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 must be cleaned and filled with an epoxy filler prepared from Nanten HM Bio Low VOC and fine filler sand. Larger and more extensive leveling or overfilling can be done using a filling/leveling compound made from Nanten SL Bio Low VOC and filler sand (grain size e.g. 0.1–0.6 mm).
Priming treatment 1
Priming is carried out using undiluted Nanten HM Bio Low VOC. The primer must seal all pores in the concrete to form a dense and continuous film on the surface. Pre-mix Part A and Part B of the primer in their own containers. Combine the components in a mixing container and mix with a low-speed mixer for approximately two minutes, avoiding air entrainment. Copper tapes for grounding are installed as specified onto the cured HM Epoxy surface. The actual conductive priming treatment (2) is carried out using Nanten ESD Primer in accordance with the instructions.
Priming treatment 2
Conductive priming layer using Nanten ESD Primer. Pre-mix Part A and Part B of the ESD Primer in their own containers. Combine the components in a mixing container and mix with a low-speed mixer for approximately two minutes, avoiding air entrainment.
Apply at a minimum of 0.35 l/m² to ensure proper conductivity. Pour the mixed compound onto the floor in a continuous bead and spread with a roller. The primer layer must be uniform in thickness.
Mixing of components
Pre-mix Part A and Part B of SL Bio ESD in their own containers. Estimate the required amount of mixture based on the size of the area and the working time. Combine the components in the correct ratio and mix with a low-speed mixer for approximately two minutes, avoiding air entrainment. Ensure that material on the sides and bottom of the container is thoroughly mixed.
Mixing ratio
Part A: 3 parts by volume
Part B: 1 part by volume
Coating
If the primer has cured for more than two days, the surface must be roughened by sanding and sanding residues removed. The mixed compound is poured onto the floor in a puddle or continuous bead and spread with a smoothing trowel to the desired thickness. As work progresses, the surface is back-rolled with a metal spiked roller to remove air bubbles.
Note: Inadequate mixing of the epoxy coating may result in uneven curing, and an incorrect mixing ratio may prevent the material from curing at all. Do not scrape and apply material from the sides of the mixing container onto the floor. Carefully use the metal spiked roller to achieve an even surface finish.
Floor maintenance
For products classified as M1, cleaning is recommended using only water or a detergent that does not contain solvents.
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