Product Data Sheet Show all documents

Sikalastic® M 678

(former MSeal M 678)

Rapid curing, chemical resistant, elastomeric waterproofing membrane

Sikalastic® M 678 is a solvent free, two component, high performance polyurea hybrid based waterproofing membrane, with high resistance to common chemicals. Using a specially designed spraying machine, the two components are pre- heated and spray applied, to a rapid curing, elastomeric, waterproofing membrane.

  •  Fast reacting - Rapid installation. Does not run when applied on vertical surfaces
  •  Seamless - No risk of leaky seams and laps.
  • Spray applied - Fast installation on large surfaces; easy application on complex details.
  • Fully bonded - Eliminates water collection behind membrane even if punctured.
  •  High tensile strength - Excellent ability to accept movements without rupturing.
  • Elastomeric - Excellent crack-bridging ability.
  • High tear resistance - Minimised risk of damage to membrane in service.
  • Low Tg (Glass Transition Temperature)  of -20˚C - Remains elastomeric at very low temperatures. Performance unaffected in below freezing conditions.
  • Solvent-free - Improved safety.
  • Potable water contact approved – suitable for tanks containing drinking water
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Product Data Sheet Show all documents

Usage

Sikalastic® M 678 is recommended for waterproofing of large structures exposed to aggressive waters, containing potable water and other containment structures.
Typical application areas include:
• Water containment areas.（potable and contaminated）
• Primary & Secondary containment tanks
• Waste water treatment tanks
• Protection & waterproofing of infrastructures.  

Advantages

  •  Fast reacting - Rapid installation. Does not run when applied on vertical surfaces
  •  Seamless - No risk of leaky seams and laps.
  • Spray applied - Fast installation on large surfaces; easy application on complex details.
  • Fully bonded - Eliminates water collection behind membrane even if punctured.
  •  High tensile strength - Excellent ability to accept movements without rupturing.
  • Elastomeric - Excellent crack-bridging ability.
  • High tear resistance - Minimised risk of damage to membrane in service.
  • Low Tg (Glass Transition Temperature)  of -20˚C - Remains elastomeric at very low temperatures. Performance unaffected in below freezing conditions.
  • Solvent-free - Improved safety.
  • Potable water contact approved – suitable for tanks containing drinking water

Packaging

Sikalastic® M 678 Part A and B is supplied in 200kg drums.

Product Details

Product Information

Chemical Base

Hybrid Polyurea

Shelf Life

12 months from date of production

Storage Conditions

Store out of direct sunlight, clear of the ground on pallets protected from rainfall

Density

Part A

1.03 kg/L (at 25°C)

Part B

1.10 kg/L (at 25°C)

Viscosity

Part A

1000 ± 150 cps(at 25°C)

Part B

1250 ± 200 cps (at 25°C)

 
Technical Information

Shore A Hardness

> 85 

(DIN 53505)

Tensile Strength

>16 N/mm2

(DIN 53504)

Tear Strength

> 70 kg/cm

(ASTM D624)

Resistance to Weathering

No cracks ,No Delamination when tested for accelerated weathering in UV Chamber(QUV) for upto 1000 hrs 

Application

Application Information

Mixing Ratio

Part A : Part B = 1:1 (By Volume)

Product Temperature

To be heated to 65-70 °C

Ambient Air Temperature

+10 °C min. / + 40 °C max.

Relative Air Humidity

Maximum upto 85 %

Dew Point

Beware of condensation.
The substrate and uncured applied membrane must be at least +3 °C above dew point.

Substrate Temperature

+10 °C min. / + 40 °C max.

Substrate Moisture Content

≤ 4 % parts by weight.
 

Gel time

≈ 6-10 secs

Tack Free Time

≈ 60-120 secs
Consumption

Consumption

Sikalastic® M 678 is applied approximately at 1.05 –2.1 kg/m2 depending on the substrate.This corresponds to a cured film thickness(DFT) of approx. 1.0 – 2.0 mm. Details, corners require a higher coverage rate up to 4.0 kg/m2or more.
Application steps

APPLICATION INSTRUCTIONS

For detailed information on application, please obtain a copy of the “Application Guide for Sikalastic® M 678” from our Technical Services team.

Some tips for optimal performance

  •  For optimum chemical and mechanical performance thickness’s greater than 1.5 mm should be used.
  • For optimum spray results the material should be heated to 60-70 °C.
  • Store Sikalastic® M 678 cool conditions in hot weather and warm conditions in cold weather.
  •  Repair voids, cracks and unevenness in substrates before application.
  • Remove all surface contaminants and ensure substrate is dry.
  •  Avoid application during rain.
  •  Agitate Part A before application.
  • Apply by spraying uniformly to recommended thickness using recommended spray machine.

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