MC-Proof PU 920

PRODUCT PROPERTIES:

• One component, Hybrid Polyurethane base.
• Low viscosity, easy to apply.
• Low solvent content.
• Very good bonding on various surfaces.
• High solid content creates a durable and seamless waterproof membrane.
• Excellent flexibility and crack-bridging performance (from 3 to 5mm).
• Resistant to elevated temperatures, frost and de-icing salts.
• Good chemical resistance.
• Optimized workability for application by roller, squeegee, brush and airless spraying on horizontal and inclined surfaces.

AREAS OF APPLICATION:

• Waterproofing for roofs, planting areas, balconies, loggias, drying yards, sewage tanks, etc.
• Waterproofing for bridge deck, basement, foundation,…

PRODUCT CHARACTERISTICS:

APPLICATION NOTES:

• Substrate preparation:

– MC-Proof PU 920 can be applied on all mineral substrates, metals, plastics and even wood.

– All substrates to be coated must be sound, clean and free from all loose particles, dust, oil and any other contaminants (e.g. release agent, cement residue).

– Surface tensile strength must be > 1.5N/mm². The moisture content of the substrate must not exceed 10%.

– Holes and indentations > 5mm deep must be filled with a suitable specialized repair mortar (e.g. Nafufill KM 103).

– At the junction of the floor and the wall, it must be plastered to create a curvature to prevent cracking of the waterproofing membrane.

– Before applying MC-Proof PU 920, joints and cracks must be prepared. Cracks with water leakage can be repaired with specialized products of MC-BIFI (eg MC-Injekt 2188, MC-Injekt 2300,…).

• Primer: Primer is basically not required, however, for maximum adhesion efficiency or requirements with higher than normal adhesion, it is recommended to use Primer with MC-Proof PU 920 mix with 10% thinner.
• Application:

– MC-Proof PU 920 is a ready-to-use liquid PU based, and it needs to be stirred to homogenize before use.

– A slow-speed mechanical stirrer should be used to avoid the entrainment of air into the mixture during stirring.

– Apply MC-Proof PU 920 by roller, brush or spray directly onto the prepared surface.

• The consumption is 1.5 kg/m² corresponding to the waterproof layer thickness of 1.0 mm. To achieve the recommended 2.0 mm dried layer thickness, 2 coats should be applied and the waiting time between 2 applications should be at least 6 hours. This waiting time depends on the temperature and other climatic conditions at the site.

– After construction, the protective mortar layer should be rolled onto the waterproof layer, to ensure the long-term durability of the waterproof layer.

• Curing: After application, MC-Proof PU 920 needs to be protected until the waterproofing layer meets the final specifications (e.g. traffic, rain, humidity >90% RH, etc.)
• Cleaning: Cleaning tools and equipment with MC-Thinner after use. Hard materials can only be removed by mechanical agents.
• Safety information: MC-Proof PU 920 contains no harmful substances that require labeling. Very safe under normal working conditions such as wearing gloves and goggles, etc. MC-Proof PU 920 causes mild skin sensitization upon direct contact.

TECHNICAL DATAS:

*All technical data are based on laboratory tests at 23°C ±2 and 60% RH and may vary in practical application. To determine the individual technical suitability, preliminary suitability tests should be carried out under the application conditions.