Sikafloor®-425

• 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

Elastomeric aliphatic polyurethane

12 months from date of production

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.

84,6 %

79,3 %

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

Refer to the relevant System Data Sheet

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

< 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.

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.

Note: Times are given at 50 % r.h.. Times in brackets are with the use of Sika® PU Accelerator.

Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.

Note: Times are given at 50 % r.h.. Times in brackets are with the use of Sika® PU Accelerator.

Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity. Times are also dependant on layer thickness.

~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.

Mixing equipment

• Electric single paddle mixer (300 to 400 rpm)

Application equipment

• Brush
• Short pile roller
• Squeegee

Avoid over-mixing to minimise air entrainment.

1. Before application, mix for at least 2 minutes

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

1. Pour the Product onto the surface.
2. 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.

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