KEDA KD996 Neutral Silicone Weatherproofing Sealant

KD996 is a single-component, neutral cure, room temperature vulcanizing (RTV) silicone sealant with medium-high modulus and high movement capability. Specially designed for weatherproofing and joint sealing in various curtain wall applications, it offers exceptional weather resistance, anti-aging properties, and outstanding performance in extreme temperature conditions.

Single-component System: Neutral cure at room temperature, easy to apply
Superior Mechanical Properties: Excellent elasticity, elongation, and tensile strength for demanding applications
Exceptional Weather Resistance: Outstanding resistance to climatic conditions, UV radiation, and temperature extremes
Universal Adhesion: Excellent bonding to most building materials without primer in most cases
Medium-High Modulus: Provides structural stability while maintaining flexibility
High Movement Capability: Accommodates joint movement up to ±25%

Applocation

Weather sealing for various glass curtain wall systems
Weather sealing for metal aluminum panels and ceramic curtain walls
Joint sealing for skylight and roofing constructions
Facade perimeter sealing applications
Expansion and control joints in commercial buildings
Various other multipurpose weatherproofing applications

Package

Cartridge Size: 300ml, 590ml
Available Colors: Clear/Transparent, White, Black, Gray, Customized
Packaging Type: Hard tube, 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

Ensure all substrates are clean, dry, and free from contamination, dust, oil, grease, and loose particles
For porous substrates, ensure they are sufficiently dry
Remove any old sealant, paint, or coatings that may interfere with adhesion

Step 2: Joint Design

Use appropriate backer rod or bond breaker tape for joints deeper than 12mm
Recommended joint width-to-depth ratio: 2:1
Ensure three-sided adhesion is avoided

Step 3: Application

Cut the cartridge nozzle at a 45° angle to desired bead size
Load cartridge into a professional caulking gun or power applicator
Apply sealant evenly and continuously into the joint
Ensure complete joint filling without air pockets

Step 4: 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
Remove masking tape immediately after tooling if used

Step 5: Curing

Allow adequate curing time: typically 7-21 days for full cure depending on joint depth
Protect from rain and moisture during initial 24 hours
Avoid stress or movement during cure period

Additional information

Product Type	Single-component neutral silicone sealant
Modulus	Medium-high
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	-50°C to +150°C
Movement Capability	±25%
Hardness (Shore A)	25-40
Tensile Strength	≥0.8 MPa
Elongation at Break	≥400%
Tensile Modulus at 100%	0.4-0.6 MPa

Limitation

NOT for structural glazing applications (use Thor KD999 structural sealant instead)
NOT suitable for materials that exude oils, plasticizers, or solvents (e.g., certain woods, rubbers)
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 compatible with surfaces that bleed oils (teak, redwood)
DO NOT apply when substrate temperature is below +4°C or above +50°C
NOT paintable (silicone does not accept paint or coatings)
NOT compatible with bituminous surfaces or materials containing copper

Tips

For Best Results:

Conduct adhesion tests on actual substrates before full-scale application, especially for critical projects
Use appropriate primer if specified after adhesion testing
Maintain consistent bead thickness and width throughout application
For optimum performance, joint depth should not exceed 12mm
In cold weather, store sealant at room temperature before use
Clean uncured sealant immediately with mineral spirits; cured sealant can only be removed mechanically
For professional curtain wall applications, follow relevant building codes and standards

Size Selection Guide:

590ml: Best for large-scale commercial projects, curtain wall installations, professional contractors
300ml: Ideal for residential projects, repairs, maintenance work, and small-scale applications

Quality Assurance:

Perform regular visual inspections during application
Check for proper adhesion, continuous bead, and absence of air pockets
Verify proper tooling and surface finish
Document installation conditions (temperature, humidity) for project records

Environmental Considerations:

Ensure adequate ventilation during application and curing
Dispose of empty cartridges according to local regulations
Avoid release into water systems or soil

Storage & Handling:

Keep cartridges upright during storage
Rotate stock using FIFO (First In, First Out) principle
Once opened, use within one month for optimal performance
Do not expose to freezing temperatures