Sikalastic®-680

Single Component Highly Elastic Polyurethane One Coat Waterproofing Membrane

Sikalastic®-680

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.

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

Overview

Usage

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

Advantages

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

Packaging

20 kg per pail

Colour

Black, grey

Product Details

Chemical Base

Polyurethane

Shelf Life

9 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. 1.5 kg/litre (± 0.05)

Shore A Hardness

60 ( ±5 )

Tensile Strength

Approx. 2 MPa

Tensile Adhesion Strength

> 1 MPa

Tear Strength

Approx.  15 N/mm

Application

Ambient Air Temperature

+5 oC min. / +40 oC max.

Tack Free Time

Approx. 4 hours (@ 25 oC & RH 75 %)

Yield

Standard Coating System

Approx. 2.0 kg/m2 (~ 1.3 mm wet film thickness) in one or more coats

      

Reinforced Coating System

Approx. 2.5 kg/m2 (~ 1.6 to 1.7 mm wet film thickness, embedded with Sika® Glass Fabric) in two or more coats

      

(Depending on surface profile and application method)

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 coat ings, 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 con crete surface prior to the application of waterproofing membrane. Care should be taken to ensure the re quired 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 direc tions 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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