Polymeric bonding agent, waterproof mix enhancer & primer
Vetobond PB434 is a modified styrene-butadiene rubber emulsion that is supplied as a ready-to-use white liquid. It is designed to improve the quality of site-batched cementitious mortars and slurries. When used as a primer, it works to seal the substrate and enhance the bond to mortars and plasters. Being resistant to hydrolysis, it is ideal for internal and external applications in conjunction with cement.
Vetobond PB434 is supplied in 20 & 200 Liters.
Coverage: As per required.
The original sealed container of Vetobond PB434 has a shelf life of 12 months, provided it is stored clear of ground in a dry, shaded place below 35ºC.
For application to all surfaces, Vetobond PB434 mortars, toppings, and renders must be well compacted onto the primed substrate by trowel. It is frequently beneficial to work a thin layer of the mortar into the slurry primer and then build it onto this layer. The mortar should completely encapsulate exposed steel reinforcement.
Vetobond PB434 mortars can be applied at a minimum thickness of 6 mm and up to 40 mm thickness, dependent on the location and configuration of the repair zone. The thickness achievable in overhead locations without the use of formwork is largely dependent on the profile of the substrate.
Refer to the recommended thicknesses shown in the ‘Mix design’ section above. If the recommended thickness is exceeded and sagging occurs, the affected section must be completely removed and reapplied following the procedure described above. The use of formwork may facilitate achieving the required build. If formwork is used, it should have properly sealed faces to ensure that no water is absorbed from the repair material.
Where thicker sections up to a total thickness of 40 mm are to be built up by hand or trowel application, the surface of the intermediate layers should be scratch-keyed and cured with Vetobond AB432. Application of the slurry primer and a further application of Vetobond PB434 mortar may proceed as soon as this layer has been set.
Refer to Vetobond PB434 for further mixing and application details.
Finish Vetobond PB434 mortars with steel, plastic, wood floats, or a damp sponge technique to achieve the desired surface texture. The completed surface should not be overworked.
Low temperature working
In cold conditions down to 5ºC, use warm water (up to 30ºC) to accelerate strength development.
Adopt normal precautions for winter working with cementitious materials.
High temperature working
At ambient temperatures above 35ºC, store the material in the shade and cool water used for mixing.
Vetobond PB434 mortar, toppings, and renders are cement-based. In common with all cementitious materials, it is a must to cure immediately after finishing by good concrete practice. Use Vetocure XT426 sprayed onto the surface of the finished mortar in a continuous film. In harsh drying conditions, use supplementary curing with polythene sheeting.
Over-coating with protective decorative finishes
Vetobond PB434 mortar repairs are extremely durable and will provide excellent protection to the embedded steel reinforcement within the repaired locations. The surrounding parts of the structure will generally benefit from applying a barrier/decorative coating to limit the advance of chlorides and carbon dioxide, thus bringing them up to the same protective standard as the repair itself.
Saveto recommends the use of the Vetotouch range of protective, anti-carbonation coatings. These products provide a decorative and uniform appearance and protect areas of the structure that might otherwise be at risk from the environment. Apply Vetotouch products over the repair area without prior removal of the Vetobond AB432 curing membrane. This is best achieved by light grit or sandblasting.
Clean tools with water promptly before material hardens. Hardened material can be mechanically removed.
Saw cut the extremities of the repair locations to a depth of at least 10 mm to avoid feather edging and provide a square edge. Break out the complete repair area to a minimum depth of 6 mm up to the sawn edge. Clean the surface and remove any dust, unsound or contaminated material, plaster, oil, paint, grease, corrosion deposits, or algae. Breaking out is not required. Roughen the surface and remove any laitance by light scabbling or grit blasting.
Remove oil and grease deposits by steam cleaning, detergent scrubbing, or by the use of a proprietary degreaser. A pull-off test should then assess the effectiveness of decontamination.
Expose fully any corroded steel in the repair area and remove all loose scale and corrosion deposits; clean steel to a bright condition paying particular attention to the back of exposed steel bars. Grit blasting is recommended for this process.
If corrosion has occurred due to chlorides' presence, the steel should be high-pressure washed with clean water immediately after grit blasting to remove corrosion products from pits and imperfections within its surface.
Soak the substrate thoroughly with clean water and remove any excess before commencement. Prepare a slurry primer with 1 volume of Vetobond PB434 to 1 volume of clean water to 3 volumes of fresh cement. To obtain a smooth consistency, blend the cement slowly into the premixed liquids. Stir the slurry primer frequently during use to offset settlement.
Scrub the slurry primer well into the surface of the concrete. Avoid applying too thickly and avoid ‘puddling.’
The repair mortar, topping, or render must be applied to the wet slurry primer. If the slurry primer dries before applying the mortar, it must be removed and the area reprimed before continuing.
In exceptional circumstances, e.g., where a substrate/repair barrier is required or where the substrate is likely to remain permanently damp, contact Saveto Technical Support.
Vetobond PB434 mortars, toppings, and renders should not be applied when the temperature is below 5ºC and falling. Neither should they be exposed to moving water during application. Exposure to heavy rainfall before the final set may result in surface scour. If any doubts arise concerning temperature or substrate conditions, consult the local Saveto office.
Cementitious mortars and slurries modified with Vetobond PB434 contain cement powders that release alkalies that can be harmful to the skin when mixed or become damp.
During use, avoid inhalation of dust and contact with skin and eyes. Wear suitable protective clothing, gloves, eye protection, and respiratory protective equipment.
The use of barrier creams provides additional skin protection. In case of contact with skin, rinse with plenty of clean water, then cleanse with soap and water. In case of contact with the eye, rinse immediately with plenty of clean water and seek medical advice. If swallowed, seek medical attention immediately – do not induce vomiting.
Refer to Material Safety Data Sheet for further information.
Saveto endeavors to ensure that any advice, recommendations, information it may give, is accurate and correct. It cannot accept any liability either directly or indirectly arising from the use of its products, because it has no direct or continuous control over where or how its products are applied, whether or not in accordance with any advice, specification, recommendation or information given by us. Saveto has the right to change any of the specifications mentioned in the Technical data sheets upon its discretion without prior notification.
Hard copies of TDSs are printed once or twice a year, while our technical data sheets are continuously being updated as per R&D improvements and new 3rd party testing; kindly refer to our website for the latest updated TDSs.
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