Product Data Sheet
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Sikalastic®-8850

Polyurea spray applied chemical resistant membrane

Sikalastic®-8850 is a 2- part, pure polyurea, hot spray applied, elastic, very fast curing, waterproofing membrane. Provides a seamless, abrasion and  chemical resistant finish for liquid retaining structures. Thickness ≥ 2 mm.

  • Seamless
  • Very fast reactivity and curing time
  • Almost immediate return-to-service time
  • Applicable in temperatures from -20 °C to +50 °C
  • Performs in constant dry temperatures from -30 °C to +100 °C
  • Good crack bridging properties
  • Good chemical and abrasion resistance
  • Not resistant to biogenic sulphuric acid
Product Data Sheet
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Usage

Concrete:
  • Abrasion resistant protective coating in industrial and manufacturing facilities
  • Waterproofing for cut and cover structures, submersed structures, walkways and balconies, 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
Steel:
  • Truck bed lining
  • Wear resistant coating on hydraulic steel structures
 

Advantages

  • Seamless
  • Very fast reactivity and curing time
  • Almost immediate return-to-service time
  • Applicable in temperatures from -20 °C to +50 °C
  • Performs in constant dry temperatures from -30 °C to +100 °C
  • Good crack bridging properties
  • Good chemical and abrasion resistance
  • Not resistant to biogenic sulphuric acid

Packaging

Component A (ISO)

200 l drum (225kg)

Component B (Resin)

200 l drum (205kg)

Product Details

Product Information

Chemical Base

Pure Polyurea

Shelf Life

Component A (ISO)

12 months from date of production

Component B (Resin)

12 months from date of production

Storage Conditions

Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.

Density

Component A (ISO)

~1,00

Component B (Resin)

~1,15

Solid content by weight

~100 %

EN 13823:2010
Technical Information

Shore D Hardness

~48

(EN ISO 868:2005)

Tensile Strength

15–20 MPa

(ISO 527-1:2012)

Tensile Adhesion Strength

≥ 1,5 MPa (to concrete)

(EN 1542:1999)

Tear Strength

90–110 KN/m

(ISO 34-1:2010)

Crack Bridging Ability

Class A 4 (static)

(EN 1062-7:2005)

Class B3,1 (dynamic)(EN 1062-7:2005)

Chemical Resistance

Sikalastic®-8850 is resistant to de-icing salts, bitumen, alkalis, fresh- and ground water and various chemicals. Contact Sika Technical Service for specific information.

Application

Application Information

Mixing Ratio

Comp. A : Comp. B = 1 : 1

Layer Thickness

~2mm

Relative Air Humidity

≤ 85 %

Dew Point

Beware of condensation.

The substrate and uncured coating finish must be at least 3 °C above dew point to reduce the risk of condensation.

Product Temperature

Comp. A (ISO)

+60 °C min. / +80 °C max

Comp. B (Resin)

+60 °C min. / +80 °C max

Ambient Air Temperature

+5 °C min  / +50 °C max

Substrate Temperature

+5 °C min. / +50 °C max

Substrate Moisture Content

Refer to primer product data sheet

Curing Time

Fully cured after 24h / +23 °C

Waiting Time / Overcoating

For overcoating with Sikalastic®-8850 or UV resistant top coats allow:

Substrate Temperature

Minimum

Maximum

10 °C

10 - 15 s

7 h

23 °C

10 - 15 s

6 h

30 °C

10 - 15 s

5 h
Consumption

Consumption

~1 kg/m²/mm
Application steps

SUBSTRATE QUALITY

Cementitious substrates (concrete) must be structurally sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum tensile strength of 1,5 N/mm2.

Cementitious substrates and steel surfaces must be clean, dry and free of all contaminants such as dirt, oil, grease, existing coatings and surface treatments, etc.

SUBSTRATE PREPARATION

Cementitious substrates

Must be prepared mechanically using suitable abrasive blast/water jetting cleaning equipment to remove cement laitance and achieve an open textured surface profile suitable for the product thickness.

Weak cementitious substrates must be removed and surface defects such as blow holes and voids must be fully exposed.

Priming, repairs to the substrate, filling of cracks, blowholes/voids and surface levelling must be carried out using appropriate products from the Sikafloor®, Sikadur® and Sikagard® range of materials. Products must be cured before applying Sikalastic®-8850.

 

Steel surfaces

Must be prepared mechanically using suitable abrasive blast/water jetting cleaning equipment to to the requirements of the proposed manufacturer's corrosion protection system.

All dust, loose and friable material must be completely removed from all surfaces before application of the product, preferably by vacuum extraction equipment.

After preparation, apply a non-solvent based protective coating i.e. SikaCor® 146 DW.

MIXING

Dose and mix with a suitable air driven or electrical plural component heated spray equipment.

Both components must be heated up to the temperatures: Comp. A ( ISO): +60 °C, Comp. B (Resin): +80 °C.

The accuracy of mixing and dosage must be controlled regularly with the equipment. Thoroughly stir part B  (Resin) using a drum stirrer until a consistent colour is obtained.

CLEANING OF TOOLS

Clean all tools with Thinner C immediately after use. The application equipment has to be cleaned and filled with Mesamoll. Hardened material can only be removed mechanically.

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