Water-repellent silane/siloxane emulsion for masonry and building materials

BRB Siloen® 5022 WR is a water-dilutable, solvent-free silane/siloxane emulsion concentrate with 50 % active content. Diluted with tap water, it makes porous mineral substrates such as brick, concrete, sand-lime brick and mortar water-repellent without blocking the pores. The wall stays breathable. The concentrate is a milky white liquid with a density of 0.95 at 25 °C and a pH of 6 to 8.

Key benefits

• Deep penetration: excellent penetration depth into porous substrates.
• Breathable: high resistance to capillary water while the wall can still breathe.
• Fast water repellency: the beading effect develops within minutes.
• Alkali resistant: suitable for concrete and mortar.
• Invisible: does not change the appearance of the substrate.
• Solvent-free: replaces solvent-based silane/siloxane water repellents.
• Economical: performs well at high dilution.

Typical applications

• ✓ Water-proofing masonry: brick, tiles, limestone, sandstone, concrete and mortar
• ✓ Deep-penetrating primer under emulsion paints, renders and concrete coatings
• ✓ Impregnating building materials such as clay, aerated concrete, sand-lime brick and fibre cement
• ✓ Making hollow, porous stone objects water-repellent from the inside

Application

1. Let new masonry cure for at least 2 weeks. The substrate must be dry and clean.
2. For masonry, dilute 1 part concentrate with 4 to 9 parts tap water (5 to 10 % active content). For ordinary brick we recommend 1 to 7. Very dense concrete may need 1 to 2.
3. For impregnating building materials, dilute 1:20 to 1:50, depending on the material and method (spraying or dipping).
4. Always stir the solution before use.
5. Apply with a low-pressure sprayer, roller or brush. Treat a whole wall in one go, otherwise you will not be able to see where you stopped.
6. Preferably apply 2 coats wet-on-wet: the second coat while the first is not yet completely dry.
7. Allow 0.8 to 1.5 litres of diluted solution per m², depending on how absorbent the stone is.
8. The water-repellent effect develops within minutes. Best results are achieved after a few days.

Points to note

• ✓ Not suitable for gypsum or for dense, low-absorbency natural stone such as marble.
• ✓ Do not apply in rain or on extremely hot substrates. If it starts to rain, stop and cover the treated areas.
• ✓ Ethanol is released during application. Ensure good ventilation.
• ✓ Diluted solutions can cream. Stirring makes the emulsion homogeneous again, without loss of performance. With demineralised water a dilution stays stable for at least 6 months; with tap water a preservative may be needed.
• ✓ Wear gloves and eye protection and avoid release to the environment.

Professional support

Not sure which dilution suits your substrate? Email us at info@siliconesandmore.com and we will be happy to help.