Avanti AV-290 Fast-Set 10 Gallon Kit

Avanti AV-290 Fast Set is a dual-component hydrophobic polyurethane grout for large below-grade voids and high water flow. It expands on free rise into a rigid, closed-cell foam and does not need water to react.

Large below-grade void filling
High-flow water control with a companion Avanti resin
Pipe and tank abandonment

$548.57

Drop Shipped

Details

Avanti AV-290 Fast Set Hydrophobic Polyurethane Grout, 10 Gallon Kit

Avanti AV-290 Fast Set is a dual-component hydrophobic polyurethane grout for large voids on the exterior of below-grade structures where high water flow is present. Part A and Part B react without water and expand 1,500 to 2,600 percent on free rise into a rigid, closed-cell foam that can take wet/dry cycles. Avanti uses it for probe grouting, curtain grouting, pressure injection, and pipe or tank abandonment. When it is used to slow high water, it is specified with another Avanti injection resin, not as a stand-alone seal.

Key Features

10 gallon pail kit: Part A 47 lbs (21.3 kg) and Part B 40 lbs (18.1 kg), packaged by net weight.
Dual-component hydrophobic MDI-based polyurethane (Part A amber liquid, Part B pale yellow liquid).
Injected at a 1:1 Part A to Part B ratio through a static mixer at the point of injection.
Does not require water to react.
Reacts within seconds and cures to a rigid, impermeable, closed-cell foam.
Free-rise expansion of 1,500% to 2,600%.
Free-rise compressive strength of 20.2 psi; cured density 1.5 lbs/ft³ free rise and 2.5 lbs/ft³ confined.
Withstands wet/dry cycles.
Listed as non-toxic on the current technical data sheet.
Supports probe grouting, curtain grouting, and pressure injection.
When used to slow high water flows, specify with another Avanti injection resin rather than as a stand-alone seal.

Applications

Large void filling on the exterior of below-grade structures.
Pipe and tank abandonments (place in small lifts; the Part A/Part B reaction is exothermic).
Slowing high water flow in below-grade structures, used with a companion Avanti injection resin.
Probe grouting, curtain grouting, and pressure injection.

Technical Specifications

Property	Value
Manufacturer / Product Name	Avanti International AV-290 Fast Set hydrophobic polyurethane grout
Datasheet Revision	Rev. 03.2025 (AV-290 Fast Set Technical Data Sheet)
Product Type	Dual-component, mid-range viscosity, hydrophobic MDI-based polyurethane grout (Part A and Part B)
Mix Ratio	1:1 Part A to Part B, mixed through a static mixer at the point of injection
Water Required	None. AV-290 does not require water to react.
Free-Rise Expansion	1,500% to 2,600%
Reaction / Cure	Reacts within seconds and cures rigid, impermeable, and closed-cell
Uncured Part A	Amber liquid; viscosity 200 cP at 72°F (22°C) ±10% ASTM D-4889; specific gravity 1.250 at 72°F (22°C) ±3%; density 10.43 lbs/gal (1.250 kg/L) ±3%; flash point >200°F (>93°C)
Uncured Part B	Pale yellow liquid; viscosity 600 cP at 72°F (22°C) ±10%; specific gravity 1.041 at 72°F (22°C) ±3%; density 8.69 lbs/gal (1.041 kg/L) ±3%; flash point >200°F (>93°C)
Cured Density	1.5 lbs/ft³ (free rise); 2.5 lbs/ft³ (confined)
Compressive Strength (free rise)	20.2 psi
Packaging	Pail kit sold as 10 gallon kit. Part A 47 lbs (21.3 kg) and Part B 40 lbs (18.1 kg). Packaged by net weight unless otherwise noted.
Storage	45°F to 95°F (7°C to 35°C) in a dry atmosphere. Keep containers tightly closed. Packaged under dry nitrogen to keep moisture out.
Equipment Cleaning	Do not use water. Flush uncured resin with AV-284 Pump Wash. Purge remaining wash and moisture with AV-208 Technical Grade Acetone. Use AV-222 Cleaner for cured resin.
Related Avanti Grouts	AV-202 Multigrout is a different Avanti product, not a size of AV-290. Use AV-290 with another Avanti injection resin when the job is high water flow rather than as a stand-alone seal.

Product documents: AV-290 Fast Set Technical Data Sheet (PDF) | AV-290 FAST-SET Part A Safety Data Sheet (PDF) | AV-290 FAST-SET Part B Safety Data Sheet (PDF)

Frequently Asked Questions

Is AV-290 Fast Set used to fill large below-grade voids?
Yes. AV-290 Fast Set is used to fill large voids on the exterior of below-grade structures where high water flow is present. The dual-component hydrophobic foam expands into the void and cures rigid and closed-cell.

Does AV-290 Fast Set need water to react?
No. Part A and Part B react with each other. Water is not required for the AV-290 Fast Set reaction, which is why Avanti uses it in wet below-grade voids as a hydrophobic grout.

Can AV-290 Fast Set take wet and dry cycles after it cures?
Yes. AV-290 Fast Set cures to a rigid, impermeable, closed-cell foam that can take wet and dry cycles. That is the listed cured performance on the current TDS.

Can AV-290 Fast Set stop high water flow by itself?
No. When AV-290 Fast Set is used to slow high water flows, Avanti specifies it with another Avanti injection resin rather than as a stand-alone seal.

Is AV-290 Fast Set used for pipe or tank abandonment?
Yes. AV-290 Fast Set is listed for pipe and tank abandonment as well as probe grouting, curtain grouting, and pressure injection.

When should I pick AV-290 Fast Set instead of AV-202 Multigrout?
Pick AV-290 Fast Set to fill large below-grade voids with a dual-component hydrophobic foam that does not need water to react. AV-202 Multigrout is a moisture-activated hydrophilic resin for sealing active leaks in large cracks and joints.

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