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Sika Flex Polyurethane Sealant
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Sika Flex Polyurethane Sealant is a high-performance, elastic, one-component polyurethane-based sealant designed for sealing and bonding applications in construction, automotive, and industrial sectors. It offers excellent adhesion to a wide range of substrates including concrete, metal, wood, and plastics without the need for primers. The sealant provides durable, weather-resistant, and flexible joints, capable of absorbing movement and vibrations, making it ideal for expansion joints, facade sealing, and structural glazing.
Description
Sika Flex Polyurethane Sealant
Primary Uses
- Construction Industry
- Sealing expansion and construction joints in buildings, bridges, and infrastructure.
- Bonding and sealing facade elements such as panels, windows, and curtain walls.
- Weatherproofing and waterproofing joints exposed to UV radiation and harsh environmental conditions.
- Floor joint sealing to accommodate thermal and mechanical movements.
- Automotive Industry
- Sealing and bonding automotive components such as windshields, body panels, and trim.
- Vibration dampening and noise reduction in vehicle assemblies.
- Industrial Applications
- Sealing joints in machinery and equipment subject to dynamic stress and movement.
- Used in prefabricated elements bonding and sealing.
Secondary Uses
- Marine and Transportation
- Sealing of joints in ships, railcars, and other transport vehicles exposed to water and weather.
- DIY and Home Repair
- General purpose sealing and bonding in residential repairs and renovations.
- Restoration Projects
- Suitable for restoration and conservation where flexible, durable sealing is required.
KEY PRODUCT FEATURES
1. Basic Identification Attributes
- Chemical Name (IUPAC): Polyurethane prepolymer with additives
- Common/Trade Name: Sika Flex Polyurethane Sealant
- CAS Number: Mixture (varies by formulation)
- HS Code: 3910.00 (Silicone and polyurethane sealants)
- Synonyms: PU sealant, elastic polyurethane sealant
2. Physical & Chemical Properties
- Physical State: Paste
- Color & Odor: Available in multiple colors; mild characteristic odor
- Density: Approx. 1.3 – 1.5 g/cm³
- Solubility: Insoluble in water; cures by moisture reaction
3. Safety & Hazard Attributes
- GHS Classification: May cause skin and eye irritation; respiratory sensitizer in some formulations
- Toxicity: Low when cured; avoid inhalation and skin contact during application
- Exposure Limits: Follow occupational safety guidelines for isocyanates and solvents
4. Storage & Handling Attributes
- Storage Conditions: Store in tightly sealed cartridges or pails in a cool, dry place away from direct sunlight and heat sources
- Container Type: Cartridges, sausages, or pails (varied sizes)
- Shelf Life: 12 months from manufacture if unopened and properly stored
- Handling Precautions: Use gloves, goggles, and ensure adequate ventilation during application
5. Regulatory & Compliance Attributes
- Complies with ASTM C920, ISO 11600 standards for sealants and joint fillers
- Meets VOC regulations for construction sealants in the US EPA and EU directives
- Manufactured in compliance with REACH and OSHA standards for worker safety and environmental protection
- Supports LEED certification with low-emission formulation
- Conforms to local building codes and fire safety regulations
6. Environmental & Health Impact
- Biodegradability: Not biodegradable due to polymer nature
- Ecotoxicity: Low; avoid environmental release of uncured product
- Bioaccumulation: Not significant
SAFETY HANDLING PRECAUTIONS
Safety Handling Precautions
- PPE Required: Gloves, safety goggles, protective clothing recommended
- Handling Guidelines: Use in well-ventilated areas; avoid inhalation of vapors and skin contact
- Storage Measures: Keep containers tightly closed; store away from ignition sources and incompatible materials
First Aid Measures
- Inhalation: Move to fresh air immediately; seek medical attention if respiratory symptoms develop
- Skin Contact: Wash thoroughly with soap and water; seek medical advice if irritation persists
- Eye Contact: Rinse eyes with plenty of water for at least 15 minutes; seek urgent medical care
- Ingestion: Rinse mouth; do not induce vomiting; seek immediate medical attention
Firefighting Measures
- Fire Hazards: Combustible when uncured; emits toxic fumes when burning
- Extinguishing Media: Foam, dry chemical, CO₂, water spray
- Special Precautions: Use self-contained breathing apparatus and protective gear
- Hazardous Combustion Products: Carbon oxides, nitrogen oxides, isocyanate fragments
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