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RAPIDSTRONG GROUT VM 99 is a high-performance, solvent-free, two-component polyurethane-based duromer injection resin for the structural sealing and strengthening of cracks, joints and cavities in both dry and water-bearing concrete structures. Mixed A+B at 1:1, it gels in 25–30 seconds and achieves >75 MPa compressive strength and 70 MPa flexural tensile strength — tested to DIN EN 196 T1. Capable of curing down to -20°C, with 1–12× volume expansion on water contact depending on ingress, and re-injectable through existing hoses for permanent capillary sealing. Suitable for pressure injection and gravity feed. Industrial use only.
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 VM 99 is a PU crack injection resin for sealing and strengthening cracks, joints and cavities in dry and water-bearing concrete. It is a solvent-free, two component PU resin: Part A and Part B are mixed at 1:1 and injected with a two-component pump, or poured by gravity into V-notched cracks in horizontal slabs.
Low viscosity resin is pressure injected to seal and strengthen them.
Seals rigid joints in both dry and water-bearing concrete.
Injected through packers to seal cavities in rock and masonry.
Expands 1–12× on water contact, depending on the ingress.
Add Part C accelerator at 0.2% where water ingress is heavy.
Used to seal cracks and joints in saline conditions.
Solvent-free resin injected to seal pipe sockets and joints.
Applied from -5°C to +35°C, with -20°C cure possible by formulation.
For structural crack repair in concrete, the cured resin reaches compressive strength above 75 MPa and flexural tensile strength of 70 MPa (DIN EN 196 T1). Viscosity is 225 ± 25 mPas and working time is only 25–30 seconds. As a re-injectable grout it can go in again through existing hoses. Packing is 10 Kgs and 20 Kgs, shelf life 18 months. The concrete must be 28 days cured. Mix only what you can inject immediately, and never thin the product.
Armstrong Chemicals supplies RAPIDSTRONG GROUT VM 99 to sites across Telangana, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu, including Hyderabad, Vijayawada, Bengaluru, Kochi and Chennai.
A two-component polyurethane duromer injection resin with >75 MPa DIN-tested compressive strength, 25–30 second working time, and the ability to cure down to -20°C — for structural sealing of cracks, joints and cavities in dry and water-bearing concrete under demanding site conditions.
Get a QuoteMany injection resins claim "high strength" without quantified test data — leaving specifying engineers unable to verify that the repair meets structural requirements or performs in extreme cold.
>75 MPa compressive strength and 70 MPa flexural tensile strength, both independently tested to DIN EN 196 T1. Cures in 25–30 seconds and works down to -20°C with formulation — structural data you can specify with confidence.
Excellent re-injectable properties through already-installed hoses — allowing follow-up sealing of remaining capillaries and micro cracks without re-drilling or installing new injection ports.
Pressure injection at 40–200 psi for cracks and vertical surfaces; gravity feed for horizontal slab cracks with V-notched preparation — the only injection grout in the Armstrong range with both application methods documented.
Two documented methods — pressure injection for cracks and vertical surfaces; gravity feed for horizontal slab cracks
Drill injection holes at appropriate spacing along the crack; fit packers or nipples and confirm substrate is sound and 28 days cured
⚠️ Eliminate all ignition sources — no smoking, open flames, pilot lights or spark-producing equipment
Pre-stir each component separately, then mix Part A and Part B at 1:1 ratio (add Part C accelerator at 0.2% for heavy water ingress)
⚠️ Working time is 25–30 seconds — mix only the volume required for immediate use; do NOT thin the product
Load a two-component injection pump; inject at slow, steady pressure — low (40 psi) or high (200 psi) as required
For horizontal cracks begin at the widest section; for vertical surfaces begin at the lowest port and work upward — keep all ports open until resin flows from the next port
Protect resin from direct sunlight and excessive heat during injection to prevent uncontrolled polymerisation
Remove uncured material with cleaners; cured material can only be removed mechanically
DIN-tested strength, cold-weather capability, and re-injectable properties — for structural repairs that cannot be revisited.
Compressive strength >75 MPa and flexural tensile strength 70 MPa — both tested to DIN EN 196 T1. Real structural data for specifying engineers who need more than a generic "high strength" claim.
Formulated to cure in below-freezing conditions — enabling structural injection work in cold climates, underground environments and winter construction where other resins fail to cure reliably.
Re-injectable through already-installed hoses — follow-up sealing of remaining capillaries without re-drilling. A capability unique among the Armstrong injection grout range.
Volume expands 1–12 times on contact with water depending on ingress pressure — sealing hairline cracks and heavily water-bearing cavities with a single product.
Available in 10 Kg and 20 Kg two-component packs. Shelf life of 18 months from manufacture. Store in a cool, dry place, out of direct sunlight and extreme temperatures.
⚠️ Contains a flammable monomer. No smoking, open flames, pilot lights or spark-producing tools during application. FOR INDUSTRIAL USE ONLY. Keep out of reach of children. Refer to the Material Safety Data Sheet for handling, storage and disposal. Wash skin thoroughly with hot soapy water after contact.
Requires a two-component injection pump. Do not thin the product. Substrate concrete must be 28 days cured before application. Cured product can only be removed mechanically — not with solvents.
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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View DetailsTwo components high strength Crystalline Blended Elastomeric water Barrier Grout. Complies with BS 1881.
View DetailsROOFEX is a high-performance penetrative crystalline waterproofing system. When applied to concrete, its active ingredients penetrate deep into the substrate and react with cement compounds and moisture — forming multiplied crystals that seal capillaries, pores and hairline cracks from within, transforming porous concrete into an impermeable mass. Effective against both positive and negative hydrostatic pressure. Four application methods: slurry coat, dry shake on fresh concrete, dry pack for joints and fillet sealing at construction joints. For water retaining structures, basements, effluent treatment and sewage plants.
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