Sikalastic®-835 I

• Provided with CE-marking, according to EN1504-2.

• Reaction to Fire (EN13823): Class E

• Accelerated Weathering UV Test (ASTM G 53)

• Slip coefficient (B.C.R.A. Method - D.M. 14/06/1989 No.236 Art: 8.2.2)

Two part aromatic polyurea

The product must be stored properly in original, unopend and undamaged sealed packaging, in dry conditions at temperatures between 41°F (+5°C) and 86°F (+30°C). Higher storage temperatures may reduce shelf life of product.

Density values determined at 77°F (+25°C)

0 g/L

Viscosity values determined at 77°F (+25°C)

These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level and waste etc.

During the design fase, the thickness of the Sikalastic®-835 I must be assessed considering: intended use, level of stress and expected durability.

Sikalastic®-835 I is resistant to many chemicals (Test Method ASTM D1308 at 77°F (+25°C). It is also resistant to long-term contact with hydrocarbons (diesel and gasoline) fot at least 72 hours.

Resistant to ozone according to (UNI EN 1844:2013).

Gas Permeability Tests:            (UNI EN 1779 / UNI EN 1330-8)

Simultaneous exposition to thermal and mechanical stress can reduce the chemical resistance of the product.
 

Sikalastic®-835 I has been tested according to ASTM G53 (UVB-313 lamp / cycle 140°F (+60°C).

Sikalastic®-835 I has been tested according to ASTM G53 (UVB-313 lamp / cycle 140°F (+60°C).

-22°F (-30°C) min. / 284°F (+140°C) max.

5°F (-15°C) min. / 158°F (+70°C) max.

85% U.R. max.

Beware of condensation. The substrate temperature must be at least 37°F (3°C) above dew point to reduce the risk of condensation on the surface.

5°F (-15°C) min. / 158°F (+70°C) max.

< 4% pbw moisture content. Test method: Sika®-Tramex meter, CM - measurement or Oven-dry-method. No rising moisture according to ASTM 4263 (Polyethylene-sheet).

For high moisture content substrates apply Sikafloor EpoCem® as a Temporary Moisture Barrier (TMB) system.

Before applying Sikalastic®-835 I on Sikalastic® EP Primer/Sealer or Sika® Concrete Primer Lo-VOC, allow:

Before applying Sikalastic®-835 I on lightly broadcasted epoxy primers (Sikalastic® EP Primer/Sealer), allow:

Before applying Sikalastic®-835 I on Sikalastic®-835 I allow:

Note: Times are approximate and will be affected by surface conditions and changing ambient conditions.

Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.

Equipment needed:

• Proportioner / spray pump
     Integral heaters
     High pressure capacity
     Activity log
• Heated hoses
• Spray gun
• Transfer pumps
• Agitator
• Gel filters
• Air compressor

Substrate Quality

• Concrete substrates must be sound and of sufficient compressive strength (minimum 25 N/mm²) with a minimum pull off strength of 1.5 N/mm²

• Substrates must be clean, dry and free of all contaminants such as dirt, oil, grease, coatings and surface treatments, etc.

• If in doubt, apply a test area first

• Bituminous membranes must be clean, intact, continuous, with full adhesion to the substrate, dimensionally stable and free of reptation

The substrate preparation methods strictly depend on substrate type, conditions and stress level expected
 

Substrates which must always be primed are:

• Cementitious substrates (concrete, screeds, mortars, plasters, etc.) and bricks
• Tiles
• Metal

Cementitious Substrates, Bricks and Tiles
Must be prepared mechanically with suitable abrasion equipment to remove cement laitance, dust, loose and friable material and achieve an open textured surface.

Weak material must be removed and surface defects such as blowholes and voids must be fully exposed. Repairs to the substrate, filling of blowholes/voids and surface levelling must be carried out using appropriate products from the Sika® range of repair materials. The surface has to be leveled in order to achieve an even surface without high spots.

The surface must be primed with appropriate Sika® primer. In case of particularly absorbent substrates which need to be consolidated, prime with Sikalastic® EP Primer/Sealer, lightly broadcast with quartz sand, 0.4-0.7 mm, before the application of Sikalastic®-835 I.

Metal
Metal surfaces must be prepared by blast cleaning to Sa 2 ½ (ISO 8501-1) or SSPC-SP 10 or 11. The substrate has to be free from contaminants detrimental to adhesion, preferably by high pressure water spray, prior of blast cleaning. The surface must be coated with Sikalastic® EP Primer/Sealer, then apply the preformed strip sealant Sika® Joint Tape SA along joints, cracks or spots (eg. mechanical fasteners).

Bituminous Membrane
Cracks or damages of the membrane have to be repaired with like in kind repair products. The surface must then be thoroughly cleaned by high pressure water spray. Once the surface is dry, the required primer may be applied.

•  Premix the resin only at least 30 minutes and then preheat both components to at least 15 – 25˚C (60 – 75˚F). 
• 1:1 fixed mixing ratio (for PUA).
• First heat up the hose and once hose is up to temperature, turn on the primary heaters and allow to come up set point temperature (above  70˚C / 160˚F).
•  Pressurize the system (170 – 200 bar / 2500-2900 PSI) and maintain the pressure balance (max. 10%) between ISO and resin.
   

• Apply Sikalastic® 835i using a plural component, heated, high pressure, proportioning spray equipment. The proportioning equipment utilized must be capable of supplying correct pressure and heat for the appropriate hose length on a consistent basis
• Both components must be heated up to 140°F(+60C) to 176°F(+80°C), both in drum and hose. The recirculation system should be activated during the preliminary drums heating
• The correct mixing ratio is: 1 : 1 by volume. The accuracy of mixing and dosage must be controlled regularly with the equipment
• Thoroughly mix Sikalastic®-835 I part A pigmented resin using a low speed drum mixer until a homogenous mixture and color is obtained
• For part B (isocyanate), it is recommended to use a suitable drier filter in order to protect this component from the humidity
• Beware: on highly absorbent substrates, in order to avoid blowholes and voids on the surface of the product (just sprayed), it is recommended to apply epoxy primers such as Sikalastic® EP Primer/Sealer in multiple layers until the surface porosity is filled. Lightly broadcast the primer with clean and dry quartz sand, 0.4 - 0.7 mm. Do not blind the primer
• Apply suitable systems to seal dynamic joints, connections and cracks. Please contact our Technical Service for more detailed information