Description
Sika’s Lanko 751 Lankolatex SBR is a styrene-butadiene rubber latex admixture for cement-based renders, screeds and repair mortars. Mixed in with the mortar, it improves the bond strength, compressive strength, flexibility and water resistance of the finished mix over a plain cement blend, which matters on substrates that flex slightly or take repeated wetting. It can also improve workability, making a stiff repair mortar easier to mix and place on site.
Trade users reach for an SBR latex like this one whenever a screed, render, patch or repair needs to grip an existing substrate more reliably than cement alone, without moving to a full polymer-modified system. It is compatible with both the Lanko and Davco ranges of cement-based technical mortars, tile adhesives and grouts, so it slots into whichever of those systems is already being used on the job.
Technical Specifications
| Product type | Styrene-butadiene rubber (SBR) latex additive |
|---|---|
| Compatible with | Lanko and Davco cement-based mortar, tile adhesive and grout systems |
| Packaging | 5 litre and 20 litre |
| Shelf life | 12 months unopened |
| Storage conditions | Original sealed packaging, dry conditions, 4°C to 35°C |
| Application temperature | 5°C to 40°C |
Where to Use
- As a bonding and flexibility additive in cement-based renders and screeds
- Mixed into repair mortars on substrates needing improved adhesion
- As an additive for Davco cement-based tile adhesives and grouts
- As a bonding coat with neat cement ahead of a mortar system, on very porous or difficult substrates
How to Apply
- Prepare the surface — it must be dry, structurally sound, clean and free of dust, oil, wax, mastic, paint and other contaminants. Remove release agents from tilt-up slabs, and scabble painted surfaces to expose at least 80% of the original substrate.
- Confirm cure age — new concrete needs a minimum six-week cure, and newly rendered surfaces their own curing period, before applying a Lankolatex 751-modified coat.
- Prime very porous surfaces — where needed, apply Lankolatex 751 as a neat cement bonding coat before the main mortar system.
- Mix into the mortar — add Lankolatex 751 to the cement blend following the ratio for the specific render, screed, repair mortar, tile adhesive or grout being used.
- Apply and clean up — place and finish using standard trade technique, and clean tools and equipment with water while the product is still wet.
Important Notes
- Do not use below 5°C or above 40°C.
- Not recommended for bonding plastic or rubber.
- Store in the original sealed container, out of direct sun, between 4°C and 35°C.
- For full mixing ratios with a specific Lanko or Davco product, refer to that product’s own datasheet.
