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DOWSIL 993 Structural Glazing Sealant

Two-part silicone sealant for structural glazing applications.

DOWSIL 993 Structural Glazing Sealant is a two-component silicone rubber designed for structural glazing applications. It offers excellent adhesion to various substrates while providing high mechanical properties and stability across a wide temperature range. This neutral curing sealant maintains its performance under extreme conditions, ensuring durability and reliability in building components.
With a non-corrosive, odorless cure, it provides extensive weathering resistance, making it suitable for diverse architectural uses.

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Technical Details

DOWSIL 993 Structural Glazing Sealant is suitable for a wide range of applications in construction and architecture:
  • Structural glazing systems
  • Bonding glass to metal frames
  • Insulating glass units
  • Facades and curtain wall applications
  • Weatherproofing building joints
  • Applications requiring high strength and durability
DOWSIL 993 Structural Glazing Sealant presents numerous advantages that enhance its effectiveness and application versatility in structural glazing projects:
  • Meets European standard for structural glazing, ensuring compliance with rigorous quality standards.
  • Excellent adhesion to a variety of substrates, including coated, enamelled, reflective glasses, and metals.
  • High mechanical properties that contribute to its structural capability.
  • Odorless and non-corrosive cure, promoting a safe workplace environment.
  • Wide service temperature range from -50°C to +150°C, suitable for diverse climatic conditions.
  • Exceptional weathering resistance, including high resistance to ultra-violet radiation, heat, and humidity.
  • Lot matching of base and curing agent is not necessary, simplifying the application process.
DOWSIL 993 Structural Glazing Sealant offers comprehensive technical information that underscores its reliability and performance in structural applications:
Test Property Unit Result
Base: as supplied Color and consistency Viscous white paste
Specific gravity 1.36
Viscosity (100sª¹) mPa.s 150,000
Curing agent: as supplied Color and consistency Viscous black paste
Specific gravity 1.08
Viscosity (100sª¹) mPa.s 15,000
Flash point – closed cup °C 28
Flash point – closed cup °F 82.4
Flash point – open cup °C 84
Flash point – open cup °F 183.2
As mixed Color and consistency Black non-slump paste
Specific gravity 1.33
Viscosity (100sª¹) mPa.s 40,000
Working time (25°C/77°F, 50% RH) minutes 10 to 30
Tack-free time (25°C/77°F, 50% RH) minutes 80 to 100
Corrosiveness Non-corrosive
As cured – after 7 days at 25°C (77°F) and 50% RH Tensile strength MPa 0.95
Tear strength kN/m 6.0
Elongation at break % 130
Durometer hardness, Shore A 40
Sealant dynamic design load Pa 140,000
Sealant static design load Pa 15,000
Service temperature range °C -50 to +150
Service temperature range °F -58 to +302
DOWSIL 993 Structural Glazing Sealant is designed for various structural bonding applications, ensuring strength and durability in construction projects. The following outlines its key applications:
Structural Glazing Systems:
Ideal for use in structural glazing systems, providing reliable adhesion between glass and framing materials.
Bonding Glass to Metal Frames:
Effective for securely bonding glass panels to metal frames, enhancing the integrity of the overall structure.
Insulating Glass Units:
Suitable for fabricating insulating glass units, offering superior thermal performance and energy efficiency.
Facades and Curtain Walls:
Applicable in facades and curtain wall constructions, contributing to aesthetic appeal and weather resistance.
Weatherproofing Building Joints:
Serves as a reliable sealant for weatherproofing building joints, preventing water ingress and air leaks.
High Strength and Durability Applications:
Designed for applications that require high strength and durability, ensuring longevity and performance under extreme conditions.
DOWSIL 993 Structural Glazing Sealant is available in the following packaging:
DOWSIL 993 Structural Glazing Sealant Base is available in 226.8 kg drums.
DOWSIL 993 Structural Glazing Sealant Curing Agent is available in 19 kg pails.
For warranty information regarding DOWSIL 993 Structural Glazing Sealant, please contact our team at SMCC. We are here to assist you with any inquiries and provide further details regarding the warranty terms and conditions. Feel free to reach out using any of the contact methods available on this page.

Product FAQ

DOWSIL 993 can effectively bond coated, enamelled, and reflective glasses, anodised and polyester paint coated aluminum, as well as stainless steel.
DOWSIL 993 Structural Glazing Sealant can operate within a temperature range of -50°C to +150°C (-58°F to +302°F).
The curing time for DOWSIL 993 is approximately 7 days at 25°C (77°F) and 50% relative humidity to achieve full properties, with initial handling possible within 2 hours.
The working time for DOWSIL 993 is between 10 to 30 minutes.
The sealant’s tear strength is 6.0 kN/m.
The service temperature range for DOWSIL 993 is -50°C to +150°C.

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DOWSIL 993 Structural Glazing Sealant