Product Data Sheet Show all documents

Sikalastic®-853 R AP

Hybrid polyurea hot spray applied membrane for roof waterproofing

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 chemical resistance
  • Good adhesion to many substrates with the appropriate primers
  • Thickness: ~1.5–2.0 mm
Product Data Sheet Show all documents

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, tiles)
  • 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 chemical resistance
  • 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

Colour

Part A

~Clear / brownish

Part B

~Amber

Part C

Grey No.12 (~RAL 7011)

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • Sikalastic®-853 R AP is in conformance with JIS A 6021
Product Information

Chemical base

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 C1.25 kg/L

Mixed resin

1.01 kg/L

Values at +23 °C

Solid content by weight

> 99 %
System information

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 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 (concrete substrates)~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

Sika® Concrete Primer or Sikalastic®-10 Primer EP or Sika® Primer PW-F

Metal

Sikalastic® Metal Primer or Sikalastic®-10 Primer EP or Sika® Primer PW-F

Asphalt

Sikalastic® Metal Primer or Sikalastic®-10 Primer EP or Sika® Lance-Lock Sheet
Technical Information

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

Application Information

Mixing ratio

Part A : Part B + Part C = 1 : 1 (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.

Dew point

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

Substrate temperature

+5 °C min. / +35 °C max.

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 / 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 temperatureMinimumMaximum*
+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.
Application steps

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 TOOLS

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

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