Product Data Sheet Show all documents

Sikalastic®-8440

Polyurea spray applied chemical resistant membrane

Sikalastic®-8440 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 containing high levels of acid.

  • Seamless
  • 100 % solids
  • 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
  • Excellent chemical and abrasion resistance
  • Resistant to biogenic sulphuric acid
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Product Data Sheet Show all documents

Usage

  • Abrasion resistant protective coating in industrial and manufacturing facilities
  • Tank, bund and pit lining in sewage and waste water treatment plants
  • Areas where biogenic sulphuric acid is present
  • Internal lining of bio-mass ponds
 

Advantages

  • Seamless
  • 100 % solids
  • 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
  • Excellent chemical and abrasion resistance
  • Resistant to biogenic sulphuric acid

Packaging

Component A (ISO)

225 kg drum

Component B (resin)

190 kg drum

Colour

Standard colour red brown.

When product is exposed to direct sunlight there may be some discolouration and colour variation, this has no influence on the function and performance of the coating.

Product Details

Product Information

Chemical Base

Pure Polyurea

Shelf Life

Component A (ISO)

6 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.

Density

Component A (ISO)

~1,15

Component B (resin)

~1,00

Solid content by mass

~100 %
Technical Information

Shore D Hardness

~60

(EN ISO 868:2005)

Mechanical resistance

< 40 mg

H22/ 1000/ 1000

< 40 mg

CS17/ 1000/ 1000

Tensile Strength

~ 13 MPa

(ISO 527-1:2012)

Tensile adhesion strength

> 1,5 MPa to concrete

Tear Strength

~80 KN/m

(ISO 34-1:2010)

Chemical Resistance

Resistant to many chemicals. Contact Sika Technical Service for specific information.

Application

Application Information

Mixing Ratio

Comp. A : Comp. B = 1 : 1

Layer Thickness

≥ 2 mm

Product Temperature

Comp. A (ISO): +60 - +70 °C

Comp. B (resin): +60 - +70 °C

Ambient Air Temperature

+5 °C min. / +50 °C max.

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.

Substrate Temperature

+5 °C min. / +50 °C max.

Surface must be free from condensation

Substrate Moisture Content

Refer to product data sheet of the used primer

Curing Time

24 h at +23 °C

Gel time

4–7 seconds

Waiting Time / Overcoating

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) shall be sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum tensile strength of 1,5 N/mm2.

Substrates shall be clean, dry and free of all contaminants such as dirt, oil, grease, coatings and surface treatments, etc.

SUBSTRATE PREPARATION

Cementitious substrates shall 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®-8440

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

 

MIXING

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 (resin) using a drum stirrer until a homogenous colour is obtained.

APPLICATION

Sikalastic®-8440 is spray applied in a continuous operation to achieve a consistent thickness and surface finish.

CLEANING OF TOOLS

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

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