidity and different coating thickness have an influence on drying time.

 
Consumption

Consumption

Interior use (Type Z1/ Z2):
Dry film thickness
~60 μm
Theoretical coveragemin. 160 g/m2

Exterior use (Type X):
Dry film thickness (total)

~100 μm
Theoretical coveragemin. 2 x 140 g/m2

The quantities do not cover any material wastages. In case of diluting the loading has to be increased.
Application steps

SURFACE PREPARATION

Prior to application of Sika® Unitherm® Top S / Sika® Unitherm® Top S EG topcoat, the surface to be coated must be dry, clean and free from dirt, oil, grease or any other contamination.

MIXING

Stir thoroughly, free of lumps.

APPLICATION

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 spray equipment with transmission ≥ 30 : 1, pressure approx. 200 bar
  • Hose diameter not below ⅜ “
  • Whip line ¼ “ may be used
  • Nozzle size 0.28 - 0.38 mm (0.011 - 0.015 inch)
  • Hoses must be solvent resistant!

Above data shall be used as a guideline with variations being made to suit local conditions.


Brushing and rolling:

  • Material shall be applied undiluted
  • Solvent resistant brush or roller must be used
  • More than one coat may be necessary

CLEANING OF TOOLS

Immediately after use with Sika® Unitherm® Thinner.

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