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ReadInjection Grouts & Crystalline Waterproofing
RAPIDSTRONG GROUT PFC 79 is a single-component, water-reactive polyurethane polymer injection resin grout. When it contacts water, it initiates a rapid polymerisation reaction — expanding into surrounding pores, cracks and narrow gaps within 36–48 seconds to form a tough, highly flexible solid that stops active water ingress. Non-toxic and non-flammable, it is designed for free-flow pressure injection to seal active leaks, strengthen ground, and protect MS columns and structures against corrosion in basements, retaining walls, underground structures and rock areas.
Figures are controlled laboratory results. Actual site performance varies with substrate, temperature, humidity, application method and workmanship — please confirm the current product datasheet before specification.
RAPIDSTRONG GROUT PFC 79 is a water reactive PU grout supplied as a single component injection resin. It is pumped through packers or nipples set in drilled holes. When it meets water it expands into surrounding pores, cracks and narrow gaps and forms a tough, highly flexible solid that stops active water ingress, so it works as a seepage stopping chemical.
Injected from inside to stop active water ingress through cracks.
Seals leaking cracks and gaps in walls under negative pressure.
Pumped into the fill to solidify leaking zones.
Expands into narrow gaps in rock after pressure injection.
Used to protect MS columns and structures against corrosion.
Injected to seal leaking structures in sewage and industrial waste environments.
Gels in 36–48 seconds, so the leak is blocked quickly.
Free-flow pressure injection is used to strengthen the ground.
For retaining wall leakage and other underground seepage, this single component PU grout gels in 0.6–0.8 minutes (36–48 seconds). Viscosity is 210 cps at 25°C and specific gravity is 1.06 ± 0.04 at 20°C. It is non-toxic and non-flammable, comes in 20 Kgs packing only and keeps for 1 year from manufacture in dry storage. Where there is too little natural water at the injection zone, inject water as well to start the reaction.
Armstrong Chemicals supplies RAPIDSTRONG GROUT PFC 79 to sites across Telangana, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu, including Hyderabad, Vijayawada, Bengaluru, Kochi and Chennai.
A water-reactive polyurethane injection grout that expands into cracks, pores and gaps within 36–48 seconds of contacting water — forming a tough, flexible solid that seals active seepage, consolidates ground, and protects MS structures against corrosion in basements, retaining walls and underground structures.
Get a QuoteCementitious and epoxy grouts require a dry or near-dry substrate — but active leaks keep the surface wet, washing conventional grouts out before they can set.
Water is the trigger, not the obstacle. A polyurethane resin that reacts specifically on contact with water — expanding and polymerising in 36–48 seconds into a flexible solid that stays in the void even under active flow.
Unlike conventional grouts that require dry surfaces, RAPIDSTRONG GROUT PFC 79 uses water as its reaction trigger. Contact with water initiates expansion and polymerisation within 36–48 seconds — sealing active seepage before it can dilute or displace the grout.
Once polymerised, the flexible solid expands and contracts with changes in hydrostatic pressure — maintaining the seal through pressure cycles that would crack or debond a rigid repair material.
Water-reactive, pressure-injected — for the leaks that conventional grouts cannot stop.
Water contact initiates polymerisation in 0.6–0.8 minutes — the fastest gel time of any Armstrong product, sealing active leaks before they can dilute or displace the grout.
A single-component system where water triggers the reaction — no mixing, no pot life, no dry surface required. Expands into pores, cracks and gaps as it polymerises.
Polymerised product expands and contracts with hydrostatic pressure cycles — maintaining the seal through conditions that would crack or debond rigid repair materials.
Seals and consolidates around mild steel columns and reinforced concrete structures — blocking the water ingress pathways that drive ongoing corrosion.
Available in 20 Kg packs only. Shelf life of 1 year from manufacture. Store in dry conditions out of direct sunlight.
⚠️ The polyurethane reaction only initiates on contact with water. If insufficient natural water is present at the injection zone, inject water first or simultaneously. Gel time is 0.6–0.8 minutes (36–48 seconds) — be ready at the injection point; results are immediate.
Application requires low or high pressure pump equipment with specialised packers and nipples — not a brush or trowel product. Contact Armstrong technical support for equipment specification and site methodology guidance.
Identify the crack, void or leaking zone requiring treatment
Drill injection holes at appropriate spacing and depth — angle towards the centre of the crack or void
Fit packers or nipples into the drilled holes
Fill the injection gun or pump with RAPIDSTRONG GROUT PFC 79
If insufficient natural water is present at the injection zone, also inject a sufficient quantity of water to initiate the polyurethane reaction
Begin injection using a low-pressure hand-operated pump; use a high-pressure pump with special packers for specific conditions
Gel time is 0.6–0.8 minutes (36–48 seconds) — results are immediately visible; monitor the injection point closely
Once the void or crack is sealed and no further ingress is visible, cease injection and remove packers
Seal injection holes after treatment
Full specifications, application systems, layering guides, and coverage tables.
Request a quote and your nearest Armstrong distributor will contact you directly.
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