Frequently Asked Questions

For a battery room floor in a power substation in the Delhi NCR region where UPS battery banks discharge sulfuric acid electrolyte, what floor system specification is appropriate and how does MC-Dur 1300 compare to tiled acid-resistant floor systems?

Battery room floor specification for power substations and UPS battery rooms in Delhi NCR is a specialist application where the floor surface must withstand the accidental spillage of concentrated sulfuric acid electrolyte (typically 30 to 37 percent H2SO4 in lead-acid VRLA battery electrolyte), as well as the chronic low-level electrolyte mist and condensation that accumulates on the floor surface under battery racks over years of operation. The consequences of floor failure in a battery room — electrolyte penetrating the concrete floor, attacking reinforcement, and releasing hydrogen gas from corroding rebar — are serious and can compromise the structural integrity of the slab and create safety hazards. The two main floor system options for battery room floors in India are: impervious ceramic acid-resistant tiling with chemical-resistant grout, and epoxy mortar screed systems such as MC-Dur 1300. Both approaches can provide adequate acid resistance, but they differ significantly in installation complexity, joint performance, and maintenance requirements. Acid-resistant ceramic tiling uses specially vitrified, dense, low-absorption tiles (typically carbon or silicate tiles to BS 6431 or IS 4457) laid with acid-resistant carbon-filled or furane resin grout. When properly installed, acid-resistant tile and furane grout provides excellent chemical resistance to concentrated sulfuric acid, but the system has critical joint lines — the grout joints between tiles — through which acid can penetrate if the grout is damaged by impact, thermal stress, or movement of the concrete slab. In Indian battery rooms, joint cracking is a common failure mode because the battery rooms are often subject to thermal cycling (air conditioning cycling, seasonal temperature variation) and occasional mechanical impact from battery handling equipment, and the grout joints are the weakest link. Maintaining a crack-free ceramic tile floor over a large battery room floor (typically 100 to 400 square metres in a power substation) for 20 to 30 years (the typical battery system service life) is challenging. MC-Dur 1300 epoxy mortar screed, when used as part of the complete MC-Dur flooring system (MC-DUR 1150 epoxy primer on the prepared concrete, followed by MC-Dur 1300 mortar at 6 to 9 mm thickness, followed by a chemical-resistant topcoat sealer), provides a seamless (joint-free) floor surface that eliminates the joint cracking risk of tiled systems. The acid resistance of the cured epoxy mortar to 37 percent sulfuric acid at ambient temperature is generally rated as good to excellent for continuous immersion periods up to several hours, and is very good for the intermittent contact and surface contamination typical of battery electrolyte spills. The critical technical point is that the MC-Dur 1300 mortar floor must be applied as a complete system without gaps, cracks, or holidays (pinholes) in the coating — any defect in the seamless epoxy mortar surface will allow acid to reach the underlying concrete. For this reason, the specification should include application of at least two full coats of MC-DUR 1150 epoxy primer on the prepared concrete (to seal surface pores), a full 6 to 9 mm application of MC-Dur 1300 mortar using a double-trowelling technique to eliminate surface pinholes, and a final topcoat of a chemical-resistant epoxy sealer to provide a smooth, easily inspectable surface without surface texture that could trap electrolyte residue. The floor should also be detailed with upturned coved skirtings (the floor coating turned up the wall surface by 100 to 150 mm) at all wall-floor junctions to prevent acid from seeping into the wall-floor joint, and an acid-resistant drain pit or collection sump at the low point of the floor to collect and neutralise any electrolyte spill before it can spread. Compared to acid-resistant tiling, MC-Dur 1300 epoxy mortar is typically faster to install (no tile setting time, no grout cure time — ready for traffic in 24 to 48 hours), produces a seamless floor with no grout joints, and is easier to inspect and repair (epoxy mortar sections that are damaged or show signs of deterioration can be patch-repaired without disturbing the surrounding floor). The installed cost of MC-Dur 1300 system for a battery room floor in Delhi NCR is generally comparable to high-quality acid-resistant tiling with furane grout. Space Arc Engineering provides battery room floor specification support and MC-Dur product supply for power, telecommunications, and industrial facilities across Delhi NCR, Ghaziabad, Noida, and Uttar Pradesh.