Product Data Sheet Show all documents

SikaTop®-578 Seal

(former MSeal 578)

An elastomeric, highly flexible cementitious waterproof coating for concrete and masonry structures

SikaTop®-578 Seal is a two-component, cement based, flexible coating for waterproofing and protection of concrete and masonry structures. Component A is a powder blend of Portland cements, selected silica sands and modifying agents. When mixed to a slurry consistency with Component B, liquid, an acrylic polymer emulsion, it can be easily applied by brush or roller. Suitable for use in hot and tropical climatic conditions. 

  • High performance: accommodates movement
  • Excellent elongation at failure
  • Excellent mechanical characteristics
  • Easy application due to product’s consistency
  • Compatible with ceramic, mosaic and natural stone coverings
  • Excellent adhesion
  • Retains flexibility when submerged
  • Flexible under all environmental conditions
  • Good chemical resistance against soft water, domestic waste water, manure or other liquids moderately aggressive to mineral substrates
Product Data Sheet Show all documents

Usage

  • Suitable for internal and external applications.
  • Waterproofing and protection of  terraces, balconies, bathrooms and other wet areas where tiles are to be installed directly on top of the membrane using a proprietary tile adhesive.
  • Waterproofing of water retaining and hydraulic structures.
  • Flexible protection of concrete structures subject to minor deformation under load.
  • Protection of concrete structural elements repaired with products from the SikaEmaco® or Sikadur® ranges against the penetration of carbon dioxide.
  • Protection of concrete surfaces from sea-water and deicing salts, chloride attack and carbonation.
 

Advantages

  • High performance: accommodates movement
  • Excellent elongation at failure
  • Excellent mechanical characteristics
  • Easy application due to product’s consistency
  • Compatible with ceramic, mosaic and natural stone coverings
  • Excellent adhesion
  • Retains flexibility when submerged
  • Flexible under all environmental conditions
  • Good chemical resistance against soft water, domestic waste water, manure or other liquids moderately aggressive to mineral substrates

Packaging

Supplied in 30 kg unit  

Comp. A - Powder20 kg
Comp. B - Liquid10 kg

Colour

Grey

Product Details

Sustainability / Certifications / Approvals

CERTIFICATES AND TEST REPORTS

SikaTop®-578 Seal meets the requirements defined by EN 1504-9 and EN 1504-2. 

 
Product Information

Shelf life

12 months from date of production

Storage conditions

Store in original unopened packaging in a cool and dry condition between +5°C and +35°C. Protect from direct sunlight, heat and moisture. Avoid excessive compaction. Do not stack pallets.

Density

~1.6 kg/l (fresh mortar at +20°C)
Technical Information

Crack bridging ability

Static crack-bridging 

(after 28 days at +20°C and 50% R.H)

Class A5 
(> 2.5 mm)

Dynamic crack-bridging

(at +20°C expressed as resistance to cracking cycles)

class B4.2 

at +23°C> 1 mm

Tensile adhesion strength

~0.8 N/mm2

(on concrete surface, at 28 days, +20°C and 50% R.H.)

and

(Thermal compatibility to freeze/thaw cycles with de-icing salts, measured as Adhesion)

(EN 1504-2 / EN 1542)

Initial adhesion strength~1 N/mm2
Adhesion after application of heat source~1.3 N/mm2
Adhesion after freeze-thaw cycles~0.7 N/mm2
Adhesion after immersion in basic water~0.7 N/mm2

Elongation at break

~120 %

(after 28 days at +20°C and 50% R.H.)

(ASTM D412)

Watertightness

1.5 bar - no penetration

(for 7 days of positive lift)

(EN 1504-2 / EN 14891-A.7)

Water permeability

~ 0.05 kg/m2·h0.5

(Expressed as capillary absorption)

(EN 1504-2 / EN 1062-3)

Permeability to water vapour

Class 1 (SD < 5)

(Equivalent air thickness)

(EN 1504-2 / EN ISO 7783-1)

Permeability to carbon dioxide

> 100 m

(diffusion in equivalent air layer thickness CO2(SD) )

(EN 1504-2 / EN 1062-6)

Resistance to UV exposure

Resistant ( 500 hrs)

(ASTM G154-16)

 

Application

Application Information

Ambient air temperature

+8°C to +45°C

Pot Life

~60 min. (at 20°C)
Consumption

Consumption

~1 L / m2 / mm per layer (min. 2 layers recommended)

An additional 0.5 kg/m² is required when embedding approved mesh

Yield

~19 L / 30 kg unit
Application steps

SUBSTRATE PREPARATION

The surface to be coated must be clean and sound. Remove all traces of formwork, release agents, previous coatings, laitance, organic growth and any other contaminants that may affect the bond adversely. Suitable cleaning methods include ultra high-pressure water jetting and grit blasting. Aggressive percussive methods such as scabbling or scarifying are not recommended unless followed by grit blasting, wire brushing or high-pressure water jetting. After the above treatment, surfaces must be thoroughly rinsed with clean potable water to remove all dust and loose particles.  
Cracks bolt holes and large surface defects must be cut out and filled solid with SikaTop®-590 Seal or one of the SikaEmaco® range of repair material. 
Small blowholes in the concrete should be filled with a thixotropic mix of SikaTop®-578 Seal Powder with reduced liquid content. 

 

MIXING

SikaTop®-578 Seal is supplied in premeasured units and should be mixed on site utilising clean containers.
Slowly add the powder to the liquid and mix, using a slow speed drill fitted with a suitable paddle.

MIX AND USE. Do not mix more material than can be used in one hour.

APPLICATION

Apply SikaTop®-578 Seal in two coats at minimum 1 mm thickness per coat. Apply subsequent coats once the initial coat has dried.
SikaTop®-578 Seal must be reinforced with mesh across all construction joints and cracks. The reinforcing mesh may be either 100 % polypropylene or an alkali resistant glass-fibre mesh, depending on which particular enhanced tensile properties are required.
Please consult your local Sika® Technical Service Representative for further advice on the correct selection of mesh.

CURING TREATMENT

Under hot or excessive drying conditions adequate protective shielding should be foreseen. In cold, humid or unventilated areas it may be necessary to leave the application for a longer curing period.

SikaTop®-578 Seal needs to cure under dry-air conditions. Additional heating and/or ventilation can assist proper curing.

Do not use dehumidifiers during curing periods. 

CLEANING OF EQUIPMENT

Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically. 

 

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