Sikafloor®-425
1-part elastic smooth polyurethane floor coating
Sikafloor®-425 is a 1-part coloured, UV resistant polyurethane resin floor coating. It provides a seamless, waterproof and slip resistant smooth matt finish. It is part of the Sikafloor® Monoflex flooring range for decorative or engineered applications
- iCure® based technology
- Moisture-activated curing
- Good crack-bridging ability
- Fast curing
- Abrasion resistant
- Good adhesion to substrate
- Slip resistant
- Waterproof
- Water vapour permeable
- Resistant to weathering
- High yellowing resistance
Usage
The Product can be used as a:- Waterproof coating on concrete and underneath tiles
- The Product may only be used by experienced professionals.
Advantages
- iCure® based technology
- Moisture-activated curing
- Good crack-bridging ability
- Fast curing
- Abrasion resistant
- Good adhesion to substrate
- Slip resistant
- Waterproof
- Water vapour permeable
- Resistant to weathering
- High yellowing resistance
Packaging
6.5 kg (5 L) container
19.5 kg (15.1 L) container
Refer to current price list for packaging variations.
Colour
Final floor finish colour | RAL 7015 (slate grey), RAL 85 00 (light grey), RAL 9016 (traffic white) |
Applied colours selected from colour charts will be approximate.
For colour matching: Apply colour sample and confirm selected colour under real lighting conditions.
Product Details
APPROVALS / STANDARDS
- CE Marking and Declaration of Performance to European Technical Assessment ETA 18/0485, based on ETAG 005 Part 1 and Part 6 — Liquid applied roof waterproofing kits. Part 1: General. Part 6: Specific stipulations for Kits based on Polyurethane
- CE Marking and Declaration of Performance to EN 14891:2012/AC:2012 — Liquid-applied water impermeable products for use beneath ceramic tiling bonded with adhesives
- Fire testing DD CEN/TS 1187, Sikafloor®-425, Exova,Test Report No. 378184
- Reaction to fire classification EN 13501-1, Exova Warringtonfire, Report No. WF 379356
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 sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.
Refer to current Safety Data Sheet for information on safe handling and storage.
Density
Mixed Product | ~1.29 kg/l |
Solid content by mass
84,6 %
Solid content by volume
79,3 %
Abrasion Resistance
AR0.5 (special) - Accelerated Resistance | (BS 8204-2) |
Tensile Strength
Unreinforced | ~7.5 MPa |
Reinforced | ~17 MPa |
Chemical Resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information.
Note: Wine, coffee, certain leaves, flower petals and similar organic materials may cause surface discolouration. This will have no effect on the product performance and durability. Use a suitable top coat, such as Sikafloor®-418, for improved cleanability and resistance to contamination
Application
Layer Thickness
Refer to the relevant System Data Sheet
Product Temperature
Minimum | +2 °C |
Maximum | +30 °C |
Ambient Air Temperature
Minimum | +2 °C |
Maximum | +30 °C |
Relative Air Humidity
Maximum | 80 % |
Minimum | 35 % |
Dew Point
Beware of condensation. The substrate and uncured applied floor material must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the surface of the applied product. Low temperatures and high humidity conditions increase the probability of blooming
Substrate Temperature
Minimum | +2 °C |
Maximum | +30 °C |
Substrate Moisture Content
< 4 % parts by weight (Sika® Tramex moisture meter)
No rising moisture (ASTM D4263, polyethylene sheet)
The substrate must be visibly dry with no standing water.
Pot Life
As soon as the container is opened, surface film formation will happen within 1–2 hours. High temperatures and high air humidity will accelerate curing significantly.
Waiting Time / Overcoating
Note: Times are given at 50 % r.h.. Times in brackets are with the use of Sika® PU Accelerator.
Substrate temperature | Minimum | Maximum |
+10 °C | ~24 hours (6 hours) | ~14 days (14 days) |
+20 °C | ~16 hours (4 hours) | ~14 days (7 days) |
+30 °C | ~12 hours (2 hours) | ~7 days (7 days) |
Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.
Applied Product Ready for Use
Note: Times are given at 50 % r.h.. Times in brackets are with the use of Sika® PU Accelerator.
Temperature | Rain resistant | Foot traffic | Full cure |
+10 °C | ~15 hours (2 hours) | ~24–48 hours (4 hours) | ~7–14 days (36 hours) |
+20 °C | ~5 hours (1 hour) | ~24 hours (3 hours) | ~5–9 days (24 hours) |
+30 °C | ~3 hours (30 min) | ~18 hours (2 hours) | ~3–5 days (16 hours) |
Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity. Times are also dependant on layer thickness.
Consumption
~0.9–1.4 kg/m² per layer depending on the application
Note: These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment.
EQUIPMENT
Mixing equipment
- Electric single paddle mixer (300 to 400 rpm)
Application equipment
- Brush
- Short pile roller
- Squeegee
MIXING
Avoid over-mixing to minimise air entrainment.
- Before application, mix for at least 2 minutes
APPLICATION
IMPORTANT
Protect from moisture
After application, protect the Product from damp, condensation and direct water contact for at least 24 hours.
IMPORTANT
Temporary heating
If temporary heating is required, do not use gas, oil, paraffin or other fossil fuel heaters. These produce large quantities of both carbon dioxide and water vapour, which may adversely affect the finish. For heating, use only electric powered warm air blower systems.
IMPORTANT
Application during falling temperatures
Always apply during falling temperatures. If applied during rising temperatures, pin holes may occur from rising air.
IMPORTANT
Film formation
Start the application procedure immediately once the container has been opened. When exposed to air, film formation will happen within 1–2 hours. High temperatures and high air humidity will reduce pot life significantly.
IMPORTANT
Ensuring consistent colour matching
For consistent colour matching, make sure the Product in each area is applied from the same control batch numbers.
Smooth coating
- Pour the Product onto the surface.
- Apply the Product in two directions at right angles with a short-pile roller, brush, or squeegee.
Note: A seamless finish can be achieved if a "wet" edge is maintained during application.
Note: After thorough cleaning, the product can be overcoated with itself.
CLEANING OF TOOLS
Clean all tools and application equipment with Sika® Thinner C immediately after use. Hardened material can only be removed mechanically