Home > Companies > Dow Silicones Belgium SPRL > DOWSIL™ 756 SMS Building Sealant

Sealant designed for weathersealing natural stone facades, curtain walling and expansion joints in structural glazing.


  • Cures to form a unique, dry matt finish surface.
  • Improved aesthetic performance; reduces long-term residue rundown on glass, metal panels or staining on porous substrates.
  • Good working and tooling time.
  • All-temperature gunnability: from -29–50°C, permitting application in all seasons.
  • Low modulus, high movement capability; can accommodate ±50% movement in a properly designed joint.
  • Unprimed adhesion to most glass, brick and fluoropolymer-painted substrates; primed adhesion to other common construction substrates such as marble, limestone, granite and concrete.
  • Excellent weatherability; non-reverting silicone durability.
  • Compatible with open and closed-cell polyurethane backer rods.
  • Paintable; may be painted with oil based paints after full cure and up to six months after installation.


  • For weatherproofing sensitive porous stone, curtain walling, metal panels and in structurally glazed façades.
  • Expansion joints.


  • Conforms to ISO 11600 F&G 25LM and DIN 18545 E.

Standard product features


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

  • Flow, sag or slump: 2.54 mm.
  • Working time: 30 minutes.
  • Tack-free time: 120 minutes.
  • Curing time: 7–14 days.

- As cured after 7 days at 25°C (77°F) and 50% RH:

  • Tensile strength: 1.4 MPa.
  • Tensile adhesion, ultimate: 0.6 MPa.
  • Elongation at break: 1200%.
  • Durometer hardness, shore A: 30 points.
  • Tensile strength at 100% elongation: 0.48 MPa.



Custom colours are also available – contact manufacturer for details.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-75/315 Construction joint sealants

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Dow Silicones Belgium SPRL


+32 64 888 000

Product reference

DOWSIL™ 756 SMS Building Sealant



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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