Description
ARDEX R3E Epoxy Primer and Bonding Agent is a two-component, solvent-free, epoxy resin for use on sound concrete, cementitious surfaces, calcium sulphate-based screeds, and smoothing compounds.
ARDEX R3E Epoxy Primer forms a primer/bonding layer on most dry substrates, especially smooth or dense surfaces in internal and external situations. It can be used as a primer and bonding bridge prior to the application of the ARDEX range of cement-based tiling and flooring products, and on cementitious and calcium sulphate-based screeds. ARDEX R3E Epoxy Primer must be sand blinded to refusal with dry ARDEX Fine Aggregate to give a mechanical key for use as a primer prior to application of the ARDEX K 80/ARDEX SD-T B Industrial Floor System, or other appropriate ARDEX cement-based products and smoothing compounds.
Where substrates are very porous, more than one coat of ARDEX R3E Epoxy Primer may be required to saturate the surface and achieve the desired bonding efficiency. For applications where the relative humidity (RH) of the substrate is in excess of 75%, or where a structural damp proof membrane is not installed, ARDEX DPM 1 C should be used prior to applying ARDEX R3E Epoxy Primer.
Surface Preparation:
The concrete or screed substrate must be hard, sound, and free of dust and other barrier materials such as paint, lime coatings, plaster, curing agents, laitance, adhesive residues, etc., that will inhibit adhesion to the substrate. Use ARDEX DGR Degreaser to remove polish, wax, grease, oil, and similar contaminating substances prior to mechanical preparation.
All substrates must be prepared using appropriate mechanised surface preparation equipment before applying the recommended ARDEX products. Then completely remove any dust and fines by brushing combined with effective industrial vacuum extraction equipment. Mechanical preparation is required to a suitable depth that exposes aggregate and a sound hard surface ready to receive treatment.
Note:
Any joints or cracks in the concrete base where differential movement is anticipated (e.g., movement joints) should be brought through to the finished surface and suitably sealed.
Mixing:
The individual components of ARDEX R3E Epoxy Primer should be thoroughly stirred before being mixed together. The entire contents of the hardener container (Component B) should be poured into the resin container (Component A), and the two materials mixed thoroughly for at least 3 minutes using a heavy-duty slow-speed drill and spiral paddle. Some of the mixed components should be reintroduced back into the hardener container to activate any residue, then poured back into the larger mixing vessel and re-mixed for 30 seconds.
Mixing in this way ensures product consistency, and any resin that remains in the containers after application will cure to allow for easier waste disposal. The mixed primer has a working time of no more than 20 minutes at 20°C, after which all remaining material must not be used but discarded safely.
Note:
Once mixed, ARDEX R3E Epoxy Primer will generate heat and lose working time if left in the mixing container or otherwise kept in bulk. Always wear suitable eye/face protection and gloves.
Application:
Once mixed, the material should be spread over the floor as the self-heating in the container will reduce working time. Apply using a brush or short/medium pile roller. One or more coats may be required to ensure a uniform coating and to compensate for differences in surface porosity.
All movement joints in the subfloor must be carried through the topping and properly sealed. Construction joints and cracks not subject to movement may be overlaid, but should the floor move in any way, these defects will reflect through the system. Isolation joints will need to be allowed for in areas where high thermal movement is anticipated, e.g., around ovens and freezers.
When applying ARDEX Fine Aggregate as a sand blind, ensure this is carried out while the ARDEX R3E Epoxy Primer is still fresh and as the application progresses. Blinding is a full covering of dry ARDEX Fine Aggregate onto the wet ARDEX R3E surface. Excess fine aggregate must be removed by brushing or vacuum after the ARDEX R3E has set, leaving a sandpaper-like finish.
Packaging:
6kg units of ARDEX R3E Epoxy Primer are supplied in pre-gauged metal duo containers. The hardener (Component B) is in the small container and the resin (Component A) is in the large container with sufficient space to add the hardener.
Coverage:
Approximately 24m² per 6kg unit.
Physical Properties:
- Working time: 20 minutes at 20°C
- Walkability: 6-8 hours at 20°C
- Overcoat time: 8 hours at 20°C
ARDEX R3E Epoxy Primer should be allowed to cure prior to the installation of the cement and sand screed or smoothing compound, typically 8 hours at 20°C.
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