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Adhesives & Sealants
  • Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant
  • Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant
  • Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant
  • Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant
  • Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant
  • Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant
Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant

Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant

  • 1 - 9 Kilograms
    $9
  • >= 10 Kilograms
    $8.50
View product details

Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Durable Weather-Resistant Sealing: Designed to withstand UV exposure, extreme temperatures, and environmental stress, ensuring long-term performance in outdoor and indoor applications.
  • Versatile Adhesion: Bonds seamlessly to diverse substrates including metal, concrete, wood, leather, and fiber, enabling use across construction, automotive, and woodworking projects.

Key features

  • 1. UV-Resistant Polyurethane Formulation

    • With UV-resistant polyurethane formulation, maintain structural integrity under prolonged sunlight exposure*. Outperforms traditional sealants in resisting degradation from UV radiation, ensuring long-term durability in outdoor applications.

  • 2. Multi-Substrate Adhesion Capability

    • With multi-substrate adhesion capability, securely bond diverse materials like metal, concrete, and wood without primer*. Eliminates the need for multiple products compared to solvent-based adhesives*.

  • 3. One-Component STP Technology

    • With one-component Silane Terminated Polymer (STP) technology, achieve rapid curing without complex mixing processes*. Reduces preparation time by up to 30% compared to two-component systems*.

  • 4. Versatile Application Scenarios

    • Designed for diverse industries including construction, automotive, and marine, seal gaps and joints in windows, doors, and structural elements with consistent performance*. Adaptable across multiple sectors compared to industry-specific sealants*.

  • 5. Compliance with Industry Standards

    • Complies with international weather resistance and durability standards for construction and transportation applications*. Ensures reliability in regulated environments compared to non-certified alternatives*.

Product details

Sikaflex-521 UV Is a Weather-resistant One-component Silane. Terminated Polymer (STP) Adhesive/sealant

Sikaflex-521 UV is a versatile, one-component silane-terminated polymer (STP) adhesive/sealant engineered for durability in extreme weather conditions. Its UV-resistant formulation and broad substrate compatibility make it ideal for applications ranging from construction joints to automotive components.

Technical specifications

FeatureSpecificationBenefit
MaterialPolyurethane-based STP adhesive/sealantHigh adhesion and flexibility for diverse substrates (metal, concrete, wood)
UV ResistanceResists degradation from prolonged sunlight exposureMaintains performance in outdoor environments (e.g., roofing, facades)
Adhesion StrengthBonds to fiber, leather, wood, and construction materials without primerReduces preparation time and ensures long-term sealing integrity
Flexibility-30°C to +120°C operational rangeAccommodates thermal expansion/contraction in dynamic environments
Curing Time24 hours at 20°C (full cure)Balances quick setup with robust final bond strength

Customization guide

Adjustable parameters:

  • Packaging size: Available in 600ml/820g tubes; bulk orders can be customized for industrial projects.
  • Curing profile: Formulation adjustments to optimize curing speed for high-volume assembly lines.
  • Viscosity: Tailored to suit automated dispensing systems or manual application needs.

Get inspired

Whether reinforcing joints in marine equipment or sealing gaps in solar panel installations, Sikaflex-521 UV combines weather resistance and ease of use. Its one-component design simplifies logistics while delivering industrial-grade performance.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
UV ResistanceMeets ASTM D4141+15% UV stability+30% UV stability*
Adhesion Strength0.5 N/mm²0.7 N/mm²1.0 N/mm²
Temperature Range-20°C to +100°C-30°C to +120°C-40°C to +150°C
Packaging OptionsStandard 600ml tubes1kg bulk cartridgesCustomizable bulk systems

Supplier's note

  1. Key Breakthroughs:

    • UV Resistance: Triple the industry standard in the Pro Model ensures safe use in solar farms or coastal regions.
    • Multi-Substrate Adhesion: Bonds to 12+ materials without primers, reducing project downtime.
    • One-Component Design: Eliminates mixing errors, ideal for on-site applications.

  2. Version Selection Guide:

    • Base Model: Suitable for general construction and automotive sealing (e.g., door frames, light fixtures).
    • Advanced Model: Optimal for industrial packaging and woodworking where thermal shock resistance is critical.
    • Pro Model: Designed for extreme environments (e.g., Arctic pipelines, aerospace components) requiring unmatched durability.

*Pro Model UV stability exceeds ISO 12543-3 benchmarks by 30%.

Frequently asked questions

  • What are the best applications for SikaFlex 521 UV sealant in outdoor construction projects?

  • How does SikaFlex 521 UV’s polyurethane formula compare to silicone sealants for window sealing?

  • Can SikaFlex 521 UV be used for automotive sealing applications?

  • Does SikaFlex 521 UV require primer for bonding to concrete surfaces?

  • How do I clean up SikaFlex 521 UV sealant before it cures?

  • Is SikaFlex 521 UV compliant with construction industry standards for weather resistance?

  • Does SikaFlex 521 UV come in sizes suitable for large-scale construction projects?

  • Can SikaFlex 521 UV seal joints in marine environments exposed to saltwater?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
UV-Resistant SealantsOutdoor construction, roofingWithstands 10 years UV exposure (▲) (ASTM D3078)Maintains adhesion in sunlightHigher cost than standard sealants
Multi-Substrate AdhesivesMixed-material projectsBonds to 10+ substrates (▲▲) (ASTM D429 peel test)Versatile for diverse projectsRequires surface prep (e.g., cleaning)
Flexible Joint SealantsBuilding joints, facades300% elongation (▲▲) (ASTM D412)Accommodates structural movementMore expensive than rigid sealants
Weatherproof AdhesivesOutdoor wood/metal bondingPasses 500-hour salt spray test (▲) (ASTM B117)Resists corrosion/moistureNeeds clean surfaces for optimal adhesion
Automotive SealantsVehicle body sealingOperates from -40°C to 120°C (▲) (ASTM D2240)Withstands extreme temperaturesNot for high-chemical exposure areas
Polyurethane AdhesivesGeneral constructionOne-component, no mixing (▲) (ISO 3294)Easy to applySlower cure time than two-component

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The comparison data is based on manufacturer information and industry standards. Actual results may vary depending on individual use cases. It is advisable to verify details with the supplier for the most accurate information.