Sikalastic®-632 R

One component moisture triggered pure polyurethane

9 months from the date of production

Store in dry condition in original, unopened and undamaged packaging at temperature between +10 °C and +30 °C.

~ 90 % (+23 °C / 50 % r.h.)

~ 82.3 % (+23 °C / 50 % r.h.)

Substrate Priming

* Color change to cured Sikalastic®-632 R may occur

Build-up

* local reinforcement is recommended with Sikalastic® Fleece, Sika® Reemat, Sika® Flexitape and/or Sika® Flexistrip in areas with high movement, irregular substrate or to bridge cracks, joints and seams on the substrate.

** consumption figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level and wastage etc.

+10 °C min. / +40 °C max.

85 % r.h. max.

Beware of condensation!

The substrate and uncured membrane temperature must be at least 3 °C above the dew point to reduce the risk of condensation or blooming on the membrane finish.

+10 °C min. / +45 °C max.

< 4 % pbw moisture content. Test method: Sika®-Tramex meter, CM – measurement or oven-dry-method. No rising moisture according to ASTM (Polyethylene-sheet).

Concrete / Cementitious Substrate
New concrete should be cured for at least 28 days. Inspect the concrete, including upstands, all areas should be hammer tested. Concrete must be suitably finished by wood float or steel pan. The surface finish must be uniform and free from defects such as laitance, voids or honeycombing.

Mortar joints must be sound and preferably flush pointed. Ensure all ceramic tiles are sound and securely fastened, replacing obviously broken or missing sections.

Asphalt / Bituminous Sheet
Volatiles and organics oils in the sheets can cause bleeding and slight non-detrimental staining. The asphalt must be carefully assessed for moisture and/or air entrapment, grade and surface finish prior to any coating works being carried out.

Sikalastic®-632 R is designed for rapid curing, therefore the material will react with the humidity of the air. Skin formation in the pail starts within 1 hour of opening the pail in hot climate conditions.

Before applying Sikalastic®-632 R on Sikalastic®-632 R allow:

Note: times are approximate and will be affected by the layer thickness, the substrate temperature.
* after 2 days the surface must be cleaned and primed prior to the application of another layer of Sikalastic®-632 R.

* In case of early rain superficial surface damage has to be expected without affecting the integrity of the coating.

Note: The initial surface tackiness of the cured Sikalastic®-632 R will disappear within 2 weeks of application.

Concrete Cementitious Substrate

• Cementitious or mineral based substrates must be prepared mechanically using abrasive blast cleaning or scarifying equipment to remove cement laitance and to achieve an open textured surface. Loose friable material and weak concrete must be completely removed and surface defects such as blowholes and voids must be fully exposed. High spots must be removed by e.g. grinding.
• Repairs to the substrate, filling of joints, blowholes/voids and surface levelling must be carried out using appropriate products from the Sikaflex®, Sikafloor®, Sikadur® and Sikagard® range of materials.
• Outgassing is a naturally occurring phenomenon of concrete that can produce pinholes in subsequently applied coatings. Primer will be used on porous concrete and cementitious substrates to block outgassing avoiding pin holing.

Asphalt / Bituminous Sheet

• Power wash as required. All major cracks should be sealed to allow continuity of the Sikalastic®-632 R system. Asphalt must be carefully assessed for moisture and/ or air entrapment, grade and surface finish prior to any coating works being carried out. Treat blisters by star cutting and removing any underlying water. Allow to dry and re-adhere using torch.

Any other substrate

• For any other substrate to be waterproofed with Sikalastic®-632 R please contact Sika Technical Service team for assessment and substrate preparation proposal.

Prior the application of Sikalastic®-632 R the priming coat if used must have cured tack-free. For the waiting time / overcoating please refer to the PDS of the relevant primer. Damageable areas (handrails, etc) have to be protected with tape or plastic wrapping.

Application can be done with a soft bristle brush, or with a solvent resistant, “non-shedding” synthetic nylon roller. Contact Sika Technical Service team for application using airless spray.

Detailing
Always begin the installation with the details prior to the installation of the horizontal areas. Follow same process as reinforced system.

Coating System
Apply the first layer of Sikalastic®-632 R maintaining a wet edge to ensure a seamless membrane. Once the first layer has cured enough (see overcoating time window) apply the second layer of Sikalastic®-632 R.

Reinforced System
Apply the first layer of Sikalastic®-632 R maintaining a wet edge to ensure a seamless membrane. Roll-in the reinforcement Sika Reemat or Sikalastic® Fleece and overlap by minimum 5 cm. The roller may require only a little bit of extra material to keep wetted but no further significant material is added at this stage. Once the first layer has cured enough (see overcoating time window) apply the second layer of Sikalastic®-632 R.

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