Sikalastic®-833 R ALU
Aluminium finish hybrid polyurea hot spray applied membrane for roof waterproofing
Sikalastic®-833 R ALU is a 2-part, hybrid polyurea, hot spray applied, crack-bridging, roof waterproofing membrane. It contains special aluminium particle pigments which provides a sun-reflective aluminium finish and increased resistance to UV exposure.
- Good crack-bridging properties
- Seamless finish or textured when over-sprayed
- Good resistance to UV exposure
- Thickness:~ 2,0–2,4 mm
- Good elasticity and elongation at break
- Good abrasion resistance
- Fast application
- Applied by 2-Component hot spray equipment
- Easily detailed around complex geometries
- Good chemical resistance
- Available in various colours
- Performs in constant temperatures from -30 °C to +100 °C
- Good adhesion to many substrates with the appropriate primers
- Can be applied over existing corrugated metal roofs
Usage
Designed for the following waterproofing applications:- New construction and refurbishment projects
- Balcony and terrace decks underneath a protective layer (i.e. ballast, paving slabs, tiles)
- Waterproofing membrane for concrete, metal, pedestrian decks, stadium seating floor areas
- Solar reflective surfaces
- For exterior use only
Advantages
- Good crack-bridging properties
- Seamless finish or textured when over-sprayed
- Good resistance to UV exposure
- Thickness:~ 2,0–2,4 mm
- Good elasticity and elongation at break
- Good abrasion resistance
- Fast application
- Applied by 2-Component hot spray equipment
- Easily detailed around complex geometries
- Good chemical resistance
- Available in various colours
- Performs in constant temperatures from -30 °C to +100 °C
- Good adhesion to many substrates with the appropriate primers
- Can be applied over existing corrugated metal roofs
Packaging
| Part A (Polyamide) | 192 kg drum |
| Part B (Isocyanate) | 208 kg drum |
Refer to current price list for packaging variations
Colour
Aluminium (~RAL 9006, ~RAL 9007)
Applied colours selected from colour charts will be approximate.
For colour matching: Apply colour sample and confirm selected colour under real lighting conditions.
When product is exposed to direct sunlight (UV), there may be some discolouration, colour variation and chalking
Product Details
Chemical Base
Hybrid polyurea
Shelf Life
12 months from the date of production
Storage Conditions
Important: Sikalastic®-833 R ALU is hygroscopic. Protect from moisture. Part B may become cloudy when stored at the lower temperature range. Reheat up to +15 °C before use.
Product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.
Density
| Part A (Polyamide) | ~1,05 g/l |
| Part B (Isocyanate) | ~1,14 g/l |
Values at +20 °C
Solid Content
~100 %
Viscosity
| Part | Value |
| Part A | ~975 mPa·s |
| Part B | ~800 mPa·s |
Values at +20 °C
System Structure
System
- Sikalastic®-833 R ALU
- Primers:
| Substrate | Primer |
| Cementitious substrates, tiles, stones, ceramic tiles (unglazed) | Sikafloor®-151 lightly broadcasted* with quartz sand 0,3–0,8 mm or Sika® Concrete Primer |
| Bituminous based membranes | Sikalastic® Metal Primer |
| Metal substrates | Sikalastic® Metal Primer |
Other substrates must be tested for their compatibility. If in doubt, apply a test area first.
* Do not broadcast in excess.
Consumption
| Layer | Product | Consumption |
| Primer | Depending on the substrate | Refer to individual Product Data Sheet |
| Base coat/Top Coat | Sikalastic®-833 R ALU | ~2,0–2,4 kg/m2 |
These figures are theoretical and do not include for any additional material required due to surface porosity, surface profile, variations in level
and wastage.
The consumption of the waterproofing layer can be increased according to the system expected service life requirements.
Shore A Hardness
| ~90 | (EN ISO 868) |
Shore D Hardness
| ~40 | (EN ISO 868) |
Tensile Strength
| ~14 MPa | (EN-ISO 527-3) |
Tear Strength
| ~69 N/mm | (ISO 34-1 Method B) |
Chemical Resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information.
Thermal Resistance
-30 °C / +100 °C
Dry film thickness
~2,0–2,4 mm
Application
Mixing Ratio
Part A : Part B = 1 : 1 (by volume)
Product Temperature
| Part A (Polyamide) | +70/+75 °C |
| Part B (Isocyanate) | +65/+70 °C |
| Hose | ~65 °C |
Air Pressure of the spraying equipment must be ~170 bar.
Spray equipment fine temperature adjustments could be helpful to obtain equal output pressures of the 2 parts.
Higher temperatures provide lower viscosity & lower pressure.
Ambient Air Temperature
+5 °C min. / +40 °C max.
Relative Air Humidity
≤ 85 % max
Substrate Temperature
+5 °C min. / +50 °C max.
Dew Point
Beware of condensation.
The substrate and uncured applied membrane must be at least +3 °C above dew point.
Substrate Moisture Content
≤4 % parts by weight.
The following test methods can be used: Sika®-Tramex meter, CM-measurement or Oven-dry-method. No rising moisture according to ASTM (Polyethylene sheet).
Waiting Time / Overcoating
Before applying Sikalastic®-833 R ALU on Sikalastic®-833 R ALU allow:
Important: When a textured finish is required, the spraying must be carried out within 5 minutes after application of the main layer.
| Substrate Temperature | Minimum waiting time | Maximum waiting time |
| +10 °C | ~10 minutes | 4 hours |
| +20 °C | ~10 minutes | 3 hours |
| +30 °C | ~10 minutes | 2 hours |
| +45 °C | ~10 minutes | 1 hour |
- Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
- If the maximum waiting time / overcoating time is exceeded, Sika® Concrete Primer must be applied at consumption rate of 100 g/m2 as an adhesion promoter between the layers.
- As an alternative, the membrane surface will need to provide a mechanical bond. This can be achieved by lightly abrading with mechanical abrasive equipment to remove all the surface sheen.
- Select the abrasive grit size and intensity of abrading depending on the condition of the membrane.
- Completely remove all the dust by industrial vacuuming equipment.
- The final prepared surface must not have any sheen residue present.
Tack Free Time
~10 minutes
Applied Product Ready for Use
Rain Resistant: ~15 minutes
Time is approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
EQUIPMENT
Mixing and spraying
- Drum stirrer
- Air driven or electrical 2-Component heated spray equipment
Contact Sika Technical Services for local equipment suppliers.
SUBSTRATE PREPARATION
Refer to the Sika Method Statement: Sikalastic®-833 R ALU
Suitable substrates
Concrete, bituminous felts and coatings, metal, brick masonry, asbestos cement, ceramic tiles.
General
All contamination such as dust, loose and friable material that could affect final finish or reduce adhesion, must be completely removed from all surfaces before application of the product or subsequent products, preferably by industrial vacuuming equipment.
MIXING
Refer to the Sika Method Statement: Sikalastic®-833 R ALU
APPLICATION
Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.
Important: During application, check layer thickness and curing speed.
Note: If a non-smooth surface is required, Sikalastic®-833 R ALU can be over-sprayed to achieve a textured finish.
Refer to the Sika Method Statement: Sikalastic®-833 R ALU
CLEANING OF TOOLS
Clean all tools and application equipment with Thinner C immediately after use. Hardened material can only be removed mechanically.