Sikalastic®-833 R
Sikalastic®-833 R is a 2-part, pure polyurea, hot spray applied, crack-bridging, roof waterproofing membrane. It requires an aliphatic top coat when applied to fully exposed roofs.
- Thickness: ~2,0–2,4 mm
- Good resistance to ageing
- Good crack-bridging properties
- Colour added on site using coloured paste
- Seamless finish
- Good elasticity and elongation at break
- Fast application
- Applied by 2-Component hot spray equipment
- Easily detailed around complex geometries
- Good chemical resistance
- Available in various colours
- Good adhesion to many substrates with the appropriate primers
- Can be applied over bituminous membranes
Usage
For the following waterproofing applications:- Exposed roofs on regulated markets according to ETA-005
- Flat and sloping fully exposed roofs to UV, protected by an aliphatic topcoat
- New construction and refurbishment projects
- Balcony and terrace decks underneath a protective layer (i.e. ballast, paving slabs, tiles)
- For exterior use only
Advantages
- Thickness: ~2,0–2,4 mm
- Good resistance to ageing
- Good crack-bridging properties
- Colour added on site using coloured paste
- Seamless finish
- Good elasticity and elongation at break
- Fast application
- Applied by 2-Component hot spray equipment
- Easily detailed around complex geometries
- Good chemical resistance
- Available in various colours
- Good adhesion to many substrates with the appropriate primers
- Can be applied over bituminous membranes
Packaging
| Part A (Polyamide) | 193 kg drum |
| Part B (Isocyanate) | 203 kg drum |
| Part C (Coloured paste) | 4 kg |
Refer to current price list for packaging variations
Colour
Available in various colours
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.
Additional UV protection can be achieved by application of Sikalastic®-701 topcoat
Product Details
APPROVALS / STANDARDS
- CE Marking and Declaration of Performance to European Technical Assessment ETA 19/0636, based on ETAG 005 Part 1 and Part 6 — Liquid applied roof waterproofing kits. Part 1: General. Part 6: Specific stipulations for Kits based on Polyurethane
- European Technical Assessment 19/ 0636 25/ 10/ 2019
Chemical Base
Pure polyurea
Shelf Life
12 months from date of production
Storage Conditions
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 kg/l |
| Part B (Isocyanate) | 1,12 kg/l |
Values at +20 °C
Solid content by weight
~100 % by weight
Solid content by volume
~100 % by volume
System Structure
System
- Sikalastic®-833 R
- Sikalastic®-701
- Primers:
| Substrate | Primer |
| Cementitious substrates, tiles, stones, ceramic tiles (unglazed) | Sikafloor®-151 lightly broadcast* 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 | Sikalastic®-833 R | ~2,0–2,4 kg/m2* |
| Top coat** | Sikalastic®-701 | ~0,33 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.
* Depending on the use, without top coat ~2,4 kg/m2, with top coat ~2,0 kg/m2
**If exposed to UV, the use of the topcoat will extend the lifetime of the membrane.
Optional top coats: Sikalastic®-622 UV/-622 E UV. Refer to the individual Product Data Sheets.
Shore A Hardness
| ~90 | (ISO 868) |
Shore D Hardness
| ~40 | (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.
Artificial Ageing
Limited resistance to UV-induced degradation
Dry film thickness
~2,4 mm without top coat
~2,0 mm with top coat
Application
Mixing Ratio
Part A : Part B = 1 : 1 (by volume)
Part A : Part B = 1 : 1,03 (by weight)
Product Temperature
| Part A (Polyamide) | +70 °C |
| Part B (Isocyanate) | +65 °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 on Sikalastic®-833 R allow:
| Substrate Temperature | Minimum waiting time | Maximum waiting time |
| +10ºC | ~10 minutes | 4 hours |
| +20ºC | ~10 minutes | 3 hours |
| +30ºC | ~10 minutes | 2 hours |
| +45ºC | ~10 minutes | 1 hours |
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. Then completely remove all the dust by industrial vacuuming equipment. The final prepared surface must not have any sheen residue present.
Before applying Sikalastic®-701 on Sikalastic®-833 R allow:
| Substrate Temperature | Minimum waiting time | Maximum waiting time |
| +10ºC | ~2 hours | ~24 hours |
| +20ºC | ~2 hours | ~24 hours |
| +30ºC | ~2 hours | ~24 hours |
| +45ºC | ~2 hours | ~24 hours |
If the maximum waiting time / overcoating time is exceeded, provide a mechanical bond as detailed above for Sikalastic®-833 R on Sikalastic®-833 R.
Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Tack Free Time
~10 minutes
Drying Time
Gel time mixture A+B (20 g)
- 8–9 s at 25 °C
- 4–6 s at 60 °C
Applied Product Ready for Use
Rain Resistant: ~10 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
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
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.
Refer to the Sika Method Statement: Sikalastic®-833 R.
CLEANING OF TOOLS
Clean all tools and application equipment with Thinner C immediately after use. Hardened material can only be removed mechanically.