Würth
Würth Cerafix 505 Joint Mortar
Würth Cerafix 505 Joint Mortar
Key Features
- Universal joint mortar suitable for natural stone and ceramic coverings (joint widths 2-25mm).
- Flexible, ductile and water-repellent, providing smooth, dense joints with high edge adhesion.
- Weather- and frost-resistant, suitable for critical indoor and outdoor applications.
- Resistant to water and alternating freeze/thaw cycles - ideal for balconies, terraces, facades, and swimming pools.
- Low dust formulation for a cleaner working environment.
- Resealable bucket for easier transport and storage, even when opened.
- Smooth application with minimal force required, ensuring higher daily output.
- Low efflorescence tendency and easy-to-clean, water-insoluble joints.
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Description
Professional Joint Mortar for Stone and Ceramic Surfaces
Würth Cerafix 505 is a flexible and ductile cement-based joint mortar designed for use with both absorbent and non-absorbent ceramic and natural stone coverings. It is ideal for filling joints in fine earthenware, stoneware, porcelain tiles, brick tiles, and natural stone surfaces across a wide range of environments - from residential bathrooms to demanding industrial facilities.
Indoor and Outdoor Applications
With its resistance to weathering, moisture, freeze/thaw cycles, and heavy loads, Cerafix 505 can be confidently used on balconies, terraces, facades, swimmind pools, and underfloor heating systems. Its water- and dirt-repellent formulation ensures that finished joints remain smooth, easy to clean, and highly durable.
Efficient and Easy Processing
The mortar has a smooth, malleable consistency, requiring minimal effort to apply. It provides excellent edge adhesion and elutriation, helping to achieve a uniform joint finish with minimal wastage. With reduced dust levels and resealable packaging, it is a clean and practical solution for both small repairs and large-scale tiling projects.
Quality and Standards
Würth Cerafix 505 meets classification CG 2 WA standards, ensuring improved abrasion resistance and reduced water absorption for long-lasting results.
Technical Information
Specifications
Chemical Basis: Cement with classified sand
Colour: Anthracite
Container: 5 kg resealable bucket
Mixing Ratio: 1.25–1.5 L water per 5 kg mortar
Working Life: Max. 3 hours
Walkable After: ~7 hours (20 °C / 65% RH)
Full Resilience: 48 hours (20 °C / 65% RH)
Processing Temperature: +5 °C to +30 °C
Compressive Strength: ≥ 21 N/mm²
Flexural Strength: ≤ 4.5 N/mm²
Consumption (3 mm joint width): 0.4–0.6 kg/m²
Shelf Life: 18 months (stored cool and dry, protected from humidity)
Documents
Application Instructions
- Joints must be clean, dry, and free from mortar, adhesives, or separating substances.
- Absorbent substrates should be evenly moistened before filling.
- Mix 5kg of Cerafix 505 with 1.25-1.5L of clean water in a clean bucket using a paint stirrer.
- Allow the mix to mature for 5 minutes, then stir thoroughly again.
- Always maintain the same mixing ratio to avoid colour differences.
- Apply the mortar diagonally using a rubber filler, squeegee, or tile jointing float until the joints are fully filled.
- Clean surplus mortar with a moist sponge or sponge float, working diagonally or horizontally to avoid washing out joints.
- Replace dirty water regularly to achieve a clean joint pattern.
- Protect new joints from direct sunlight, high temperatures, wind, frost, and rain during curing.
Consumption (Guide Values)
- 0.4-0.6 kg/m^2 for 3mm joint width.
- 0.8-1.2 kg/m^2 for 5mm joint width.
- 2.0-2.5 kg/m^2 for 8mm joint width.
- 3.5-4.0 kg/m^2 for 12mm joint width.
- 9.0-10.0 kg/m^2 for 25mm joint width.
Usage Notes
- Do not add water or fresh mortar to mixes that have already started to harden.
- For polished porcelain stoneware and some natural stone, colour pigments may settle into micropores - test grouting is recommended.
- Avoid using dy cloths for cleaning, as dried grout particles may cause discolouration when rubbed into moist joints.