Product Data Sheet Show all documents

Sikalastic® M 689 R ME

A high elastic, ultra-fast curing, spray applied pure polyurea membrane for use in roof waterproofing applications 

Sikalastic® M 689 R ME is a total solids, two-component roof waterproofing membrane. It is highly reactive and can only be applied by special two-component hot spray equipment.     Suitable for use in hot and tropical climatic conditions. 

  • Low viscosity
  • Excellent bond to substrate
  • Easy application to complicated details
  • Rapid curing
  • Continuous membrane, monolithic – no laps, welds or seams 
  • Resistant to standing water
  • Fully bonded to substrate, can be applied to a wide range of substrates with the appropriate primer
  • High impact resistance
  • High elasticity and crack bridging capability
  • Thermoset – does not soften at high temperatures
 
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Product Data Sheet Show all documents

Usage

Sikalastic® M 689 R ME is used in a variety of roof waterproofing applications, especially where a high degree of mechanical resistance is required:    
  • For use as a waterproofing membrane on flat and pitched roof structures.
  • For use as a waterproofing membrane underneath planting or hard landscaping on podium areas.
  • For use as a waterproofing membrane for concrete structures and on non-trafficked concrete areas.
  • Where color stability is required, polyurea membrane can be overcoated with UV protective top coat.
 
Additionally, Sikalastic® M 689 R ME can be applied on:    
  • Flat and architectural roofs.
  • Horizontal and vertical substrates.
  • Internal and external areas.
  • Concrete or metal substrates.

Advantages

  • Low viscosity
  • Excellent bond to substrate
  • Easy application to complicated details
  • Rapid curing
  • Continuous membrane, monolithic – no laps, welds or seams 
  • Resistant to standing water
  • Fully bonded to substrate, can be applied to a wide range of substrates with the appropriate primer
  • High impact resistance
  • High elasticity and crack bridging capability
  • Thermoset – does not soften at high temperatures
 

Packaging

Part A (Polyamine): ~200 kg in 200 L drums 

Part B (Isocyanate): ~225 kg in 200 L drums 

Product Details

Product Information

Composition

~100 % polyurea 

Shelf life

Part A: 12 months from date of production.

Part B: 12 months from date of production.

Storage conditions

Store in a dry area in original sealed packaging at temperatures between +15 °C and +25 °C. Protect from direct sunlight, heat and moisture.

Density

Values at 25°C

Part A

~1.00 kg/l

Part B

~1.12 kg/l
Technical Information

Shore A hardness

~90

(ASTM D2240)

Shore D Hardness

~40

(ASTM D2240)

Tensile strength

~16 N/mm² 

(ISO 527-1)

Elongation

~340 %

(ISO 527-1)

Tensile adhesion strength

Concrete

≥ 3 N/mm2 

(or concrete failure)

Metal

≥ 3 N/mm2 

Tear strength

~80 N

(DIN 53515)

Membrane thickness: 1.5 mm

Crack bridging ability

3.2 mm

(ASTM C1305)

Service temperature

Min. 0°C / Max. 80°C

Application

Application Information

Mixing ratio

100 : 100 by volume 

100 : 112 by weight 

Relative air humidity

Max. 85 %

Substrate temperature

Min. 5°C / Max. 50°C

Substrate moisture content

≤ 4 % parts by weight.
The following test methods can be used: Sika®-Tramex meter, CM-measurement or Oven-dry-method. No rising moisture according to ASTM
(Polyethylene-sheet).

Tack free time

~30 seconds at 25°C

Applied product ready for use

~12 hours at 25°C

Gel time

5 - 7 seconds
Consumption

Consumption

Sikalastic® M 689 R ME is normally applied at 1.7 - 2.8 kg/m². This corresponds to a thickness of approx. 1.5 - 2.5 mm.
 

Note: These figures are theoretical and do not include for any additional material required due to surface porosity, surface profile, variations in level and wastage.
Application steps

EQUIPMENT

Mixing and spraying

  • Drum stirrer
  • Air driven or electrical 2-Component heated spray equipment


Contact Sika Technical Services for recommendation.

 

SUBSTRATE PREPARATION

The preparation of the substrate and the use of the appropriate primer are of paramount importance. All surfaces to which Sikalastic® M 689 R ME is applied should be sound, clean and dry and free from oil or grease, loose particles and any other substances which may impair adhesion. For substrate pre-treatment prior to the primer application see primer technical data sheet. 


Concrete and cementitious screeds: 

Concrete and other cementitious substrates must have a minimum pull off strength of 1.5 N/mm². Any laitance present on the surface must be removed mechanically. Shot blasting is the preferred method. Release oil and other contaminants which may impair adhesion must be removed prior to the application of the primer. 

Metal substrate: 
Should be sand blasted to a Sa 2 ½ finish prior to application of the primer. 

MIXING

Dose and mix with suitable air driven or electrical two-part hot spray equipment. The accuracy of mixing and dosage must be controlled regularly with the equipment. 
Stir well PTA drums before use to homogenise the content. Precondition the membrane components to the correct temperature 70-80°C prior to application. 
Check mix ratios are correct at the start of spraying and regularly throughout the spraying procedure. 

 

APPLICATION

Sikalastic® M 689 R ME can only be applied by means of a suitable two component heated, high pressure, proportioning spray equipment (e.g. Graco® or any other suitable). The choice of machine depends to a large extent on the type and size of work contemplated. For advice, please contact Technical Service Department. 
Sikalastic® M 689 R ME should only be applied to properly prepared substrates. For best results substrate and air temperature should be in a range 5-40°C. 
Sikalastic® M 689 R ME should be applied within the recommended temperature and relative humidity limits. The temperature of the substrate should be min. 3°C above the dew point.

Due to the fast reaction it is possible to rapidly build thicknesses. 
Surrounding areas should be protected from overspray by masking off. Care should be taken to prevent spray mist being carried by wind by suitable barrier. 

CLEANING OF EQUIPMENT

Re-useable tools should be cleaned carefully with a suitable thinner (Xylene / MEK / Acetone). Hardened material can only be removed mechanically.

 

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