Sikalastic® M 689 AE

• WRAS drinking water approval no. 240455060: April 2024 for use with hot water up to 70 °C.  

~100 % polyurea

Part A: 12 months from date of production
Part B: 9 months from date of production

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

Values at +25°C

Membrane thickness: 1.5 mm

Resistant to many chemicals. Contact Sika Technical Services for additional information.

100 : 100 by volume
100 : 112 by weight

Max. 85 %

Min. 5 °C / Max. 50 °C

≤ 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).

5 - 7 seconds

~30 seconds at 25 °C

~12 hours at 25 °C

~30 minutes at 25 °C

Sikalastic® M 689 AE is normally applied at 2.2 - 2.8 kg/m². This corresponds to a thickness of approx. 2.0 - 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.

Mixing and spraying

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

Contact Sika Technical Services for recommendation.

The preparation of the substrate and the use of the appropriate primer are of paramount importance. All surfaces to which Sikalastic® M 689 AE 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 refer to particular primer product 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.

Dose and mix with suitable air driven or electrical twopart 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.

Sikalastic® M 689 AE 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 AE 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 AE 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.

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