Does the tile sound hollow after laying? The adhesive did not penetrate the back — voids remained, the tile loosens. It does not slip on walls, spreads on floors. No voids, no cracks, no flaking. This is Kerakoll H40 Gel.
Made in Italy. Kerakoll, Sassuolo — building material innovation since 1968. H40 Gel is the successor to Biogel No Limits, the central product of the renewed H40 tile adhesive line.
Large format (up to 160x320 cm): no hollow sounds, no cracks — thixotropic & liquid mix, full bedding
Underfloor heating: adhesion does not break — S1 deformability, -40 °C – +90 °C heat resistance
Same for wall and floor: no need to change bags — less water for walls, more for floors
Gres, ceramic, stone, mosaic, glass: no product mistakes — one tile adhesive for everything
Terrace, pool, facade: does not flake after frost — adheres underwater and after freeze-thaw cycles
60 minutes open time: no rush with large tiles — stress-free double application
Safe for indoor use: EC1 Plus — very low VOC emissions
Successor to Biogel No Limits: same category, updated formula
Structural gel tile adhesive (one-component, cement-based)
Class
C2 TE S1 (EN 12004), GT-2
Material consumption
≈ 1.25 kg/m²/mm
Layer thickness
2–15 mm
Open time
≥ 60 minutes (+23 °C)
Pot life
≈ 4 hours (+23 °C)
Walkable / grouting time
≈ 24 hours (+23 °C)
Heat resistance
−40 °C – +90 °C
Packaging
25 kg bag, grey or white
Storage
≈ 12 months
What is it suitable for?
Tiling materials: Gres tiles in all sizes — from 30x30 cm tiles up to 160x320 cm large format slabs. Thin and fabric-reinforced laminated panels. Ceramic, marble, natural stone, glass mosaic, terracotta, clinker, thermal and acoustic insulation panels.
Special: pool (≈ 14 days waiting before filling), sauna, wellness, facade, street furniture
Not suitable for:
Substrate unevenness over 15 mm — first use self-leveling (Planogel Ultra)
For reactive waterproof membrane (RM type, EN 14891) — H40 Extreme reactive tile adhesive is required
Does not replace waterproofing on outdoor water-exposed surfaces by itself
Different task? Fast handover or cold season: H40 Advanced with accelerated adhesion. Moving substrate, facade, large slab reinforced with fabric: H40 Tech ultra-flexible. Industrial kitchen, lab, chemical exposure: H40 Extreme hybrid reactive.
Frequently asked questions
Why does a tile sound hollow after installation? The tile adhesive did not fully saturate the back — voids remained underneath. With a thixotropic & fluid gel tile adhesive (e.g., Kerakoll H40 Gel), you get full bedding with no hollow spots.
Which tile adhesive is suitable for large slabs? One that fully saturates the back of the tile and has at least 60 minutes open time. Kerakoll H40 Gel delivers both — tested up to 160x320 cm large slabs with a thixotropic & fluid mix.
What is a thixotropic & fluid mix, and why does it matter? Thixotropic = tile does not slip on the wall. Fluid = spreads on the floor and fills voids under the tile. That’s why the same bag works for walls and floors — less water for walls, more for floors.
How many m² does a 25 kg bag of H40 Gel cover? Material requirement ≈ 1.25 kg / m² / mm layer thickness. A 25 kg bag covers ≈ 4-5 m² for small tiles (4-5 mm bedding), ≈ 2-2.5 m² for large slabs (8-10 mm, double application).
Does it replace Biogel No Limits? Yes. H40 Gel is the same category, an updated formula as part of the renewed H40 product line.
Which tile adhesive is suitable for underfloor heating? Kerakoll H40 Gel is tested for all four common underfloor heating systems: wet, electric, heat-distributing plates, and milled. The S1 deformability and -40 °C to +90 °C temperature resistance withstand heating cycles.
What does the C2 TE S1 class and GT-2 mean? C2 TE S1 is the EN 12004 certification — high adhesion, extended open time, deformable. GT is Kerakoll’s own system test for torsion and bending, GT-2 = medium-high deformability.
Can the tile adhesive be applied on tiles? Yes, on existing fixed, intact tiling. The surface must be clean and free of grease. On absorbent cement substrates, priming is required beforehand (Active Prime Grip).
How much water is needed for a 25 kg bag? For floors (more fluid): grey ≈ 9.5 l, white ≈ 8.25 l. For walls (more thixotropic): grey ≈ 7.5 l, white ≈ 6.25 l.
Can it be used in pools or showers? Yes for pools — filling after ≈ 14 days. For showers, waterproofing is required first (Aquastop Nanogum or Nanodefense Eco), then H40 Gel is applied.
H40 System
H40 is Kerakoll’s structural gel adhesive line — every product tested with the GT method, suitable for porcelain, ceramic, and natural stone. All are suitable for indoor and outdoor use, underfloor heating, terraces, and swimming pools.
H40 tile adhesive line — which one do you need?
Application
Product
Classification
General tiling, large tile, underfloor heating
H40 Gel
GT-2, C2 TE S1
Fast setting, cold weather, water-sensitive natural stone
See the entire H40 range in the tile adhesives category. The system is completed with decorative grouts from Color Fill.
Primers: on gypsum, anhydrite, wood, metal, or PVC substrates, a primer is required before bonding — Active Prime Fix or Active Prime Grip (EP21 for H40 Extreme). Highly absorbent cement substrates can be pre-wetted or primed.
Waterproofing: in wet areas, H40 provides a monolithic, waterproof system with the Kerakoll waterproofing product line.
✓ Regional mineral ≥ 60%
✓ Recycled regional mineral material ≥ 30%
✓ CO2 emissions ≤ 250 g/kg
✓ Low VOC emissions
✓ Recyclable
Entrust the application of Kerakoll gel adhesives to a professional!
Kerakoll’s gel technology adhesives — Biogel and the latest H40 product line — require special mixing and application techniques for perfect adhesion: for underfloor heating, large and thin tiles, critical or existing substrates. Our tiler certified by Kerakoll guarantees structural strength and the validity of the manufacturer’s warranty.
Our service includes:
Free on-site assessment and substrate diagnostics
Adhesive selection advice from the Biogel and H40 range
Professional substrate preparation, even on existing coverings
100% back coverage over the entire tile surface
Manufacturer’s warranty on the workmanship
Why choose us?
Certified Kerakoll tiling specialist
Experience with all substrate types — from porcelain tiles to natural stone
Reference projects in pools, facades, industrial floors
Fixed-price, detailed quotation
Clean, precise work with highly deformable gel adhesives
Request a material + labor package offer! Professional application of Kerakoll gel adhesives guarantees crack-free, durable coverings for decades.
Adhesion strength (28 days): ≥ 2.5 N/mm² — EN 12004-2
Adhesion after heating: ≥ 1 N/mm² — EN 12004-2
Adhesion after underwater storage: ≥ 1 N/mm² — EN 12004-2
Adhesion after freeze-thaw cycle: ≥ 1 N/mm² — EN 12004-2
Adhesion after SAS load cycle: ≥ 1 N/mm² — Kerakoll SAS Technology
Vertical slip: ≤ 0.5 mm — EN 12004-2
Transverse deformation: ≥ 2.5 mm — EN 12004-2
Temperature resistance: -40 °C – +90 °C
VOC emission: EC1 Plus — GEV-EMICODE
GreenBuilding Rating: 4/5 (scale 1-5) — Kerakoll GreenBuilding System
EPD: EPD-IES-0017283 — environdec
Material requirement: ≈ 1.25 kg/m²/mm
Layer thickness: 2–15 mm
Open time: ≥ 60 minutes (+23 °C)
Pot life: ≈ 4 hours (+23 °C)
Walkable: ≈ 24 hours
Groutable on wall: ≈ 12 hours
Ready for use: 2–3 days (mild), 3–7 days (strong)
Pool fillable: ≈ 14 days
Application temperature: +5 °C – +35 °C
Packaging: 25 kg bag, grey or white
Storage: ≈ 12 months, in original bag, dry
Stock and prices
Our webshop is open 24/7. Delivery from Monday to Friday.
Products in stock are delivered within 1–3 days. For products coming from the supplier's warehouse, the delivery time is 1–4 weeks—please consult our customer service before ordering.
All prices include VAT.
Our online store is open 24/7 and ships Monday through Friday, except for some holidays. Orders received for products without delivery restrictions on the product page will be delivered within 1-3 days if received before 12:00 p.m. In the case of orders placed for products in the suppliers' warehouses, the expected availability time is indicated on the product page, and we deliver according to the indicated time.
In order to provide the best service, we try to keep a stock of the most popular products in our warehouse in Budapest. Such products are labeled "In Stock". These can be collected or delivered within 1-3 days.
All other products must be shipped from the supplier's warehouses. This can take 1-4 weeks (it depends on the manufacturer; please confirm the delivery time with our customer service before ordering). Such products are either marked "In Stock" or require a pre-order together with a request for a quote.
All prices include VAT.
Shipping information
DPD/GLS delivery — Throughout Hungary, up to 120 kg. Cost: 2,670–20,830 HUF, based on weight.
Custom delivery — For over 120 kg, please request a quote.
- Full bedding: no hollowing, no cracking
- One bag for everything: gres, ceramic, stone, mosaic, glass
- Wall and floor: the same bag
- Large tile: tested up to 160x320 cm
- For underfloor heating: S1 deformability
- Indoor and outdoor: adheres even under frost and water
- 60 minutes open time: no rushing
- EC1 Plus: low VOC, EPD certified
- Italian engineering design: Kerakoll Sassuolo, since 1968
The official technical guide from Kerakoll for laying porcelain tiles, ceramics, and natural stone — indoor and outdoor layering from cement screed to large slabs, underfloor heating to pools and facades. It shows exactly which products to use and in what order.
In the increasingly important world of sustainable building materials and eco-friendly practices, Kerakoll plays a pioneering role in the industry.
Founded in 1968, the Italian company has become a global leader in the production of adhesives, sealants and other construction materials, while remaining committed to environmental protection.
