Sika Latex® Water Resistant Bonding Agent and Mortar Additive 20L

Description 
• Formally known as SikaLatex®.
• SikaLatex® MY is a modified styrene butadiene emulsion to be mixed with cement (neat) or cement / sand mortar for improved adhesion and water resistance properties.

Characteristics / Advantages
▪ Increases adhesion, flexural and tensile strength.
▪ Improves abrasion resistance (less dusting).
▪ Reduces water permeability.
▪ Increases chemical resistance.
▪ Non-toxic, non-corrosive and non-flammable.
▪ Easy to use.
▪ Does not re-emulsify even in high alkaline conditions.

Specification
Product Information
▪ Packaging: 20 L pail
▪ Appearance / Colour: Milky white liquid
▪ Shelf Life: 12 months from the date of production
▪ Storage Conditions: Store properly in original, unopened and undamaged sealed packaging in dry conditions. Protect from direct sunlight.
 

Technical Information
▪ Mortar Mix Design: (all mixing ratios given are by volume)
Bonding Coat
▪ SikaLatex® MY:water: 1:1
▪ Cement:sand: 1:1
▪ Sand grain size: See "Further Information - Sand"
▪ W/C ratio: Mix to suit requirement / application. Generally, use as little gauging water (SikaLatex® MY solution) as possible.
▪ Consumption: See ‘Consumption’ (approx. 0.23–0.3 L of SikaLatex® MY per m² per 1 mm thickness based on W/C ratio of 0.5–0.8).
Repair and Patching Mortar, Masonry Joints, etc
▪ SikaLatex® MY : water:
   - 1:1 for mortar < 10 mm thickness
   - 1:2 for mortar > 10 mm thickness
▪ Cement : sand: 1:1 to 1:3
▪ Sand grain size: See "Further Information - Sand"
▪ W/C ratio: Mix to suit requirement / application. Generally, use as little gauging water (SikaLatex® MY solution) as possible.
▪ Consumption: See ‘Consumption’ (approx. 0.7–2.3 L of SikaLatex® MY per m² per 10 mm thickness based on W/C ratio of 0.5–0.8).
Floor Screeds, Intermediate Coats and Wear Resistant Screeds
▪ SikaLatex® MY : water:
   - 1:1 to 1:2 for hard wearing floors
   - 1:2 to 1:4 for normal use
▪ Cement : sand: 1:2 to 1:3
▪ Sand grain size: See "Further Information - Sand"
▪ W/C ratio: Mix to suit requirement / application. Generally, use as little gauging water (SikaLatex® MY solution) as possible.
▪ Consumption: See ‘Consumption’ (approx. 0.4–1.9 L of SikaLatex® MY per m² per 10 mm thickness based on W/C ratio of 0.5–0.8).
Renderings
Normal Rendering with Hydraulic Lime Mortar
▪ SikaLatex® MY : water: 1:2 to 1:4
▪ Binder with sand: 1:2.5 to 1:4
▪ Sand grain size: 0.3–0.8 mm
▪ W/C ratio: Mix to suit requirement / application. Generally, use as little gauging water (SikaLatex® MY solution) as possible.
▪ Consumption: See ‘Consumption’ (approx. 0.3–1.1 L of SikaLatex® MY per m² per 10 mm thickness based on W/C ratio of 0.5–0.8).
Cement / Sand Rendering
▪ SikaLatex® MY : water: 1:1 to 1:2
▪ Cement : sand: 1:3 to 1:4
▪ Sand grain size: 0.3–0.8 mm
▪ W/C ratio: Mix to suit requirement / application. Generally, use as little gauging water (SikaLatex® MY solution) as possible.
▪ Consumption: See ‘Consumption’ (approx. 0.7–1.9 L of SikaLatex® MY per m² per 10 mm thickness based on W/C ratio of 0.5–0.8).
Adhesive Mortar (e.g. as a tile adhesive)
▪ SikaLatex® MY : water: 1:2
▪ Cement : sand: 1:2
▪ Sand grain size: 0–2 mm with higher proportion of fine sand under 0.2 mm
▪ W/C ratio: Mix to suit requirement / application. Generally, use as little gauging water (SikaLatex® MY solution) as possible.
▪ Consumption: See ‘Consumption’ (approx. 0.7–1.0 L of SikaLatex® MY per m² per 10 mm thickness based on W/C ratio of 0.5–0.8).
 

Application Information
Consumption: Approx. SikaLatex® MY requirement in litre per m² per 10 mm thickness.
Mixing ratio by volume.
SikaLatex® MY : Water = 2:1
Cement : Sand
1:1
1:1.5
1:2
1:2.5
1:3
1:4
W/C Ratio = 0.5
3.0
2.2
1.9
1.6
1.4
1.2
W/C Ratio = 0.8
4.0
3.0
2.5
2.2
2.0
1.6
SikaLatex® MY : Water = 1:1
Cement : Sand
1:1
1:1.5
1:2
1:2.5
1:3
1:4
W/C Ratio = 0.5
2.3
1.6
1.4
1.2
1.1
0.9
W/C Ratio = 0.8
3.0
2.3
1.9
1.7
1.5
1.2
SikaLatex® MY : Water = 1:1.5
Cement : Sand
1:1
1:1.5
1:2
1:2.5
1:3
1:4
W/C Ratio = 0.5
1.8
1.3
1.1
1.0
0.8
0.7
W/C Ratio = 0.8
2.4
1.8
1.5
1.3
1.2
1.0
SikaLatex® MY : Water = 1:2
Cement : Sand
1:1
1:1.5
1:2
1:2.5
1:3
1:4
W/C Ratio = 0.5
1.5
1.1
0.9
0.8
0.7
0.6
W/C Ratio = 0.8
2.1
1.5
1.3
1.1
1.0
0.8
SikaLatex® MY : Water = 1:2.5
Cement : Sand
1:1
1:1.5
1:2
1:2.5
1:3
1:4
W/C Ratio = 0.5
1.3
0.9
0.8
0.7
0.6
0.5
W/C Ratio = 0.8
1.7
1.3
1.1
1.0
0.9
0.7
SikaLatex® MY : Water = 1:3
Cement : Sand
1:1
1:1.5
1:2
1:2.5
1:3
1:4
W/C Ratio = 0.5
1.1
0.8
0.7
0.6
0.5
0.4
W/C Ratio = 0.8
1.5
1.1
1.0
0.8
0.8
0.6
SikaLatex® MY : Water = 1:4
Cement : Sand
1:1
1:1.5
1:2
1:2.5
1:3
1:4
W/C Ratio = 0.5
0.9
0.7
0.6
0.5
0.4
0.3
W/C Ratio = 0.8
1.2
0.9
0.8
0.7
0.6
0.5
• Ambient Air Temperature: Minimum +5 °C
• Substrate Temperature: Minimum +5 °C

Uses
▪ For higher strength floor screeds with less ‘dusting’, improved flexibility and resistance to cracking.
▪ For wear resistant floor toppings in water treatment works, sewage systems, etc. together with Sika®-1 System.
▪ As an additive to repair mortars for patching and filling.
▪ As a bonding agent for rendering, tile fixing and masonry jointing mortars, etc.
▪ As a bonding grout between old and new concrete, as well as in construction joints.

Application Method / Tools
Bonding Coat
▪ For rendering on to difficult substrates, waterproof renderings with Sika®-1 System, laying of floor screeds, concrete repair, patching & filling, bonding between new and old concrete, etc., a bonding coat of mortar or slurry with SikaLatex® MY solution is recommended.
As a Bonding Coat for Rendering
▪ Mix up a stiff mortar and place on a layer of 4–5 mm thickness. Ensure the layer is tack free before followon application of rendering coats of conventional render or ready-to-use mortar. For waterproof rendering with Sika®-1 System, consult Sika®-1 product data sheet.
For Bonding New to Old Concrete
▪ Prepare a mortar of pasty consistency. Apply the mortar on to the wetted surface in 20–30 mm layer thickness and pour new concrete on to it immediately. ▪ Vibrate the concrete carefully to achieve satisfactory inter-mixing of the SikaLatex® MY mortar and the concrete.
As a Bonding Coat for Floor Screeds, Patching & Filling
Mortar and Other General Uses
▪ Mix up a good brushable slurry and apply on to the substrate in 1–3 mm thickness. Work well into the substrate with a stiff brush. Follow-on screed, patching or filing mortar to be applied immediately, wet-on-wet.
▪ Neat cement may be used instead of a dry mix of cement and sand.
Repair and Patching Mortar, Masonry Joints, etc
Repair and Patching Mortar
▪ Apply the stiff plastic mortar on the well saturated substrate. For areas subject to heavy use or application on to very smooth substrates apply a bonding coat prior to application of mortar. Also see ‘Further Information - High Cement Mortar / Thick Applications’.
Masonry Joints
▪ Mix mortar into a paste-like consistency and place firmly into the previously wetted joints with a spatula or pointing trowel and finish off with a pointing trowel.
▪ With a richer SikaLatex® MY solution, e.g. SikaLatex® MY:water = 2:1, a higher chemical resistance is achieved especially against urine, ammonia and diluted alkaline solutions.
Floor Screeds, Intermediate Coats and Wear Resistant Screeds
▪ After applying the bonding coat on to the substrate, place the mortar wet-on-wet in layers of 15–30 mm thickness. Compact well and rub down. Pay attention to the arrangement of expansion and construction joints. Observe normal curing practice.
▪ When no curing compound is available at site, curing may be done by spraying the surface with SikaLatex® MY solution (SikaLatex® MY : water = 1:1) as soon as the mortar has started to harden. After 24 hours, keep the surface wet by spraying water on it.
▪ Also see ‘Further Information – High Cement Mortar / Thick Applications’.
Renderings
▪ SikaLatex® MY is added to the rendering mortar where properties such as improved adhesion, better flexibility, reduced shrinkage and water permeability are required.
▪ Apply the bonding coat according to 'Mortar Mix Design'. The rendering is then applied on to the tackfree bond coat in accordance with good rendering practice.
Adhesive Mortar (e.g. as a tile adhesive)
▪ Mix up a mortar for application by trowel and fix tiles according to good application practice (thin layer method), onto a smooth concrete or rendering / screed finish. For waterproof joint-grouting, a mixture of pure cement and SikaLatex® MY shall be used.

Important Considerations
▪ SikaLatex® MY mortar should be thoroughly mixed (but not longer than 1–2 minutes otherwise too much air may be entrained).
▪ Do not use neat SikaLatex® MY as a bonding coat. A delay in subsequent overcoating may result in a film forming on the substrate causing separation of subsequent layers. Use SikaLatex® MY as an additive to make up cementitious slurry or a cement / sand mortar.
▪ Over dilution of SikaLatex® MY solution, for e.g. more than 1:4 (SikaLatex® MY : water) is not recommended as this will result in very little performance improvement.
▪ SikaLatex® MY mortar should not be applied at temperatures below +5 °C.
▪ SikaLatex® MY mortar is not resistant to constant contact with petrol, organic solvents and acids.
▪ When working with SikaLatex® MY mortar, observe the following working rules as if working with ordinary
cement mortars:
   - Clean and prewet surface (saturated surface dry).
   - Use clean sand with suitable sieve grading curve (sieve distribution).
   - Use as little gauging water (SikaLatex® MY solution) as possible.
   - For multi-layered application, always work wet-onwet.
   - Protect against rapid drying due to wind and extreme temperature.
▪ Proper curing of cement based product is essential.
▪ Where overcoating of the screed / render / mortar is required apply Antisol®-A curing compound. In other cases, apply Antisol®-E, Antisol®-90 or other curing practices such as covering with polythene sheets or damp hessian.

Product Data Sheet (PDS). 

Disclaimer
All product images shown are for illustration purposes only. Actual products may varies in term of size, type, brand, version, colour, and other relevant characteristics.