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DOWSIL™ 993 Structural Glazing Sealant is a two-component, neutral curing silicone formulation specifically developed for the structural bonding of glass, metal and other building components.


  • Meets European Standard for structural glazing as developed by EOTA working groups.
  • Excellent adhesion to a wide range of substrates including coated, enamelled and reflective glasses, anodized and polyester paint coated aluminium and stainless steel.
  • High level of mechanical properties.
  • Odourless and non-corrosive cure.
  • Excellent stability through a wide temperature range: -50–150ºC.
  • Resistant to ozone.
  • Stable viscosity for A&B components, no heating required.
  • Suitable for use in impact-resistant window systems in new construction and retrofit in existing buildings.


  • Structural capability.
  • The cured product exhibits excellent weathering characteristics and a high resistance to ultra-violet radiation, heat and humidity.
  • Lot matching of base and curing agent not necessary.


DOWSIL™993 Structural Glazing Sealant exhibits a high level of physical properties and adhesive performance which are retained even after aging as detailed by EOTA:

  • 1000 hours exposure to ultra-violet radiation in hot water immersion (ISO DIS 11431).
  • Resistance to salt spray (ISO 9227 NSS).
  • Resistance to SO2 (ISO 3231).
  • Resistance to extreme temperature (ISO 8339, ATG 98/H680 UBAtc).
  • CE Marked (ETA 01/005) as a structural glazing sealant component according to ETAG002, the European Technical Guidelines for structural glazing with a level of attestation of 1, valid in all EC countries (external quality audit).
  • Meets structural glazing sealant requirements according to EN 13022, SNJF VEC & VI-VEC.

Standard product features


- As mixed, at 25°C (77°F) and 50% RH:

  • Colour: Black, non-slump paste.
  • Specific gravity: 1.30.
  • Working time: 10–30 minutes.
  • Tack-free time: 80–100 minutes.
  • Tensile strength: 0.95 MPa.
  • Elongation at break: 130%.
  • Durometer hardness, Shore A: 40 points.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-75/360 Silicone glazing compounds or sealants

Product specification

An important note about specifying



Dow Silicones Belgium SPRL


+32 64 888 000

Product reference

DOWSIL™ 993 Structural Glazing Sealant


[993 Base]
[993 Curing Agent]

Manufacturer details

Parc Industriel - Zone C,
Rue Jules Bordet,
Seneffe, B-7180,
Tel +32 64 888 000
Fax +32 64 888 950
NBS Plus
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