KEDA · S500

S500 Stone & Concrete Silicone Sealant

Joint Sealing for Stone and Concrete Details

KEDA S500 is intended for non-structural connection and perimeter joints involving stone and concrete. Its purpose is joint sealing, not the bonding, anchoring or repair of stone components.

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Product Values

Stone & Concrete

Non-Structural Joints

Elastic Sealing

Custom Formulation

Technical Parameters

Product technical parameters
Product Model	S500
Composition	One-component silicone polymer-based sealant
Curing Mechanism	Neutral moisture cure
Appearance	Non-sag paste
Density	0.95–1.05 g/mL (ISO 1183-1)
Skin Formation Time	≤20 min at 23°C / 50% RH
Cure Rate	≥2 mm / 24 h at 23°C / 50% RH
Shore A Hardness	20–30 after full cure (ISO 868)
Tensile Strength	≥1.0 MPa (ISO 37)
Elongation at Break	≥400% (ISO 37)
Movement Capability	±25% (ISO 9047)
Application Temperature	+5°C to +40°C
Service Temperature	−40°C to +150°C

Application & Packaging

Application Areas

Non-structural joints between stone finish elements.
Connections between stone and adjoining concrete or masonry.
Perimeter joints where stone finishes meet compatible frames or other building components.
Non-structural connection joints in concrete details.

Suitable Substrates

Stone, concrete and adjoining materials after adhesion and staining evaluation.

Packaging

Pack format: Cartridge
Carton quantity: Order-specific
Custom options: Fill volume, colour and private label packaging
Fill volume: Specified for the order

Usage Instructions

Confirm the joint design. Identify the joint's purpose, width, depth and expected movement. Match the design to verified sealant capability; do not use the sealant to compensate for loose panels or failed fixings.
Prepare the surfaces. Remove failed sealant, dust, loose cement residue and other contamination. Bonding surfaces must be sound, clean and dry. Check surface treatments and use cleaning methods approved for the stone and surrounding materials.
Prepare the backing. Use compatible backing material or bond-breaker tape as specified by the joint design so the sealant can move as intended.
Mask and prime where specified. Protect sensitive finishes with suitable masking tape. Use a primer only when approved for the selected sealant and substrate; a primer suitable for concrete is not automatically suitable for natural stone.
Fill and finish the joint. Apply a continuous bead with contact along both joint sides. Tool before skin formation and remove masking tape while the material remains workable. Do not introduce unapproved finishing liquids onto the stone.
Protect during curing. Keep the joint free from disturbance, contamination and premature exposure. Follow the supplied instructions for application conditions and the required curing period.

FAQ & Limitations

Is S500 the same as marble adhesive or epoxy stone adhesive?

No. S500 is positioned for non-structural joint sealing. Stone repair, slab bonding and cladding attachment require an appropriate adhesive or fixing system selected for those tasks.

Is S500 guaranteed not to stain marble or granite?

A blanket guarantee is not made here. Staining performance needs to be established for the selected product and the actual stone, finish and joint materials before use.

Does concrete always need a primer?

Primer selection depends on the sealant, substrate condition and exposure. Provide details of concrete age, moisture condition and any curing compound or coating. Follow the confirmed preparation instructions rather than selecting a primer solely because it is labelled for concrete.

Can I choose a colour to match the stone?

Send the desired shade and, where possible, a reference sample. Any available colour and packaging option must be confirmed before ordering. A screen image or packaging illustration is not a reliable colour standard.

KEDA PRODUCT ENQUIRY

Discuss Your Stone and Concrete Joint Requirements

Share your materials, application, performance requirements, preferred packaging and expected quantity. KEDA can propose a suitable product configuration for S500 Stone & Concrete Silicone Sealant.

KEDA S500 Stone & Concrete Silicone Sealant