Sikalastic®-853 R AP
Sikalastic®-853 R AP is a 2-part, hybrid polyurea, hot spray applied, crack-bridging, roof waterproofing membrane. It requires an aliphatic top coat when applied to fully exposed roofs.
- Fast curing, seamless finish
- Good elasticity and elongation at break
- Fast application
- Applied by 2-Component hot spray equipment
- Easily detailed around complex geometries
- Good adhesion to many substrates with the appropriate primers
- Thickness: ~1,5–2,0 mm
Usage
Designed for the following waterproofing applications:- Flat and sloping fully exposed roofs to UV, protected by an aliphatic topcoat
- New construction and refurbishment projects
- Balcony and terrace decks underneath a protective layer (i.e. ballast, paving slabs)
- Waterproofing membrane for concrete, metal, pedestrian decks, stadium seating floor application
- For exterior use only
Advantages
- Fast curing, seamless finish
- Good elasticity and elongation at break
- Fast application
- Applied by 2-Component hot spray equipment
- Easily detailed around complex geometries
- Good adhesion to many substrates with the appropriate primers
- Thickness: ~1,5–2,0 mm
Packaging
| Part A (Isocyanate) | 200 kg drum |
| Part B (Polyol mix) | 175 kg drum |
| Part C (Sika® Toner PU) | 15 kg container |
Refer to current price list for packaging variations
Colour
| Part A | ~Clear / brownish |
| Part B | ~Amber |
| Part C | Grey No.22 (~RAL 7011) |
Product Details
APPROVALS / CERTIFICATES
- Sikalastic®-853 R AP is in conformance with JIS A 6021
Composition
Polyurethane/Polyurea Hybrid
Shelf life
12 months from date of production
Storage conditions
Product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.
Density
| Part A | 1,0 kg/l |
| Part B | 1,0 kg/l |
| Part C | 1,25 kg/l |
| Mixed resin | 1,01 kg/l |
Values at +23 °C
Solid content
>99 %
System structure
Sikalastic®-853 R AP roof waterproofing systems
Note: Sikalastic®-853 R AP can be applied in different roof system build ups for concrete, metal or asphalt substrates. Contact Contact Sika Technical Services for additional information.
| Layer | Product | Consumption |
| 1. Primer | Depending on the substrate (Concrete, Metal, Asphalt) | Refer to individual Product Data Sheet |
| 2. Base Coat | Sikalastic®-853 R AP (coloured) | ~2,00 kg/m2 |
| 3. Top Coat | Sikalastic® ExcelTop High Reflection | ~0,2 kg/m2 |
| Sikalastic® U-Coating | ~0,2 kg/m2 |
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level and wastage, etc.
Primers
| Substrate | Primer |
| Concrete | Sikafloor®-161 HC with sand broadcast* or Sika® Primer PW-F |
| Metal | Sikalastic® Metal Primer or Sika® Primer PW-F |
| Asphalt | Sikalastic® Metal Primer |
*For the porous substrate, need Sika technical team to advice on site
Shore A hardness
| ~79 (7 days / +23 °C) | (JIS K6253) |
Tensile strength
| ~10 N/mm2 (7 days / +23 °C) | (JIS A6021) |
Tear strength
| ~58 N/mm (7 days / +23 °C) | (JIS A6021) |
Chemical resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information.
Artificial ageing
Limited resistance to UV-induced degradation
Dry film thickness
~1,5–2,0 mm depending on the system
Application
Mixing ratio
Part A : Part B = 50 : 50 (by volume)
Product temperature
Important: Make spray equipment fine temperature adjustments to obtain equal output pressures of the 2 parts.
Note: Higher temperatures provide lower viscosity and lower pressure.
| Part A (Isocyanate) | ~55 °C |
| Part B (Polyol mix) | ~66 °C |
Ambient air temperature
+5 °C min. / +35 °C max.
Relative air humidity
85 % max.
Substrate temperature
+5 °C min. / +35 °C max.
Dew point
Beware of condensation.
The substrate and uncured applied membrane must be at least +3 °C above dew point.
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).
Waiting time to overcoating
Important: If the maximum waiting time is exceeded then Sika® Sokan Primer-J must be applied as a bonding bridge.
Before applying Sikalastic® U-Coating or ExcelTop High Reflection on Sikalastic®-853 R AP allow:
| Substrate temperature | Minimum | Maximum* |
| +10 °C | ~90 minutes | ~3 hours |
| +20 °C | ~60 minutes | ~2 hours |
| +30 °C | ~30 minutes | ~2 hours |
| +45 °C | ~20 minutes | ~1 hours |
Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
Drying time
Cup Gel Test: Gel time (+25 °C) starts after ~20 seconds.
Applied product ready for use
| Temperature | Rain Resistant | Foot Traffic |
| +10 °C | ~5 minutes | ~90 minutes |
| +20 °C | ~5 minutes | ~60 minutes |
| +30 °C | ~5 minutes | ~30 minutes |
| +45 °C | ~5 minutes | ~20 minutes |
Foot traffic applies only for inspection or application of next layer
Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
EQUIPMENT
Refer to the Sika Method Statement: Sikalastic®-853 R AP
SUBSTRATE PREPARATION
The supporting structure must be of sufficient structural strength to apply all new and existing layers of the roof build-up. Complete roof system must be designed and secured against wind uplift loadings.
Refer to the Sika Method Statement: Sikalastic®-853 R AP
MIXING
Refer to the Sika Method Statement: Sikalastic®-853 R AP
APPLICATION
Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.
Refer to the Sika Method Statement: Sikalastic®-853 R AP.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Thinner C immediately after use. Hardened material can only be removed mechanically.