Fosroc Nitomortar PE
A two-component polyester repair and jointing compound that gains structural strength within hours, cures down to 0 degrees C, and needs no primer.
What is it?
A two-component, pre-weighed polyester resin repair and jointing mortar available in a standard grade and an aggregate-extendable Concrete grade.
Where is it used?
Emergency concrete reinstatement, precast repair, kerb and manhole bedding, floor void infilling and fixing of slabs, kerbstones and tiles.
Why use it?
It develops strength faster than cement mortars, becoming stronger than concrete within two hours, and bonds without a substrate primer.
How is it applied?
Mix resin and hardener on site, trowel or pour into a prepared, saw-cut recess at 5 mm minimum thickness, and compact firmly.
About Fosroc Nitomortar PE
Nitomortar PE is Fosroc’s polyester-based answer to repairs that cannot wait for cement to gain strength. It arrives as a two-component kit: a liquid polyester resin and a powdered hardener, both pre-weighed so that on-site mixing stays consistent from pack to pack. The hardener system lets a crew dial the same material from a stiff trowellable mortar to a pourable fluid without meaningfully changing set times or final strengths, which is why one product covers everything from arris reinstatement to bedding kerbstones and fixing manhole frames. Where larger voids need filling, the Concrete grade accepts site-added sand or aggregate, stretching yield and cutting cost per litre placed.
The appeal for Indian contractors is speed under pressure. On a live warehouse floor, a loading bay, or a road that has to reopen the same shift, Nitomortar PE reaches strengths equivalent to mature concrete within two to six hours above 15 degrees C, and it will cure in damp, wet, or even underwater conditions down to 0 degrees C. It bonds to concrete, masonry, brick, and stone without a separate primer, and once cured it shrugs off water, petrol, oil, and most corrosive chemicals. Space Arc Engineering supplies it as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, with technical guidance on grade and consistency selection.
The technical insight
The performance comes from the polyester resin chemistry rather than hydration. Cement mortars need water to react and cure over days; Nitomortar PE cures by a resin-hardener reaction that runs to completion in hours and is largely indifferent to moisture, which is why it works on damp and submerged substrates where cementitious repairs would fail. The formulation keeps linear shrinkage to roughly 0.8 percent with no further movement after cure, so the patch stays keyed into the recess. The resulting bond to sound concrete is stronger than the tensile strength of the concrete itself, meaning failure, if it comes, occurs in the parent slab and not at the interface. At a flowable consistency the standard grade reaches 100 N/mm2 compressive, 28 N/mm2 flexural, and 14 N/mm2 tensile strength at 7 days to BS 6319, comfortably exceeding structural concrete.
Where it is used
- Fast and emergency reinstatement of damaged concrete where downtime must be minimised
- Repair and reprofiling of precast concrete units, damaged risers and stair treads
- Infilling hollows, holes and voids in concrete floors before overlaying
- Bedding and fixing kerbstones, manhole sets, gully frames and coping stones
- Fixing brick slips, ceramic tiles and stone slabs where fast grip is needed
- Repair of larger voids using the aggregate-extendable Concrete grade
- Repairs on damp, wet or below-water substrates that rule out cement mortars
- Jointing and reprofiling of masonry and brickwork requiring early strength
Key advantages
- Develops strength faster than concrete, becoming stronger than concrete within two hours
- No substrate primer required, with excellent bond to concrete, masonry, brick and stone
- Cures under damp, wet or underwater conditions and works down to 0 degrees C
- Versatile consistency, from trowellable mortar to pourable fluid, without altering strength
- High resistance to water, petrol, oil and most corrosive chemicals once cured
- Pre-weighed two-part packs give consistent, repeatable site mixing
- Low wastage as part packs can be mixed to the quantity required
- Concrete grade accepts site aggregate to fill larger voids economically
Limitations & considerations
- Not recommended in contact with ketones, phenols, strong alkalis or oxidising agents
- Must not be applied below 0 degrees C or over substrates contaminated with frost or ice
- Should not be applied to damp or wet surfaces where bond is the sole reliance, nor exposed to moving water during placement
- Working time shortens sharply as temperature rises, dropping to about 15 to 20 minutes at 25 degrees C for the standard grade
- The resin is flammable with a flash point of 29 degrees C and must be kept away from ignition sources
- Single-application thickness is limited to 12 mm for the standard grade and 40 mm for the Concrete grade; deeper work must be built up in layers
Selection & best practice
Saw-cut the repair perimeter to at least 5 mm to give a square edge and avoid feather-edging, then break out to a minimum 5 mm depth and remove all dust, laitance, oil and unsound material. Expose and grit-blast any corroded steel to bright metal and prime it with Nitozinc primer before proceeding; no substrate primer is needed for the mortar itself. Pour the resin into a clean bucket, add the hardener slowly with continuous stirring, and mix for about three minutes to a uniform consistency, batching only what can be placed within the pot life. Trowel firmly into place for full compaction, keeping the first layer slightly resin-rich on dense substrates, and build thicker sections in layers with a scratch-keyed surface between coats applied 8 to 24 hours apart. Restrict plan areas to 0.25 m2 for the standard grade and 0.50 m2 for Concrete, using a chequerboard sequence on larger areas, and clean tools with Nitoflor Sol immediately after use.
Specifications
| Base | Two-component polyester resin (pre-weighed resin plus powdered hardener) |
| Compressive strength (7 days, flowable, BS 6319) | 100 N/mm2 (standard and Concrete grades) |
| Flexural strength (7 days, BS 6319) | 28 N/mm2 standard grade; 25 N/mm2 Concrete grade |
| Tensile strength (7 days, BS 6319) | 14 N/mm2 standard grade; 12 N/mm2 Concrete grade |
| Strength gain | Equivalent to mature concrete within 2 to 6 hours above 15 degrees C |
| Application thickness | Standard grade 5 to 12 mm; Concrete grade 5 to 40 mm per layer |
| Working time (standard grade) | 45 to 60 minutes at 15 degrees C; 15 to 20 minutes at 25 degrees C |
| Packaging and yield | 5 litre packs; PE approx 5.0 litres/pack, Concrete grade 15 to 27.5 litres/pack with aggregate |
| Shelf life | 9 months at 20 degrees C in dry, unopened original packs |
Industry use cases
Warehousing and logistics
Reinstating spalled floor joints and worn arris edges in busy distribution centres where the aisle must return to forklift traffic within the same shift.
Roads and highways
Emergency patching of concrete pavements, kerb bedding and manhole frame fixing where the carriageway has to reopen in hours, not days.
Precast and infrastructure
Repair and reprofiling of precast units, damaged stair risers and treads on site, restoring load-bearing profiles quickly before installation continues.
Water-retaining and marine structures
Repairs on damp or submerged concrete such as tank walls and channel edges, exploiting the resin’s ability to cure under wet and underwater conditions.
Industrial and chemical plants
Void filling and floor repairs in areas exposed to oil, fuel and dilute chemicals, where the cured polyester resists attack that would degrade cement mortars.
Frequently asked questions
Is Nitomortar PE an epoxy mortar?
How quickly can we return the area to service?
Do we need to prime the concrete first?
What is the difference between Nitomortar PE and Nitomortar PE Concrete?
Can it be used in cold or wet weather?
How much material do we need per pack?
How we position Fosroc Nitomortar PE
Nitomortar PE is the go-to when speed and moisture tolerance matter more than the ultra-high chemical resistance of an epoxy. Within the Fosroc repair family, step up to Nitomortar S, a three-component structural epoxy mortar, when you need maximum chemical resistance or deeper structural rebuilds; choose Nitomortar FC, a fine polymer-modified cementitious mortar, for fair-faced facade and cosmetic work where appearance is critical. Pair any of these with Nitozinc primer to protect exposed reinforcement before patching. Where the repair is a thin bonded overlay rather than fast jointing, our wider range across Sika and Dr. Fixit offers cementitious repair systems worth comparing. Space Arc can specify the right grade and consistency for your substrate, temperature and turnaround.
Related Concrete Repair products
Source Fosroc Nitomortar PE for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.