Product Data Sheet Show all documents

Sikalastic®-680

Single Component Highly Elastic Polyurethane One Coat Waterproofing Membrane

Sikalastic®-680 is a single component, liquid applied polyurethane waterproofing membrane for concrete structures that will be covered by protective toppings. Sikalastic®-680 is flexible and provides a continuous seamless waterproofing membrane for a wide range of applications.

  • Excellent adhesion on concrete, render and masonry
  • High crack bridging ability
  • Good impact and abrasion resistance
  • Good chemical resistance
  • Non-toxic
  • Easy to use and quick drying
Product Data Sheet Show all documents

Usage

  • As waterproofing membrane on roofs, podiums, balconies, bathrooms, pools, tanks and planters
  • As waterproofing coat for external wall, basements and foundations
  • As water barrier under plasters, screeds or tiles
 

Advantages

  • Excellent adhesion on concrete, render and masonry
  • High crack bridging ability
  • Good impact and abrasion resistance
  • Good chemical resistance
  • Non-toxic
  • Easy to use and quick drying

Packaging

20 kg per pail

Colour

Black

Product Details

Product Information

Chemical Base

Polyurethane

Shelf Life

6 months from date of production

Storage Conditions

Stored properly in undamaged and unopened original sealed packaging in cool and dry conditions. Protect from direct sunlight and frost.

Density

Approx. 1.3 kg/litre

Solid Content

> 90 %
Technical Information

Shore A Hardness

40

Tensile Strength

Approx. 2 MPa

(ASTM D412)

Tensile Adhesion Strength

1.5 MPa (at 1.5 mm wet film thickness)

Tear Strength

Approx. 17 MPa

Application

Application Information

Ambient Air Temperature

+5 oC min. / +45 oC max.

Tack Free Time

Approx. 3 hours (@ 25 oC & RH 75 %)
Consumption

Yield

Standard Coating System

Approx. 1.8 kg/m2 (~ 1.5 mm wet film thickness) in one or more coats

      

Reinforced Coating System

Approx. 2.5 kg/m2 (~ 2 mm wet film thickness, embedded with Sika® Glass Fabric) in two or more coats

      

(Depending on surface profile and application method)
Application steps

SUBSTRATE PREPARATION

All substrates must be structurally sound, stable, dry and clean (compressive strength : min. 25 N/mm2 and cohesive strength : min. 1.5 N/mm2). Smooth shiny surfaces are to be roughened while uneven surface to be leveled or filled first. All surfaces should be free of sharp protrudings, loose materials, de-bonded coatings, curing membranes, release agents, wax residues, laitance, algae and moss, oils, dust, etc.

Structurally unsound layers and surface contaminants are to be mechanically removed by abrasive blasting, blast tracking, grinding or equivalent methods. Cracks and faulty joints should be repaired.

APPLICATION

Priming

On very absorbent surfaces, a primer coat (Sikafloor®-161 /  Sikafloor®-156) should be applied on the concrete surface prior to the application of waterproofing membrane.  Care should be taken to ensure the required membrane final dry film thickness is achieved.

   

Application Method / Tools

Sikalastic®-680 can be applied by brush, roller, trowel, squeegee or airless spray directly onto the treated substrate. Apply subsequent coats at different directions to the previous coat.

Before applying any coating, the previous coat must be touch dry. Subsequent coats should be applied within a max. period of 24 hours.

The finished membrane should be protected from damage by other trades.

CLEANING OF TOOLS

Clean all tools and application equipment with Sika® Thinner C immediately after use. Hardened and/or cured material can only be removed mechanically.

 

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