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Sikagard®-831

Interior and exterior intumescent coating for commercial vehicles

Sikagard®-831 is a solvent-free 2-pack modified epoxy-based intumescent fire-protection coating for internally or externally exposed aluminum or steel surfaces. It provides very high durability and combined corrosion and fire protection (EN45545 / NFPA 130). It is easily applied with standard airless spray equipment, requires no reinforcement, cures rapidly to a very tough and resistant finish ready for handling and transportation after 24 hours.  

  • Highly resistant to mechanical impact and damage in service
  • Passes EN 45545-3 R45 / EN 45545-2 R1 / R7
  • Can be applied in one coat for up to 4 mm dry-film thickness
  • Application directly on blast-cleaned steel surfaces
  • Rapid cure – handling and transport ready in 24 h
  • No primer or top coat needed
  • Meets the NFPA 130 standard
 
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PRODUCT BENEFITS

  • Highly resistant to mechanical impact and damage in service
  • Passes EN 45545-3 R45 / EN 45545-2 R1 / R7
  • Can be applied in one coat for up to 4 mm dry-film thickness
  • Application directly on blast-cleaned steel surfaces
  • Rapid cure – handling and transport ready in 24 h
  • No primer or top coat needed
  • Meets the NFPA 130 standard
 

Areas of Application

Sikagard®-831 is designed primarily for in-shop applications. It is typically used in the Transportation and Marine industry where it can be applied on internal and external aluminum, steel and GRP surfaces.
This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.  

Product Details

Typical Product Data
Chemical base

2-component epoxy

Color

Light grey

Cure mechanism

Polyaddition

Density

mixed

1.4 kg/l

Solid content (CQP002-2)

100 %

Mixing ratio

by weight

by volume

100 : 12

100 : 18.4

Application temperature

10 ─ 40 °C

Pot-life

at 20 °C

at 35 °C

30 minutes

15 minutes

Curing time

touch dry

hard dry (ready for handling and transport)

8 hours A

25 hours A

Compressive strength (ISO 604)

45 MPa

Tensile adhesion strength (ISO 4624)

10 MPa

Tensile strength (CQP036-1 / 580-5,-6 / ISO 527-2)

10 MPa

Abrasion resistance (ISO 5470-1)

1000 g; disc: CS 10

65 mg/1000 R

Shelf life (CQP016-1)

24 months B

CQP = Corporate Quality Procedure

A) 23 °C / 50 % r. h.

B) storage below 25 °C

Application

Application Information

METHOD OF APPLICATION

Application by airless spray will give the best results and is recommended to achieve uniform thickness and appearance. 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, color shade etc.

It is recommended, to perform prior to application a trial on site to ensure the selected application method will provide the requested results.

Sikagard®-831 is commonly applied by airless spray equipment i.e. single pump equipment with a flow heater, or plural pump equipment.

A suitable standard airless spraying equipement setup looks as follows:

Pressure ratio: ≥ 66 : 1, air flow rate: ≥ 24 l/min, pressure rate: at the spray gun ≥ 200 bar, nozzle size: 0.019 ─ 0.025" (0.48 ─ 0.64 mm), spraying angle: 20 ─ 40°

The material temperature can reach up to 35 °C at the nozzle outlet.

Note: Remove the filter mesh (not required). Use direct material feed (without suction hose). At lower temperatures it is recommended to use insulated spray hoses (length of spray hose max. 25 m).

Surface preparation

For steel, blast cleaning Sa 2.5 according to ISO 8501-1 is required. In case of manual de-rusting use wire brushing or power tool cleaning according to ISO 8501-1 St. 3. For galvanised steel the surface must be free of dirt, oil, grease and corrosion.

In case of permanent submersion or exposure to condensation, surfaces need to be sweep blasted according to ISO12944-4.

For other surfaces tests must be carried out on the specific surfaces. For contaminated and weathered surfaces of galvanized steel or primed areas, an appropriate cleaning is mandatory.

 

Application

Application conditions need to be as follows: Substrate surface and ambient have to be between 10 °C and 40 °C. Optimum results are achieved at temperatures above 15 °C. Relative humidity has not to exceed 80 % and the ambient temperature has to be ≥ 3 K above dew point.

If overcoating is required, the minimum waiting time at 20 °C is 8 hours, whereas the maximum is 7 days for interior and 2 days for external applications.

Note: The previously applied coating must be dry and free from any dirt, moisture or contaminants that could prevent or reduce adhesion.

For repairs it is required to abrade adjacent areas to a matt finish and clean off dust. Mask if necessary and then apply the Sikagard®-831.

Removal

Thoroughly clean tools and equipment with Sika® Remover-208 immediately after completion or interruption of the application process.