Waterproofing Injection grout is a specialized fluid material injected under pressure into cracks, voids, and joints to seal water leaks, restore structural integrity, and prevent further deterioration in concrete and masonry structures. Unlike surface-level sealants that merely cover the problem, injection grout penetrates deep into the crack channel — reaching the root of the damage where leaks actually start for concrete crack repair. This makes it the preferred solution for contractors, waterproofing specialists, and structural engineers working on basements, tunnels, dams, parking structures, and building foundations.
BOSLAI offers a complete injection grout portfolio covering every major resin chemistry — from hydrophilic polyurethane for active water leaks to rigid epoxy for structural crack repair, and flexible acrylate gel for dynamic joints.
Product List
About BOSLAI Injection Grout
Hangzhou Boslai New Materials Co., Ltd. is a China-based injection grout manufacturer and OEM factory with 10+ years of experience. We produce and export water-based polyurethane injection grout, solvent-based polyurethane grout, polyurea injection grout, modified epoxy resin grout, acrylate injection grout, and water-curing grout — serving distributors, contractors, and engineering firms across 30+ countries including the UAE, Saudi Arabia, Nigeria, Vietnam, and the United States.
Application Areas
BOSLAI injection grout are used across the full spectrum of waterproofing and structural repair scenarios:
- Basement and foundation waterproofing — Stop groundwater seepage through foundation walls and floor slabs without excavation
- Tunnel and subway repair — Seal water ingress in transportation tunnels, metro stations, and underground infrastructure
- Dam and reservoir maintenance — Address seepage and crack leaks in water-retaining structures under constant hydrostatic pressure
- Parking structure rehabilitation — Restore expansion joints and crack-sealed decks in multi-level car parks
- Bridge deck waterproofing — Protect bridge infrastructure from chloride ingress and freeze-thaw damage
- Swimming pool and water tank leak repair — Fix leaks without draining or disrupting normal operation
- Sewage and wastewater facilities — Resist chemical attack in harsh, corrosive environments
- Pre-cast panel and segmental construction joints — Seal joints between concrete elements where conventional waterproofing cannot be applied
Types of Injection Grout
Water-Based Polyurethane Injection Grout
Hydrophilic, water based polyurethane injection grout that expands on contact with water. Ideal for sealing active leaks in flowing water conditions. Expands up to 20x its original volume, filling cracks, voids, and voids behind the crack channel. Cures within minutes, stopping water immediately. Suitable for basement walls, tunnel linings, and below-grade structures where water pressure is present. Available in standard and fast-set formulations.
Solvent-Based Polyurethane Injection Grout
Hydrophobic polyurethane Injection Grout (PU injection grout) designed for dry concrete crack repair and damp area where water is not actively flowing. Delivers higher compressive strength than water-based formulations and offers superior chemical resistance. Best used in dam repair, reservoir sealing, and industrial waterproofing applications. Cures to a flexible yet durable elastomer that accommodates minor structural movement without cracking.
Polyurea Injection Grout
Polyurea Injection Grout that sets in seconds under any temperature condition, including below-freezing environments. Exceptional elongation and tensile strength make it suitable for expansion joints, dynamic cracks, and structures subject to thermal cycling. Frequently specified in time-critical projects such as tunnel rehabilitation and industrial facility maintenance where shutdown windows are short.
Acrylate Injection Grout
Low-viscosity Acrylic Injection Grout with hydrophilic properties — absorbs and releases water repeatedly, making it ideal for structures that experience fluctuating water table levels. Flows into hairline cracks as thin as 0.1mm. Remains flexible after curing, accommodating ongoing structural movement. Often used as a curtain grout behind tunnel linings or as a supplementary waterproofing layer behind membranes.
Epoxy Resin Injection Grout
Two-component structural epoxy designed to restore cracked concrete to full structural load-bearing capacity. Achieves compressive strengths exceeding 10,000 PSI and bonds permanently to concrete substrates. Zero shrinkage during cure eliminates voids at the bond line. Specified for structural crack repair in columns, beams, and load-bearing walls where epoxy injection is required by engineering design.
How to Choose the Right Injection Grout？
| Condition | Recommended Product |
|---|---|
| Rushing water, visible water flow | Water-based Polyurethane Injection Grout |
| Dry crack, Damp conditions, no visible flow | Solvent-based Polyurethane Injection Grout |
| Building cracks, construction joints, expansion joints, underwater | Polyurea Injection Grout |
| Visible flow, active joints, chemically aggressive environments | Acrylate Injection Grout |
| Structural strengthening required | Epoxy Resin Injection Grout |
Still unsure? Send us your project photos and crack measurements — our technical team provides free product recommendations within 24 hours.
Why Distributors Choose BOSLAI as Their Injection Grout Supplier?
BOSLAI is a dedicated injection grout exporter and factory with over a decade of experience supplying distributors, contractors, and engineering firms in 30+ countries. Here’s why buyers choose us as their long-term supply partner:
Full Product Range, One Supplier
We manufacture all major injection grout chemistries in-house — polyurethane, polyurea, acrylate, and epoxy — so you can source your complete grout system from a single factory. No juggling multiple suppliers, no inconsistent batch quality.
Custom Formulation for Your Market
Our R&D team adjusts viscosity, reaction time, expansion ratio, color, and hardness to match your local climate and application conditions. Whether you distribute in Southeast Asia’s tropical humidity, the Middle East’s extreme heat, or Northern Europe’s cold winters — we formulate for performance in your environment.
OEM & Private Label Ready
We produce injection grout under your brand name with your logo, packaging design, and label language. MOQ starts at 500 kg — manageable for new market entry or trial orders before committing to full container volumes.
Fast Production and Shipment
Standard orders ship within 3 working days of order confirmation. Full technical documentation package — TDS, MSDS, and third-party test reports — is prepared in advance for customs clearance and end-user project specifications.
English-Speaking Technical Support
Our trade team has experience supporting distributors across the Middle East, Southeast Asia, Africa, and South America. We understand export documentation, incoterms, and the technical questions your customers ask before placing orders.
