How to Find a Reliable PU Injection Grout Supplier and Exporter? PU injection grout — also called polyurethane injection resin, water-reactive PU resin, chemical grout, or injection gel — is the product that stops water travelling through concrete cracks, construction joints, tunnels, basements, elevator pits, and retaining walls. The market is built on two chemistries: hydrophilic and hydrophobic. Knowing exactly what each one does, and buying it from a manufacturer that exports it every week, is the difference between a repair that lasts and a call-back.
What Is Hydrophilic PU Injection Grout?
Hydrophilic PU injection grout — also written as water-soluble polyurethane grout, water-reactive PU injection resin, PU gel grout, gel-type injection resin, water-activated injection grout, hydrogel injection grout, elastic PU waterstop resin — is designed for leaks where water is actually moving. Well-known reference products in this family include Sika Injection-301, MC-Injekt 2300 top from MC-Bauchemie, De Neef Hydroactive from GCP, Alchatek Prime Gel and Hydro-Seal 150, and BASF MasterInject 1380 — all water-reactive resins that cure into an elastic gel.
The working principle is simple. The resin reacts with water in about 20 seconds and cures into a flexible gel, so one part of grout binds up to 20 times its own volume of water. Because the reaction depends on water, hydrophilic grout only performs where water keeps flowing. Injected into a dry or inactive crack it simply never gels, which is the most common mistake on site. Typical applications are active crack leaks, tunnel segment joints, basement and lift-pit walls, wet shafts, and curtain grouting behind a wall where a continuous water path exists.
What Is Hydrophobic PU Injection Grout?
Hydrophobic PU injection grout — traded as oil-based polyurethane grout, oil-soluble injection resin, hydrophobic PU foam resin, water-activated expanding foam, solvent-free one-component PU foam, closed-cell PU foam grout, expanding waterstop foam — handles the opposite situation: damp concrete, weeping joints, or a crack that is not leaking at the moment of injection.
Reference products here include Sika Injection-110 and SikaFix HH, MC-Injekt GL-95, De Neef Hydrofoam, Alchatek Prime Flex 900 XLV, and BASF MasterInject 1030. A trace of moisture is enough to trigger the reaction: the resin foams into a semi-rigid closed-cell foam that expands 20 to 30 times its original volume, reaching full expansion in about 25 minutes, filling voids and pushing residual water out of the crack.
Hydrophobic grout must not be used where water is flowing. In an active stream the foam is washed out of the crack before it can seal, because it reacts with the first water it meets rather than waiting for the leak to be under control. For running water, choose the hydrophilic grade instead.
Hydrophilic vs Hydrophobic: Which Grade Fits the Job?
| Hydrophilic PU grout | Hydrophobic PU grout | |
| Water condition on site | Active, flowing water | Damp, weeping, or no active leak |
| Reaction time | Gels in about 20 seconds | Foams, full expansion in about 25 minutes |
| Water uptake / expansion | Binds up to 20× its volume in water | Expands 20–30× into closed-cell foam |
| Final body | Elastic, flexible gel | Semi-rigid foam |
| Do not use where | There is no water to react with | Water is flowing |
BOSLAI Manufactures and Exports Both Types
BOSLAI (Hangzhou Boslai New Materials Co., Ltd.) manufactures and exports both hydrophilic and hydrophobic PU injection grout, and ships regularly to buyers in Vietnam, the UAE, Saudi Arabia, the Philippines, Thailand, Malaysia, Indonesia, India, Europe, Africa, and the United States. Both chemistries are produced in several quality grades — economy, standard, and premium — so a distributor can match a price point to each market instead of pushing one product to every customer.
OEM and private label production is available: your brand, your language on the label, your carton design, and your packing specification, from 10 kg and 20 kg pails to 25 kg drums and IBC where required. Technical data sheets are supplied on request, and free samples are available so importers can verify gel time, expansion ratio, and adhesion on a real job before committing to a full container.
BOSLAI is currently looking for distributors, wholesalers, and importers with freight forwarding capability in these markets. If you already handle chemical cargo and want a cost-effective PU injection grout line to add to your portfolio, BOSLAI would like to work with you.
We’ll get back to you within 24 hours. Emails occasionally end up in the spam folder, so we kindly ask you to provide your WhatsApp so we can reach you urgently if needed.
FAQ
Q1: What is the difference between hydrophilic and hydrophobic PU injection grout?
Hydrophilic PU injection grout bonds with water to form an elastic gel and is used for active leaks. Hydrophobic PU injection grout reacts with minimal moisture and expands into a semi-rigid closed-cell foam, and is used for damp or weeping joints without flowing water.
Q2: Which PU injection grout should I use for a leak with running water?
Hydrophilic PU injection grout bonds with water to form an elastic gel and is used for active leaks. Hydrophobic PU injection grout reacts with minimal moisture and expands into a semi-rigid closed-cell foam, and is used for damp or weeping joints without flowing water.
Q3: Can BOSLAI supply PU injection grout with OEM private label?
Yes. BOSLAI manufactures and exports both hydrophilic and hydrophobic PU injection grout in several quality grades, with OEM private label, your own brand and carton design, custom packaging, free samples for on-site testing, and technical data sheets provided before you place an order.
Q4: How do I choose a reliable PU injection grout supplier or exporter?
Look for a supplier that manufactures the resin itself, exports chemicals regularly, offers both chemistries in several grades, provides technical and safety data sheets before ordering, and ships free samples for testing. BOSLAI meets all five requirements for global buyers.
Related Products
- Water-Based Polyurethane Injection Grout
- Solvent-Based Polyurethane Injection Grout
- Polyurea Injection Grout
- Water-Based Polyurethane Waterproof Coating
Related Posts
- SikaFix Alternative: 5 Reasons Importers Switch to BOSLAI PU Injection Grout
- Best Joint Filler for Expansion Joints: 7 Powerful Reasons Polyurea Grout Beats Polyurethane Sealant
- Polyurethane Injection Grouting: Complete Procedure Guide
- JS Polymer Cement Waterproof Coating vs Polyurethane Waterproof Coating: A Comparative Analysis
