Base requirements and coating conditions
The concrete strength class must be at least C25/30 with a wear resistance class of 3. The relative humidity of the concrete must be below 95%, and the surface temperature must be at least +3°C above the dew point. During application and curing, the temperature of the air, surface, and coating must remain above +15°C, and the relative humidity of the air must be below 80%. Always ensure the suitability of the coating for the intended substrate.
New concrete floor
Cement laitance and any uncured cement must be removed by surface grinding or shot blasting. All loose and adhesion-reducing material must be removed, and the surface must be thoroughly vacuumed to remove all cement dust.
Old concrete floor
Cement laitance and deteriorated concrete must be removed by grinding or shot blasting. All loose and adhesion-reducing material must be removed, and the surface must be thoroughly vacuumed. Dirty floors should be washed and rinsed with a synthetic detergent before any further surface preparation. Any existing old paint film must be completely removed from the substrate.
Patching
Small holes and cracks are cleaned and filled with an epoxy putty made of, for example, HM Bio Epoxy and fine filler sand.
Priming treatment 1
Priming is done with Nanten HM Bio Epoxy. On damp concrete substrates with a relative humidity above 95%, a moisture-tolerant primer such as Nanten M Primer must be used. The primer must seal all pores in the concrete to form a dense and continuous film on the surface. Copper tapes used for grounding are installed on the cured surface of HM Epoxy. The actual priming step of the ESD system is carried out using conductive Nanten ESD Primer according to instructions.
Priming treatment 2
Conductive priming layer with Nanten ESD Primer. Apply at a minimum rate of 0.3 l/m² to ensure functionality. Broadcast ESD sand “spikes” onto the primer.
Mixing
Pre-mix Part A and Part B of HM ESD Epoxy in their own containers. Estimate the required amount of mixture based on the size of the area to be treated and the working time of the product. Combine the components in the correct ratio and mix with a low-speed mixer for approximately two minutes, avoiding air entrapment in the mixture. Add 50% conductive Nanten ESD sand and 50% color sand while mixing. Continue mixing for about one minute. Mixing of the binder and filler sand can also be done using a pan mixer or concrete mixer.
Mixing ratio
Part A: 2 parts by volume, Part B: 1 part by volume
Filler sand: 50% ESD sand and the remaining filler sand as selected
Coverage
At 4 mm film thickness
Resin consumption approx. 1.3 l/m²
For priming: 0.2–0.3 l/m²; the second priming layer is applied with Nanten ESD Primer
Resin consumption for top coating: 0.20–0.25 l/m²
Coating
The mixed material is poured onto the floor in a continuous bead and spread with a notched trowel to the desired thickness. After spreading, the material is compacted manually with a steel trowel or mechanically to achieve a smooth surface.
Top coating
Once cured, the compacted trowel-applied coating must be sealed with thinned Nanten HM ESD Epoxy. We recommend applying two thin coats to achieve a hygienic and easy-to-maintain surface. Excessively thick topcoat layers may impair the conductive properties of the floor.
Coved skirtings
Coved skirtings are formed using the epoxy trowel mortar, stiffened with thickening fiber (Sylothix) to facilitate application. The skirtings are typically formed to a height of 100 mm.
Storage and handling of waste
See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank