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Sikalastic®-841 ST

Liquid applied pure polyurea membrane

Sikalastic®-841 ST is a two part, elastic, 100 % solids, very fast curing and coloured pure polyurea liquid applied membrane with good chemical resistance. Suitable for use in hot and tropical climatic conditions.

  • 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
  • Excellent abrasion resistance
  • UV light exposure may lead to yellowing and chalking
  • Not resistant to biogenic sulphuric acid
 
Sikalastic®-841 ST
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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
  • Excellent abrasion resistance
  • UV light exposure may lead to yellowing and chalking
  • Not resistant to biogenic sulphuric acid
 

Packaging

Part A (Isocyanate)

212 kg drums ~189 L

Part B (Amine)

191 kg drums ~189 L

Colour

Part A

Clear

Part B

Grey

Grey, approximately RAL 7005

Product Details

Sustainability / Certifications / Approvals

SUSTAINABILITY

According USGBC LEED Rating Sikalastic®-841 ST conforms to the requirements of LEED EQ Credit 4.2: Low – Emitting Materials: Paints & Coatings SCAQMD Method 304-91 VOC Content < 100 g/l

APPROVALS / CERTIFICATES

  • 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 accoring to 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
Product Information

Composition

Pure Polyurea

Shelf life

12 month from date of production

Storage conditions

The packaging must be stored properly in original, unopend and undamaged sealed packaging, in dry conditions at temperatures between +5 °C and +30 °C. Protected from direct sunlight.

Density

Part A

~1.12 kg/l

Part B

~1.01 kg/l

Density values determined at +20 °C

Solid content

~99 %

Viscosity

Temperature

Part A

Part B

+20 °C

~1200 mPas

~800 mPas

+25 °C

~750 mPas

~500 mPas
Technical Information

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

Application Information

Mixing Ratio

Part A : Part B = 1 : 1 (Volume)

Layer Thickness

> 2 mm

Product Temperature

> +65 °C

Ambient Air Temperature

+1 °C min. / +50 °C max.

Relative Air Humidity

< 85 %

Substrate Temperature

+1 °C min. / +50 °C max.

≥ 3 °C above dew point, beware of condensation.

Curing Time

24 h / +20 °C

Gel time

~11 s / +20 °C

Waiting Time / Overcoating

1 to 2 min / +20 °C
Consumption

Consumption

~1.05 kg / m² / mm
Application steps

APPLICATION INSTRUCTIONS

Dose and mix with a suitable air driven or electrical plural component heated spray equipment. Both components must be heated up to > +65 °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.

Please note: always apply test area first.

SUBSTRATE PREPARATION

The surface must be sound, of sufficient strength, clean, dry and free of dirt, oil, grease and other contamination. Depending on the material the substrate must be primed or mechanically cleaned.

Grinding may be necessary to level the surface. Suit-able substrates are such as: Concrete and metal.

Substrate Pre-Treatment.

Substrate
Primer
Cementitious substrates

Sika® Concrete Primer or Sikafloor®-
161 lightly broadcast with quartz
sand, 0.3 – 0.8 mm, for example
Sikadur®-507

Metals
Ferrous or galvanised metals, lead,
copper,aluminium, brass or stainless
stee

Sikalastic® Metal Primer

For the consumption rates and waiting time / overcoating please refer to the PDS of the appropriate primer.

Other substrates must be tested for their compatibility. If in doubt, apply a test area first.

CLEANING OF EQUIPMENT

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.

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