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KEDA KD997 Neutral Silicone Stone Sealant

KEDA KD997 Neutral Silicone Stone Sealant

KD997 is a single-component, neutral cure, room temperature vulcanizing (RTV) silicone sealant specifically formulated for natural and artificial stone applications. It provides excellent adhesion to most stone materials without causing staining or discoloration. With exceptional weather resistance and temperature performance ranging from -40°C to 150°C, it maintains excellent bonding properties and prevents cracking over the long term, making it the ideal choice for premium stone installations.

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  • Single-component System: Neutral cure at room temperature, ready to use
  • Stone-Specific Adhesion: Excellent bonding to various marble, granite, limestone, sandstone, and other building stones
  • Non-Staining Formula: Does NOT cause contamination, discoloration, or oil staining on stone surfaces – a critical feature for high-end stone work
  • Superior Flexibility: Excellent elastic elongation properties to accommodate stone movement
  • Wide Temperature Range: Maintains performance from -40°C to 150°C without cracking
  • Long-Lasting Durability: Outstanding resistance to weathering, UV radiation, and aging
  • Neutral Cure: Non-corrosive to stone, metal, and other building materials
Applocation
  • Joint sealing for dry-hung stone curtain wall projects
  • Joint sealing for ceramic and porcelain tile installations
  • Joint sealing between stone and other materials such as glass and metal panels
  • Natural stone facade sealing (marble, granite, limestone, travertine, etc.)
  • Interior stone wall and floor applications
  • Monument and sculpture restoration
  • High-end architectural stone projects
  • Various other stone sealing applications
Package
  • Cartridge Size: 590ml
  • Available Colors:Clear/Transparent, White, Stone Gray, Beige (custom colors available for large orders)
  • Packaging Type: Sausage pack/cartridge
  • Shelf Life: 12 months from production date (in sealed original container)
  • Storage Conditions: Store in cool, dry place below 27°C

Step 1: Surface Preparation (CRITICAL for stone applications)

  • Ensure stone surfaces are completely clean, dry, and free from dust, dirt, oil, grease, wax, sealers, and loose particles
  • For porous stones (marble, limestone, travertine), ensure surfaces are sufficiently dry – moisture can cause adhesion failure
  • Remove any previous sealants or coatings
  • IMPORTANT: Do NOT use oily or solvent-based cleaners that may contaminate the stone
  • Use only water or approved stone cleaners, then allow to dry completely

Step 2: Pre-Application Testing (HIGHLY RECOMMENDED)

  • Always conduct a small test application on an inconspicuous area of the actual stone
  • Check for staining, discoloration, or adhesion issues after 24-48 hours
  • Test is especially important for porous or light-colored stones
  • Verify compatibility with any stone sealers or treatments

Step 3: Joint Design

  • Use appropriate backer rod or bond breaker tape for joints deeper than 12mm
  • Recommended joint width-to-depth ratio: 2:1 for optimal performance
  • Ensure three-sided adhesion is avoided to prevent joint failure
  • For stone-to-stone joints, maintain consistent joint width

Step 4: Application

  • Cut the cartridge nozzle at a 45° angle to desired bead size
  • Load cartridge into a standard caulking gun
  • Apply sealant evenly and continuously into the joint
  • Ensure complete joint filling without air pockets or gaps
  • Work in small sections to maintain quality

Step 5: Tooling & Finishing

  • Tool the sealant surface within 10-15 minutes of application before skin formation
  • Use a spatula or smoothing tool moistened with soapy water (DO NOT use solvents)
  • Immediately clean any excess sealant from stone surfaces before it cures
  • Remove masking tape immediately after tooling

Step 6: Curing & Protection

  • Allow adequate curing time: typically 7-21 days for full cure depending on joint depth and conditions
  • Protect joints from rain, moisture, and contamination during initial 24-48 hours
  • Avoid stress, traffic, or movement during cure period
  • Keep work area clean to prevent contamination of stone

Additional information

Product Type

Single-component neutral silicone stone sealant

Special Feature

Non-staining formula

Cure System

Moisture cure (neutral)

Skin Formation Time

10-20 minutes (23°C, 50% RH)

Tack-Free Time

20-30 minutes (23°C, 50% RH)

Curing Speed

3-5 mm/24 hours

Application Temperature

+5°C to +40°C

Service Temperature

-40°C to +150°C

Movement Capability

±25%

Hardness (Shore A)

20-35

Tensile Strength

≥0.6 MPa

Elongation at Break

≥350%

Staining Test

No staining on marble, granite, and porous stone

Limitation
  • NOT for structural glazing or load-bearing applications
  • NOT suitable for materials that exude oils, plasticizers, or solvents
  • NOT recommended for poorly ventilated or confined spaces
  • NOT suitable for surfaces in direct contact with food or potable water
  • NOT recommended for continuous water immersion or permanently submerged applications
  • NOT suitable for aquarium or pool sealing
  • DO NOT apply when substrate temperature is below +4°C or above +50°C
  • NOT paintable (silicone does not accept paint or coatings)
  • NOT recommended for oily stones (some tropical hardwoods contain oils)
Tips

CRITICAL – Stone-Specific Guidelines:

Pre-Installation:

  • ALWAYS test on actual stone samples first – different stone types react differently
  • For white marble, Carrara, and other light-colored porous stones, testing is MANDATORY
  • Consult stone supplier about any pre-applied sealers or treatments
  • Check moisture content of stone before application (especially important for natural stone)

Stone Types – Special Considerations:

  • Marble & Limestone (porous): Extra care needed, must be completely dry, test for staining
  • Granite (dense): Generally good adhesion, minimal staining risk
  • Travertine (very porous): May require special surface preparation
  • Sandstone (porous): Test thoroughly, may show darker appearance around joints
  • Polished surfaces: Clean thoroughly to remove polishing compounds
  • Honed/Flamed surfaces: May absorb sealant differently than polished

For Best Results:

  • Clean excess sealant from stone IMMEDIATELY before it skins over
  • Use masking tape to protect stone surfaces and ensure clean lines
  • Work in moderate temperatures (15-25°C ideal) for best flow and cure
  • Avoid application in direct sunlight on dark stone (surface too hot)
  • For large projects, maintain consistent application technique across all joints

Color Matching:

  • Clear/Transparent: Best for translucent stones, colored glass
  • White: For white marble, limestone, light-colored stones
  • Stone Gray: For gray granite, concrete, metal panels
  • Beige: For beige marble, travertine, sandstone
  • Custom colors available for large projects (consult factory)

Quality Assurance:

  • Inspect all joints for complete fill and proper tooling
  • Check for any sealant residue on stone surfaces – clean immediately
  • Monitor first few installations closely for any staining issues
  • Document all testing and installation procedures

Maintenance:

  • Advise owners that silicone joints cannot be painted or stained
  • Joint color may vary slightly from stone color
  • Regular cleaning with pH-neutral cleaners is recommended
  • Inspect joints annually for any degradation or damage

Storage & Handling:

  • Store cartridges upright in cool, dry conditions
  • Rotate stock using FIFO principle
  • Once opened, use within one month for optimal performance
  • Protect from freezing and excessive heat

Environmental Considerations:

  • Ensure adequate ventilation during application and cure
  • Dispose of empty cartridges according to local regulations
  • Clean tools with mineral spirits; cured sealant removes mechanically