Understanding Ceramic Tile Adhesives and EN 12004 – A Global Performance Standard

From C1 to C2TE S1 Systems – Formulation Strategies, Product Compliance & Chemion's Full Support

What Are Ceramic Tile Adhesives (CTA)?

Ceramic tile adhesives (CTAs) are cementitious mortars used to fix ceramic, porcelain, or natural stone tiles to floors and walls. Unlike traditional cement-sand mortars, modern CTAs are dry-mix formulations enhanced with polymers and additives to meet application performance and regulatory requirements.

They offer:
- Greater bonding strength
- Extended working and open times
- Flexibility and crack bridging
- Compatibility with diverse substrates
- Low dust, improved slip control, easy application

What Is EN 12004?

EN 12004 is the European standard defining the performance requirements for cementitious, dispersion-based and reactive adhesives used for fixing ceramic tiles. It includes performance classes based on adhesion strength, slip, open time, and flexibility.

Main Classes under EN 12004

- C1: ≥ 0.5 MPa adhesion (dry, wet, heat, freeze-thaw)
- C2: ≥ 1.0 MPa adhesion under same conditions
- T: ≤ 0.5 mm slip (vertical surfaces)
- E: ≥ 0.5 MPa after 30 min open time
- S1/S2: Deformable adhesive ≥ 2.5 mm (S1) or ≥ 5 mm (S2)

How Are EN 12004 Properties Tested?

- Initial adhesion: EN 1348
- Open time: EN 1346
- Slip: EN 1308
- Thermal cycling: EN 1348
- Deformability: EN 12002

Formulation Philosophy: C1 vs. C2TE S1

Chemion provides guidelines based on global dry mix practices that balance performance with cost optimization.

Typical Raw Material Ranges

C1 System (%):
- Cement: 30–35
- Filler: 65–70
- Cellulose Ether: 0.2–0.4
- RDP: 0.5–1.5
- Calcium Formate: Optional 0.3–0.5

C2TE S1 System (%):
- Cement: 35–45
- Filler: 50–60
- Cellulose Ether: 0.4–0.6
- RDP: 2.0–6.0
- Calcium Formate: 0.5–0.8

Chemion AG: Full Raw Material Support for CTA Producers

Cellulose Ethers (HPMC / MHPC)

- Fast hydration, no surface treatment
- Viscosity 20k to 80k cps
- High water retention
- Better slip control and smooth trowel feel
Recommended Grades: HPB 25 DX, HPB 30 DX, HPB 50 DX

Redispersible Polymer Powders (RDP)

- VAE and VAE-acrylic copolymers
- High tensile and flexural strength
- Deformability and bonding
- Anti-caking and anti-skin options
Recommended Grades: RDP 30 D, RDP 55 D, RDP 65 D

Additives & Specialty Solutions

- Calcium Formate: Cement accelerator
- Dispersants / PCEs: Better water demand
- Defoamers: Reduce air entrapment
- Fibers: Enhance sag resistance and crack control

Chemion's Global Advantage

- Swiss HQ + China production
- Technical support for CTA benchmarking
- EN 12004 compliant materials
- Logistic coverage in Europe, MENA, South America
- Internal testing based on EN methods

Chemion Sample Services

- Formulation guidance with local cement/filler
- Testing protocols and benchmarking
- Sample kits: HPB + RDP + Additives
- Private label and OEM packaging

Contact Us

Email: info@chemionag.com
Website: www.chemionag.com

CHEMION AG – Making Every Tile Bond Count.