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Sikalastic®-841 ST

Third party certifications:
  • BBA Agrément Certificate

    BBA Agrément Certificate

    Certificate type

Sika Limited

Liquid applied pure polyurea membrane.

Jump to:
+44 (0)1707 394444 www.sika.co.uk

A two part, elastic, 100% solids, very fast curing pure polyurea liquid applied membrane with very good chemical resistance.

Should not be used in closed structures containing biogenic sulphuric acid Sikalastic®-841 ST can only be spray applied with special two part hot spray equipment.

Typical uses:

  • For waterproofing applications and anticorrosion applications on concrete and many other substrates.
  • Protective coatings.
  • Tank coatings and linings.
  • Bridge deck waterproofing.
  • Roof coatings.
  • Walkways and balconies.
  • Flooring and car parking decks.
  • Industrial and manufacturing facilities.
  • Landscape and water containment.
  • Power plants.
  • Sewage and waste water treatment plants.
  • Truck bed lining.


  • Very fast reactivity and curing time.
  • Almost immediate return-to-service time.
  • Applicable in temperatures from -15–70 °C.
  • Performs in constant dry temperatures from -30–100 °C.
  • 100% solids with zero VOC.
  • Excellent crack-bridging properties.
  • Good chemical resistance.
  • Low yellowing.
  • Good abrasion resistance.

General information

Uniclass 2015

Pr_35_31_68_47 Liquid tanking resinsPrimary


J30/150 Hot applied damp proofing

J30/20 Hot applied damp proofing

Specification data - Liquid tanking resins

Product Reference

Sikalastic®-841 ST

Standard product features


  • ISO Part A: clear liquid.
  • Resin Part B: amber or grey liquid.

Grey ~ RAL 7005 or un-pigmented (yellowish).

Chemical base:

Pure Polyurea.

Tensile strength to DIN 53504:

> 15 N/mm².

Shore D hardness to DIN 53505:


Elongation at break:


Consumption/ dosage:

Varies depending on substrate, consult technical datasheet for further details.

Third party certifications
  • 13/H204