Sikalastic®-625 N
High performance polyurethane liquid applied waterproofing membrane
Sikalastic®-625 N is a 1-part polyurethane, reinforced, cold-applied liquid membrane. It provides a flexible, seamless waterproofing solution using Sika's unique i-Cure technology.
- 1-part ready to use
- Low maintenance
- Seamless
- Easy and quick application by brush, roller or spray
- Suitable for trafficable areas
- Vapour permeable
- Good UV resistance and colour stability
- Retains flexibility at low temperatures
- Cold applied - requires no heat or flame
- Moisture triggered technology develops early rain resistance
- Good elastic properties
- Low temperature application > +2 °C
Usage
Designed for the following waterproofing applications:- Roof waterproofing for new construction and refurbishment projects
- Locally reinforced waterproofing system for profiled metal roofs
- Fully reinforced waterproofing of flat and pitched roof structures, communal walkways, podium decks and roof terraces exposed to pedestrian traffic
- Waterproofing structures with numerous details such as penetrations, drains, roof lights and complex geometry
- Waterproofing existing substrates of concrete, bituminous felt and coatings, brick, stone, asbestos cement, metal, wood, unglazed ceramic tiles
- For exterior use only
Advantages
- 1-part ready to use
- Low maintenance
- Seamless
- Easy and quick application by brush, roller or spray
- Suitable for trafficable areas
- Vapour permeable
- Good UV resistance and colour stability
- Retains flexibility at low temperatures
- Cold applied - requires no heat or flame
- Moisture triggered technology develops early rain resistance
- Good elastic properties
- Low temperature application > +2 °C
Packaging
15 L container
Refer to current price list for packaging variations.
Colour
Note: Applied colours selected from colour charts will be approximate.
Note: For colour matching: Apply colour sample and confirm selected colour under real lighting conditions.
Light Grey (~RAL 7035), White (~RAL 9016), Slate Grey (~RAL 7015)
Product Details
APPROVALS / STANDARDS
- CE Marking and Decalaration of Performance to European Technical Assessment ETA-20/0073, based on ETAG 005 Part 1 and Part 6
- Fire Testing according to ENV 1187: Test Report No. 19823F, 19823K, 19823B, 19750A, 19750D, 19750G
- Fire Testing EN 13501-1, Sikalastic®-625 N, Warrington fire, Report No.WF 418126
- BBA Certificate 16/5294 (11.5.20)
Chemical Base
Elastomeric aliphatic polyurethane
Shelf Life
12 months from date of production
Storage Conditions
The 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
| ~1.26 kg/l | (EN ISO 2811-1) |
Solid content by weight
| ~77 % (+23 °C / 50 % r.h.) | (EN ISO 3251) |
Solid content by volume
| ~71 % (+23 °C / 50 % r.h.) | (EN ISO 3251) |
System Structure
Note: For detailed reinforcement information refer to the Sika Method Statement: Sikalastic®-625 N
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 etc.
Fully reinforced roof waterproofing ETA-20/0073 (ETAG 005)
The build-up in the table corresponds to a reinforced waterproofing kit for flat and pitched roofs, communal walkways, podium decks and roof terraces.
| Layer | Product | Consumption |
| 1. Primer | Depending on the substrate | Refer to the primer Product Data Sheet |
| 2. Base Coat | Sikalastic®-625 N | ~1.0 l/m2 |
| 3. Reinforcement | Sika® Reemat Preemium | - |
| 4. Top Coat | Sikalastic®-625 N | ~1.0 l/m2 |
Locally reinforced roof waterproofing ETA-20/0073 (ETAG 005)
Important: If required, use reinforcement in localised areas for all joints, areas subject to differential movement, guttering / drainage channels and repairs to membrane.
The build-up in the table corresponds to an unreinforced waterproofing kit used on profiled metal roofs.
| Layer | Product | Consumption |
| 1. Primer | Depending on the substrate | Refer to PDS of the primer |
| 2. Base Coat | Sikalastic®-625 N | ~0.5 l/m2 |
| 3. Localised reinforcement | Sika® Reemat Preemium | - |
| 4. Top Coat | Sikalastic®-625 N | ~0.5 l/m2 |
Tensile Strength
| Reinforced | ~13 N/mm2 |
| Unreinforced | ~6 N/mm2 |
Tear Strength
| ~26 N/mm | (ISO 527-1/3) |
Solar Reflectance
Initial: 0.87
Thermal Emittance
Initial: 0.88
Solar Reflectance Index
Initial: 110
Service Temperature
-20 °C min. / +80 °C max.
Thermal Resistance
-20 °C to +80 °C
Chemical Resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information.
External Fire Performance
| Broof (t1); Broof (t4) | (ENV-1187) |
Reaction to Fire
| Euroclass E | (EN13501-1) |
Dry film thickness
| ETA-20/0073 waterproofing kit for all flat roof types | ~1.5 mm |
| ETA-20/0073 waterproofing kit for all metal roof types | ~0.7 mm |
Application
Ambient Air Temperature
+2 °C min. / +30 °C max.
Relative Air Humidity
20 % min. / 85 % max.
Dew Point
Beware of condensation.
The substrate and uncured applied product must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the surface of the applied product. Metal surfaces will be more prone to temperature fluctuations occurring and wind chill effects.
Substrate Temperature
+2 °C min. / +30 °C max.
Substrate Moisture Content
≤ 4% parts by weight
The following test methods can be used to determine the substrate moisture content:
- Sika®-Tramex meter
- No rising moisture must be present according to ASTM (Polyethylene-sheet).
Pot Life
Note: The material in opened containers must be applied before a surface skin occurs.
Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
~1–2 hours
Applied Product Ready for Use
Important: The impact of heavy rain or rain showers can physically mark or damage the membrane in its liquid state.
Note: Application at higher than recommended film thicknesses may result in a prolonged “soft” feel to the coating. This will eventually cure and harden.
Note: Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.
| Ambient conditions | Rain resistant | Touch dry | Full cure |
| +2°C / 50 % r.h. | ~12 hours | ~20 hours | >24 hours |
| +10°C / 50 % r.h. | ~9 hours | ~15 hours | ~24 hours |
| +20°C / 50 % r.h. | ~6 hours | ~10 hours | ~18 hours |
| +30°C / 50 % r.h. | ~4 hours | ~6 hours | ~14 hours |
EQUIPMENT
Select the most appropriate equipment required for the project:
Substrate preparation equipment
- Abrasive blast cleaning / planing / scarifying or grinding equipment.
- Manual or mechanical wire brushes
- High pressure power washer
For other types of preparation equipment, contact Sika Technical Services
Mixing Equipment
- Electric single paddle mixer (300–400 rpm) with spiral paddle
For other types of preparation equipment, contact Sika Technical Services
Application Equipment
- Brush
- Roller
- Airless spray
For more detailed information refer to the Sika Method Statement: Sikalastic®-625 N
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®-625 N
- Suitable substrates: Cementitious, concrete, bituminous felt and coatings, brick, stone, asbestos cement, metal, wood, unglazed ceramic tiles
General
All contamination such as dust, loose and friable material that could affect final finish or reduce adhesion, must be completely removed from all surfaces before application of the product or subsequent products, preferably by industrial vacuuming equipment.
MIXING
- Sikalastic®-625 N is supplied ready for use.
- Before application, mix for at least 2 minutes or until the liquid and all the coloured pigment have achieved a uniform colour.
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.
Reference must be made to the Sika Method Statement: Sikalastic®-625 N
CLEANING OF TOOLS
Clean all tools and application equipment with Thinner C or xylene immediately after use. Hardened material can only be removed mechanically or with a proprietary paint stripper.