Sikalastic®-770 BC

• CE Marking and Declaration of Performance to European Technical Assessment (ETA) No 24/0043 based on ETAG 005 Part 6 – Liquid-applied roof waterproofing using kits based on polyurethane.

• Test report - Resistance to root penetration according to CEN/TS 14416

Aromatic polyurea

12 months from date of production

The product must be stored in its original, unopened, and undamaged packaging. Keep in dry conditions at temperatures between +5 °C and

+25 °C. Refer to the current Safety Data Sheet for information on safe handling and storage.

~1.35 kg/l (at +20 °C)

Notes:

• Sikalastic®-670 TC / Sikalastic®-701 is not required on non-exposed roofs. However, it is always recommended to apply a top coat, in order to increase system perfomance.
• Consult Sika Technical Services Department for different types of reinforcement and its use.
• For the consumption rates and waiting time / overcoating please refer to the PDS of the appropriate product.

up to +200 °C (short-term)

≤ 85 % r.h.

Beware of condensation.

The substrate and uncured membrane must be at least 3 °C above dew point to reduce the risk of condensation or blooming of the membrane finish.

≤ 4 % pbw moisture content.

The folllowing test methods can be used:

• Sika®-Tramex meter
• CM - measurement
• Oven-dry-method

No rising moisture according to ASTM (Polyethylene-sheet).

Notes:

• For the consumption rates and waiting time / overcoating please refer to the PDS of the appropriate primer.
• Other substrates must be tested for their compatibility. If in doubt, apply a test area first.

~30 min (at +20 °C)

~3 hours (at +25 °C & 55 % r.h.)

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

Sikalastic®-770 BC is applied in 1 or 2 coats.

Approx. 1.5–2.0 kg/m² depending on the system configuration.

Substrate preparation equipment

• Abrasive blast cleaning / planing / scarifying or grinding equipment

• High pressure power washer

Mixing equipment

• Electric single paddle mixer (300-400 rpm)

Application Equipment

• Brush

• Roller

• Notched trowel

• Airless spray

Concrete substrates must be sound and of sufficient compressive strength (≥ 25 N/mm²) with a minimum pull off strength of 1.5 N/mm²

The surface must be of sufficient structural strength, clean, dry and free of dirt, oil, grease and other contaminants.

Depending on the material, the substrate must be primed and mechanically cleaned. Grinding may be necessary to level the surface.

Refer to the Sika General Method Statement: Sikalastic®-770 BC for more preparation details including suitable substrates and necessary pre-treatments.

Prior to mixing of all components, mix Part A separately using an electric single paddle mixer or stirrer (300–400 rpm). When all of part B has been added to part A, mix continuously for 3 minutes until a uniform mix has been achieved.

To ensure thorough mixing, pour materials into another clean container and mix again to achieve a consistent mix. Over mixing must be avoided to minimise air entrainment.

Prior to application, confirm substrate moisture content, relative humidity and dew point.

Priming coat must have properly cured and tack-free. Refer to the PDS of the appropriate primer for their respective Waiting Time / Overcoating period.

Single coating application:

Single coat application is suitable on fairly leveled horizontal surfaces and non-absorbent substrates that are not prone to sagging and "pin holing".

Sikalastic®-770 BC can be applied in a single coat to achieve the recommended consumption using an airless spray or knotched trowel. Brush is typically used for detailing application.

Multiple coating application:

Application in multiple coats prevents sagging due to the material's self-levelling property. It also allows touch up repairs within the initial coat, allowing it to be fully sealed from the second coat.

Where multiple coating layer is required, the recommended consumption can be splitted into two or three coats to built up the required thickness using a knotched trowel or roller. Brush is typically used for detailing application. Allow the indicated waiting / overcoating time between coats.

Reinforcing Sikalastic®-770 BC:

Sikalastic®-770 BC typically requires partial reinforcement over areas of stress or predictable movement such as joints, overlaps, detailings and cracks. Fully reinforcing Sikalastic®-770 BC is an option for more critical applications. Refer to Sika General Method Statement: Sikalastic®-770 BC or contact Sika Technical Services Department for suitable reinforcements.

Clean all tools and application equipment with a suitable thinner (Xylene / MEK / Acetone) immediately after use. Hardened material can only be removed mechanically. Sikalastic®-770 BC is a fast setting material, thus, proper cleaning and maintenance of spray equipment is important.