Water based surface retarder for concrete
Vetotard XT428 is a single component, concrete surface retarder, the product is available in a number of grades used depending on the depth of surface retardation required. Vetotard XT428 is a chemical retarder directly applied to the form-work. They are designed to provide a simple economical method of exposing aggregates in freshly poured facedown pre-cast concrete or face-up panels or slabs. The action of these products is to retard the hydration of cement at the surface matrix of the concrete.
Vetotard XT428 supplied in 25 Liter Pail. Coverage: 5 - 8 m2/Liter.
Shelf life 12 months under normal warehouse storage conditions. Vetotard XT428 should be protected from frost. If the material becomes frozen, it should be completely thawed and then thoroughly mixed before use.
Depth of Retardation
Vetotard XT428 is available in three etch depths. The material in every pail is color coded to show the particular depth of exposure.
Purple - light etch from 1 - 2 mm
Blue - medium etch from 2 - 4 mm
Black - deep etch form 4 - 6 mm
The above is a guide based on Grade 30 concrete, medium workability, 20 mm maximum size aggregate.
Vetotard XT428 should be applied in one even coat using a brush or roller. Coverage rate is 5 - 8 m2 per liter.
It is possible to spray Vetotard XT428 but would need to dilute with 5 - 10% water to achieve sprayable consistency. Stir well before use.
Before concrete is placed, the surface retarder should be dry for face-down application. This typically takes 15 to 60 minutes depending on ambient conditions whereas in the case of face-up, Vetotard XT428 should be applied immediately after placement of concrete is complete in wet conditions.
Immediately after the concrete molds are stripped, the retarded surface of the concrete can be exposed either by brushing and/or water washing. Water washing should be carried out using a high pressure water jet at between 1000 and 2000 psi (5 to 10 N/mm2). Dry brushing requires the use of a wire brush.
To bring out the full color of the aggregate for decorative finishes, wash the concrete face with a dilute solution of hydrochloric acid (5% concentration).
Clean all tools and equipment with water immediately after use.
Timber form-work should be sealed with a suitable polyurethane sealer. Form-work and molds must be clean and dry before application.
Vetotard XT428 is essentially non-toxic unless ingested in large quantities.
Skin and eye contamination - May be removed by washing with water. If eye contact is severe or signifi cant ingestion occurs medical advice should be sought.
Vetotard XT428 is non-flammable.
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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