Sikalastic®-841 ST
Sikalastic®-841 ST is a two part, elastic, 100 % solids, very fast curing and coloured pure polyurea liquid applied membrane with good chemical resistance.
- Very fast reactivity and curing time
- Almost immediate return-to-service time
- Applicable in temperatures from +1 °C to +50 °C
- Performs in constant dry temperatures from -30 °C to +100 °C
- Excellent crack bridging properties
- Good chemical resistance
- UV resistance
- Excellent abrasion resistance
- Not resistant to biogenic sulphuric acid
Usage
On concrete- Bridge deck waterproofing membrane
- Abrasion resistant protective coating in industrial and manufacturing facilities
- Waterproofing for cut and cover structures
- Waterproofing for submersed structures
- Waterproofing on walkways and balconies
- Waterproofing on floors and car park decks
- Water retaining structures in power plants
- Secondary containment structures
- Tank, bund and pit lining in sewage and waste water treatment plants
Advantages
- Very fast reactivity and curing time
- Almost immediate return-to-service time
- Applicable in temperatures from +1 °C to +50 °C
- Performs in constant dry temperatures from -30 °C to +100 °C
- Excellent crack bridging properties
- Good chemical resistance
- UV resistance
- Excellent abrasion resistance
- Not resistant to biogenic sulphuric acid
Packaging
Part A (Isocyanate) | 212 kg drums approx. 189 litres |
Part B (Amine) | 191 kg drums approx. 189 litres |
Colour
Part A | clear |
Part B | grey |
Grey, approx. RAL 7005
Product Details
APPROVALS / STANDARDS
- Coating for concrete protection according the requirements of EN 1504-2/2004,DoP 02 07 02 05 001 0 000014, certified by FPC Notified Body and provided with CE-Marking
- Geoscope GmbH, project No. 131303B, 2013, Determination of the durability of the synthetic membrane Sikalastic-841 ST in an autoclave, based on DIN EN ISO 13438
- BBA/ HAPAS certificate 13/H204 for the use as bridge deck waterproofing membrane according UK standard
- ETA 033 certificate, No. 13/0653 according ETAG 033
- KIWA Polymer Institut GmbH, report No. P7074-2, 2013, Testing od static and dynamic crack bridging ability in accordance with DIN EN 1062-7, as well as bond strength after freeze-thaw-cycling with de-icing salt immersion and after thundershower cycling acc. DIN EN 13687-1 and -2, in combination with Sikafloor®-161
- Truesday Laboraties Inc, certificate for the use in drinking water installations according NSF-ANSI 61, section 6
- KIWA Polymer Institute GmbH, report No. P7934, 2013, Testing of the root resistance according DIN 4062
Chemical Base
Pure Polyurea
Shelf Life
12 month from date of production
Storage Conditions
The packaging must be stored properly in original, unopened and undamaged sealed packaging, in dry and cool conditions. Protected from direct sunlight.
Density
| Part A | approx. 1.12 kg/litre |
| Part B | approx. 1.01 kg/litre |
Density values determined at +20 °C
Viscosity
| Temperature | Part A | Part B |
| +20 °C | approx. 1200 mPas | approx. 800 mPas |
| +25 °C | approx. 750 mPas | approx. 500 mPas |
Shore D Hardness
| ~ 45–50 | (DIN 53505) |
Mechanical Resistance
| ~ 230 mg | H22 / 1000 g / 1000 cy |
| ~ 100 mg | H17 / 1000 g / 1000 cy |
Tensile Strength
| > 15 N/mm² | (DIN 53504) |
Crack Bridging Ability
Class A5 | Static |
Class B4.2 | Dynamic |
Application
Mixing Ratio
Part A : Part B = 1 : 1 volume
Layer Thickness
> 2 mm (Crucial System)
≥ 1.5 mm (Standard System)
Product Temperature
> +65°C
Ambient Air Temperature
-20 °C … +50 °C
Relative Air Humidity
< 85 %
Substrate Temperature
+1 °C … +50 °C
≥ 3 °C above dew point, beware of condensation
Curing Time
24 h / +20 °C
Gel time
~ 11 sec / +20 °C
Waiting Time / Overcoating
1 to 2 min / +20 °C
Consumption
approx. 1.05 kg/m2/mm
APPLICATION INSTRUCTIONS
| Coating System | Product | Consumption |
| System for concrete structures | 1 x Sikafloor®-156 or 1 x Sikafloor®-161 | 0.3–0.5 kg/m2 |
| System for concrete structures | Lightly broadcast with quartz sand, 0.3–0.8 mm | 1.0–1.5 kg/m2 |
| System for concrete structures | 1 x Sikalastic®-841 ST | ~ 1.06 kg/m2/mm |
Dose and mix with a suitable air driven or electrical plural component heated spray equipment. Both components must be heated up to +70 °C. The accuracy of mixing and dosage must be controlled regularly with the equipment. Thoroughly stir part B (Amine) using a drum stirrer until a homogenous colour is obtained.
CLEANING OF TOOLS
Clean all tools with Thinner C immediately after use. The application equipment has to cleaned and filled with Mesamoll. Hardened and/or cured material can only be removed mechanically.