UltraTech Mykrofill
A single-component, iron-free injection grout that flows into hairline cracks, honeycombs and post-tensioning ducts to seal water and rebuild strength in distressed concrete.
What is it?
A polymer-modified, crystalline cement grout supplied as a ready-to-mix powder — add water, pump it, and it drives into cracks and voids under pressure.
Where is it used?
Honeycombed columns, beams and slabs; cracked RCC and masonry; post-tensioning ducts; and below-grade structures such as basements, retaining walls and water tanks.
Why use it?
It combines pumpable fluidity, negligible shrinkage and zero metallic iron, so it fills fine voids fully and never rusts or stains the concrete it protects.
How is it applied?
Mixed with clean water alone, then pumped through pre-fixed nipples or packers at low-to-moderate pressure until refusal.
About UltraTech Mykrofill
Concrete rarely fails the way textbooks describe it. On real sites, the problems show up as honeycombed pockets behind congested reinforcement, hairline cracks that appear weeks after deshuttering, or a post-tensioning duct that never quite got filled during the pour. None of these are fixed by patching the surface — the defect sits inside the member, and water keeps finding its way through long after the concrete looks finished. UltraTech Mykrofill exists for this situation: a single-component, polymer-modified crystalline cement grout meant to be pumped into the structure rather than trowelled onto it.
What makes it useful on site is how little room for error it leaves. There is no resin to weigh out, no hardener ratio to get wrong, and no metallic iron to rust and stain the surface later — just clean water added to the powder and stirred to a pumpable consistency, deliberately thin because a grout that cannot enter a hairline crack is useless for injection. Space Arc supplies and applies Mykrofill across Delhi NCR for basement leak sealing, honeycomb rectification and duct grouting — one of the products we reach for when a defect needs filling from the inside out.
The technical insight
Mykrofill’s performance comes down to particle fineness and shrinkage control working together. The cement and specialty fillers are ground fine enough, and dispersed well enough by the polymer modifier, that the slurry travels through crack widths and micro-voids a standard repair mortar would simply bridge over. Once in place, the crystalline component keeps working after the initial set — as moisture reaches the grout over time, it forms further crystalline growth within the pore structure, giving injected cracks a self-sealing character rather than a one-time plug. Because plastic shrinkage is negligible, the grout does not pull away from the crack faces as it cures — the most common reason ordinary cement-slurry injections fail within a season. Skipping metallic iron is a durability choice too: iron particles in cheaper grouts rust, expand, and reopen the crack they were meant to close.
Where it is used
- Filling honeycombed and voided concrete in columns, beams and slabs
- Sealing dormant hairline and structural cracks in RCC and masonry
- Pressure grouting post-tensioning cable ducts in prestressed members
- Injection waterproofing of basement walls, raft slabs and retaining walls
- Sealing water-retaining structures such as UG tanks, STPs and WTPs
- Consolidating distressed or delaminated concrete sections
Key advantages
- Single-component system — only water is added, cutting site batching errors
- High fluidity penetrates hairline cracks under controlled pressure
- Zero metallic iron content, so there is no rust staining or corrosion-driven spalling
- Negligible plastic shrinkage keeps the grout in full contact with surrounding concrete
- Develops useful compressive strength, up to around 30 MPa
- Simple mechanical mixing, with no resin ratios or pot-life pressure to manage
Limitations & considerations
- Not intended for free-flow grouting under machine bases or baseplates — precision grouts handle that job
- Needs an injection pump and a trained crew, not a hand-applied, trowel-on product
- Compressive strength is moderate compared with dedicated high-strength precision grouts
- Not a substitute for flexible resin injection where a crack is still actively moving
- Consumption varies with crack width and void volume, so it needs a site trial rather than a fixed rate
Selection & best practice
Trace every visible crack and mark honeycombed zones, then fix nipples or packers along the line at a spacing set by crack width and member thickness. Seal the crack face between nipples with a fast-setting compound so pressure doesn’t escape at the surface, and let that seal cure before injecting. Mix Mykrofill with clean water only, using a mechanical stirrer, to a lump-free, pumpable slurry — extra water only raises shrinkage and lowers strength. Inject from the lowest nipple upward, moving to the next port only once grout appears there or the pump reaches refusal, so trapped air is pushed ahead rather than sealed behind it. Keep pressure low to moderate; forcing the pump is the most common cause of blown seals. Leave nipples undisturbed until set, then cut them flush. On water-retaining structures, a water test after curing is worth the extra day.
Specifications
| Product type | Single-component, polymer-modified, crystalline cementitious injection grout |
| Metallic iron content | Nil (corrosion- and rust-stain-free) |
| Plastic shrinkage | Negligible / nil |
| Consistency | High fluidity for deep penetration under pressure |
| Compressive strength | Up to approx. 30 MPa |
| Mixing liquid | Clean potable water only, mixed with a mechanical stirrer |
| Application method | Pumped/injected through pre-fixed nipples or packers at low-to-moderate pressure |
| Pack size | 25 kg bag |
| Coverage / consumption | Not fixed — depends on crack width and void volume; determine by site trial mix |
Industry use cases
Residential and RCC-framed buildings
Rectifying honeycombed columns and beams found during deshuttering or pre-handover snagging.
Industrial and warehouse structures
Sealing leaking basement and retaining walls where water tracks in through shrinkage cracks.
Bridges and prestressed structures
Grouting post-tensioning ducts to protect stressed cables from corrosion after stressing.
Water and wastewater infrastructure
Injection waterproofing of UG tanks and STPs where coatings alone cannot stop seepage.
Frequently asked questions
How is Mykrofill different from a repair mortar?
Do I need special equipment to use it?
Is it safe to use near reinforcement steel?
Will it stop a crack that keeps moving with temperature?
Can it be used for machine foundation grouting?
How we position UltraTech Mykrofill
Mykrofill covers one job well — pressure injection into cracks, voids and ducts — and Space Arc pairs it with the rest of UltraTech’s repair and waterproofing range rather than treating it as a stand-alone fix. Where the defect is a large void under a machine base plate needing free-flow, high-strength grouting instead of injection, we specify Fosroc’s Conbextra GP1, GP2 or GP3 precision grouts — a different chemistry, which we also supply as Fosroc’s authorised distributor. Where a crack is still actively moving, a flexible polyurethane or epoxy resin is the more honest recommendation. For the finishing that usually follows — surface crack filling, waterproof coatings, or repair mortars — UltraTech’s own product lines complete the scope.
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