Falling tiles
Wall tiles with a reduced bonded area can detach without warning. In bathrooms, kitchens and public buildings this is a safety issue, not a cosmetic one.
Core product
Tile hollowing repair adhesive
A two-component epoxy modified resin. It is injected at low pressure into the void between tile and substrate, where it cures and bonds the tile back into place. The tile is never lifted, so the waterproofing layer is never broken.
A / B two-component
Low-pressure injection
Batch certificate supplied
Factory direct
The problem
A hollow tile looks fine until it does not
A hollow tile has already lost its bond. Nothing about the surface shows it, which is why the problem is usually discovered by sound — a dull note under a knuckle — or by failure.
Hidden water paths
The void under a tile behaves like a channel. Water travels through it and shows up elsewhere as efflorescence, mould or a leak in the room below.
Demolition cost
Removing and re-laying means new tiles, adhesive, waterproofing, waste removal and downtime — often without a matching batch of the original tile.
Data policy
What a data sheet can and cannot tell you
Injection repair resins have no dedicated national standard. Numbers circulated online are mostly manufacturers' typical values, and they disagree with each other. We keep three layers separate.
Standards
Standard numbers, status and limits that can be checked against official registries. We state the date they were last verified.
Industry practice
Common figures from published manufacturer data sheets and B2B listings. Useful for comparing offers — not a Hongyefeng product claim.
Our own figures
Only the application conditions and cure times we can keep consistent. Viscosity and strength are stated on the batch certificate.
Specifications
Published application conditions
Verified 2026-11-07. A batch certificate is issued with every shipment; ask us for the current sheet before you specify.
| Item | Published value | Note |
|---|---|---|
| Form | Two-component liquid (A / B) | Mix ratio stated on the label; do not transfer ratios between grades |
| Injection | Low pressure, stop when resin appears at the next port | High pressure can lift the tile or cause expansion after curing |
| Application temperature | 5 °C to 35 °C | Below 5 °C is not recommended; store in the same range |
| Light foot traffic at 25 °C | 4–6 h | Light traffic only; no load and no water |
| Full cure at 25 °C | 24 h | Wet areas: 24–48 h before water exposure |
| Underfloor heating | Gradual warm-up after 48 h | Switch heating off before work; never go straight to maximum |
| Coverage | Estimate from the actual void volume, then trial-inject | No fixed coefficient; we do not invoice by resin weight |
| Performance data | Stated on the batch certificate | Viscosity and bond strength are not published as fixed values |
Standards buyers ask about
Which standard the industry actually references
These are Chinese standards, since the product is manufactured in China. They are listed so an importer can read a test report without guessing.
| Topic | Reference | What to check |
|---|---|---|
| Product performance | JC/T 547-2017, type R (reactive resin) | Shear bond strength limit 2.0 MPa or above; immersion, open time and thermal shock items. The standard is written for tile installation, so check the declared type on the report. |
| Upcoming revision | JC/T 547-2026, effective 2026-12-01 | Published 2026-06-01, replaces the 2017 edition. Reports issued after that date should name the new version. |
| Emissions | GB 18583-2008 and GB 33372-2020 | One covers specific harmful substances, the other VOC content. A complete report normally groups both. |
| Test method / acceptance | GB/T 12954.1-2008; GB 50210-2018 | Test method standard and the acceptance code for finished tile work. |
Industry practice for AB two-component grades: weight ratios around 4:1 to 6:1, 3 / 6 / 7 kg drums, roughly 15–20 minutes pot life at 25 °C, and laboratory coverage of about 1 kg per 1–1.5 m². These are published figures from other manufacturers, not our specification.
For buyers working to EN 12004 or ISO 13007: the Chinese standard above was developed by modified adoption of ISO 13007-1:2010 and ISO 13007-2:2013, and both systems classify reactive resin adhesives as type R. That relationship makes a report easier to read — it does not turn a Chinese report into an EN 12004 declaration or a CE mark. Standards and export documents sets out what we supply and what we do not claim.
Application
Five steps, low pressure throughout
Survey
Tap every tile. Mark the hollow area and its boundary in chalk. Rule out tenting and water leaks first.
Drill
Place ports across the hollow area, sized to match the injection needle, in the joint wherever possible. Confirm pipe positions on heated floors.
Inject
Mix A / B to the label ratio in small batches. Work from low to high at low pressure; stop when resin appears at the next port.
Seal and cure
Plug the ports and leave the area undisturbed. Light traffic after 4–6 h, full cure at 24 h; no water, no load, no draughts.
Finish
Trim the plugs, colour-match the joints, re-tap every tile to confirm a solid note, and keep the re-test record.
Limits
When injection is not the answer
Cracked or warped tiles
If the tile itself has failed, bonding it down again does not restore it. Replace that tile and treat the surrounding hollow areas.
More than ~70 % hollow
When most of a single tile has lost bond, the cost of injection approaches the cost of replacement. We will tell you when the numbers turn.
Wet or frozen substrate
Standing water in the void, or a substrate below 5 °C, will stop the resin curing properly. Dry and warm the area first, or postpone.
FAQ
Questions buyers ask about this product
How much adhesive does one square metre need?
Estimate from the actual volume of the void, then calibrate with a trial injection on site. There is no fixed coefficient: one square metre with a 1 mm void and one with a 4 mm void need very different quantities. Published figures such as 1 kg per 1–1.5 m² are laboratory data from manufacturers and are not a basis for settlement. We do not invoice by resin weight.
Which standard applies, and how should I read a test report?
There is no dedicated national standard for injection repair resins. The industry normally tests against type R (reactive resin) of JC/T 547-2017 Ceramic Tile Adhesives, where the shear bond strength limit is 2.0 MPa or higher. Environmental limits are covered separately by GB 18583-2008 and GB 33372-2020. JC/T 547-2026 was published on 2026-06-01 and takes effect on 2026-12-01, replacing the 2017 edition. Check the standard version, the declared type (C, D or R), the test items, the batch and the issuing laboratory.
Why do you not publish viscosity or bond strength figures?
Those values belong to a specific tested batch. Publishing one fixed number would be a promise for every future batch. We state measured values on the batch certificate that ships with the order, and can send the current sheet before you specify.
Can it be used on natural stone?
Yes, including marble and granite. Light-coloured stone should always be spot-tested on an inconspicuous area first, because some stones can be stained by resin before it cures.
When is replacement the better option?
When a tile is cracked, chipped or visibly warped, or when the hollow area covers more than about 70 % of a single tile. We will say so rather than sell material that will not solve the problem.
Can you adjust the formulation?
Within limits, yes. Cure speed and viscosity can be tuned for cold climates, hot climates or unusually tight joints. Tell us the conditions on site and we will say what is realistic.
Is a Chinese test report accepted as EN 12004 conformity?
No. JC/T 547-2017 was developed by modified adoption of ISO 13007-1:2010 and ISO 13007-2:2013, so the R classification is comparable — but a Chinese report is not an EN 12004 declaration of performance or CE marking. We hold neither; where a market requires one, its own assessment is agreed before production. See standards and export documents.
Send us the application details
Tile type, substrate, area size and climate. We will come back with the grade, a coverage estimate, the current batch certificate and shipping options.