Everbuild 503 SBR Bond

Description

Everbuild 503 SBR Bond is a latex based, water resistant bonding agent, primer and admixture. It is supplied as a white liquid. Polymer Emulsions of this type have been used extensively over the last 20 years by the building industry as an admixture for cement and concrete applications, including repair and renovation, surfacing of floors and bonding generally. Everbuild 503 SBR Bond contains anti-foam to control the density of cementitious mixes.

Benefits of using Everbuild 503 SBR Bond:

• Greatly improved adhesion to a wide range of substrates including dense concrete, steel, tiles etc.
• Mixes may be applied in much thinner sections
• Excellent resistance to water and water vapour
• A high level of resistance to salt permeation
• Much improved toughness and flexibility
• Reduced surface dusting of concrete
• Greatly improved resistance to many chemicals- ideal for use in dairy parlours etc.
• Reduced water: cement ratio for equivalent workability
• Improved frost resistance
• This product is also freeze/thaw stable.

Areas For Use:

• As an admixture for mortar/screeds/renders.
• As a bonding agent for screeds/renders.
• As a primer/sealer in tiling applications.
• As a flexibliser for cementicious based tile adhesive when tiling on wooden/asphalt floors.
• In addition, SBR Bond has the advantage over PVA bonding aids in that it is not adversely affected in wet conditions and is therefore recommended for exterior use.

Substrate Preparation:
All surfaces must be clean, dry and free from dust, grease and other contaminants. The background must be capable of withstanding all stresses which will be put onto it and contain the appropriate joints. If it is to receive a topping the background should have a compressive strength greater than 30N/mm² and/or a tensile strength greater than 1N/mm².
Floors should be mechanically prepared, eg scabbled or shot blasted, to give an aggregate exposed surface. Dust should be removed by vacuum, not compressed air. All contaminants such as oil, grease, or any surface laitence must be removed to ensure adequate development of bond when the topping is applied. A water drop test is the simplest method to determine whether water repellent contamination is present.

Mixing:
Mixing procedures for topping and screeds containing Everbuild 503 SBR Bond are similar to those used to conventional compositions, with gauging water partly replaced by Everbuild 503 SBR Bond. However, mixing time should be minimised to limit air entrainment. Mixing should be carried out in a forced action mixer. The usual procedure is to pre-mix sand and cement in the mixer, pour in the Everbuild 503 SBR Bond, mix for 1 – 3 mins, then slowly add water to the required consistency. NB. Over addition of water causes rapid thinning of latex modified mortars owing to the plasticising effect of the latex. The mix design depends upon thickness and intended use. Please see the product datasheet linked below for mix ratios for a 12mm topping or screed.

Priming:
Application of a primer coat is necessary to obtain maximum adhesion of the topping or screed.

Everbuild 503 SBR Bond – Flooring Applications:
This concerns the use of Everbuild 503 SBR Bond in screeds and toppings over background concrete. Adding Everbuild 503 SBR Bond to a floor screed or topping gives the following advantages:

• A low water:cement ratio allows a minimum of delay when overcoating is required.
• Reduced permeability to liquids.
• Improved chemical, abrasion and impact resistance.
• Resistance to dusting.
• Thinner screeds, achieving reduction in weight and savings in materials.
• Excellent slip resistance.
• Goods underlay for epoxy surfacing.
• Everbuild 503 SBR Bond has a long and successful track record of use in the construction industry.

Selection of materials:
To obtain maximum performance from mixes modified with Everbuild 503 SBR Bond it is important that attention is paid to the quality of the other materials used:

• Sand should be well washed and sharp. The grade of sand will depend upon the mix design.
• Cement Portland, High Alumina and sulphate resisting cements are compatible with SBR Bond. Portland cement should be fresh but cool. Cement containing air set lumps should not be used.
• Coarse aggregate e.g. Granite chippings. These should be dust free.
•  Air entraining agents These should not be used.

Pot Life:
The mix has a pot life of approximately 30 minutes and batch size should be calculated accordingly.

Application:
1. Apply topping or screed onto wet or tacky primer.
2. Compact and level with screed bar. Finish with steel float. It is essential that the topping or screed is finished as the work proceeds.
3. The topping or screed would be cured for 1 – 2 days using conventional techniques. Curing should be started quickly after application.

Limitations:
In common with other SBR products, Everbuild 503 SBR Bond is not suitable for coloured exterior decorative renders which will not be subsequently overpainted. Its poor UV resistance may also cause discolouration.

Surface Preparation:
All surfaces must be clean, dry and free from dust, grease and other contaminants.

Storage:
This product is best stored at moderate temperatures to avoid the possibility of permanent damage occurring due to prolonged heat or excessive cold. However if frozen, the latex should be thawed slowly. The product should preferably be stirred before use. It contains sufficient bactericide to preserve the latex under normal storage conditions.

Product Datasheet

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