Product Data Sheet Safety Data Sheet Show all documents

Sika BlackSeal® Lastic

Rubberised bituminous waterproofing coating

Sika BlackSeal® Lastic is a rubberised bitumen emulsion coating, which is used as a stand alone coating or in conjunction with Sika BlackSeal membrane (polyprop fabric) to form a waterproofing system.

  • Applied by with brush, roller or trowel
  • Supplied ready to use
  • No primer needed
  • Easily applied
  • Non-sag on vertical surfaces
  • Remains flexible at low temperature
  • Crack-bridging
  • Non-toxic
Product Data Sheet Safety Data Sheet Show all documents

Usage

Waterproofing for various applications such as:
  • Flat roof waterproofing
  • Waterproofing of water retaining structures
  • Flashing of roofs
  • Gutters
  • Parapet walls
  • Sealing of fixings, lap joints and roof screws
 

Advantages

  • Applied by with brush, roller or trowel
  • Supplied ready to use
  • No primer needed
  • Easily applied
  • Non-sag on vertical surfaces
  • Remains flexible at low temperature
  • Crack-bridging
  • Non-toxic

Packaging

5ltr and 20ltr containers

Colour

Pasty black

Product Details

Product Information

Chemical Base

Emulsion containing bitumen mastic

Shelf Life

12 months

Storage Conditions

Store in closed,sealed and undamaged packaging in dry conditions at temperatures between +5°C and +30°C. Protect from direct sunlight.

Density

~1.02kg/l

Solid content by volume

~47% by Vol.

 
Technical Information

Service Temperature

-30°C to 70°C dry

Application

Application Information

Layer Thickness

2mm max.

Ambient Air Temperature

+10°C min. / +35°C max

Substrate Temperature

+10°C min. / +35°C max

Substrate Moisture Content

<3%

Curing Time

Surface - dry after 3 hours at 23°C

Dependant on ambient temperature, substrate temperature, relative humidity and the thickness of the coating
Application steps

SUBSTRATE QUALITY

Substrate must be smooth, dry, free of dust, oil or grease and loose or friable particles. Surface defects including blowholes, voids, honeycombing, etc., in the concrete must be repaired with suitable Sika mortars before coating.

SUBSTRATE PREPARATION

Rinse concrete surfaces with clean water.
Clean contaminated substrates by suitable means including steam cleaning, high pressure water jetting, etc.
Concrete substrate:
Prime substrates with one part Sika® Blackseal Lastic diluted by one part water.
Metal surfaces:
After degreasing surface prime new galvanised surfaces with Sika® Blackseal Primer.
Old surfaces which have been effected by rust should be thoroughly cleaned and primed with a good metal etch primer.

 

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