DOWSIL 791 Weatherproof facade sealant

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dowsil 791 silikon pogodowy
dowsil 791 silikon pogodowy
dowsil 791 silikon pogodowy
silikon wdowsil 791
silikon wdowsil 791

Cechy szczególne: Dobra przyczepność do wielu podłoży, Dobra wodoodporność, Klej/uszczelniacz jednoskładnikowy, Utwardzanie Alkoxy (Neutralny))

Niska temperatura: od -31°C do -50°C

Norma: EN 15651

Pojemność opakowania: 310ml

Wysoka temperatura: +151°C do 200°C

Zastosowanie: Szklenie strukturalne i uszczelnianie fasad, Wielozadaniowe

DOWSIL™ 791 Weatherproofing Sealant

A one-component weather-resistant sealant designed to seal structures against weather conditions


The highest quality sealant, waterproof silicone, specially designed
for general glazing and weather sealing

  • curtain walls and facades of brick and stone buildings
  • traditional construction products
  • glazed facades,
  • planar systems and general glazing,

Features and Benefits:

  • excellent performance
  • One component, low modulus, neutral curing silicone
  • It is ideal for extending, connecting and all other types of connections
  • Compatible with all DOWSIL™ structural sealants
  • Excellent weather resistance - resistant to UV radiation
  • high performance over a wide temperature range
  • High movement ability +/- 50%
  • Easy to apply - ready to use, as in the kit
  • Conforms to ISO 11600 F&G-25LM, ISO 9047 Class 50%, ATG, SNJF Vitrage et Façade Category 1, ASTM C-920, DIN 18540

Typical Properties

    • Adhesion to aluminium, anodised aluminium, brick, concrete, enamelled and reflective glass, fluorocarbon coated aluminium, glass, granite, heat strengthened glass, lightweight stone panels, limestone, low-e coated glass, marble, masonry, metal, metal panels, paint, plastic , polyester powder coating aluminium/steel, silicone, stainless steel, steel, stone, vinyl/PVC-U, wood
    • Appearance (Colours) Opaque, wide range of colors ( anthracite, white, brown, black, metal-steel grey, metal-grey, grey, limestone, colorless)
    • Durometer - Shore A 25-30
    • Movement Ability -50 to 50%
    • Flow/Sag (Drop): 0mm
    • Non-porous substrate
    • Shelf life 12 months
    • specific gravity 1.50 at 25°C
    • 120 psi tensile strength


    Test Property Unit Value
    Binding system alkoxy
    application temperature
    °C +5 to +40
    Temperature resistance °C -50 +150
    CTM1 97B Density 1.5
    CTM 364C Juicing speed g/minute 220
    CTM 98B Skin formation time (23°C, 50% RH) minutes 20
    CTM 95A Time to dust dry (23°C, 50% RH) minutes thirty
    CTM 663A Setting time (23°C, 50% RH) 1 day
    mm 2
    Three days mm 4
    2 mm thick S2 dumb-bells (ISO2 37/DIN3 53 504)
    CTM 137 A Modulus at 100% elongation MPa 0.45
    CTM 137 A Tensile strength MPa 1.9
    CTM 137 A Lengthen, not at break % 700
    Technically approved joint 12x12x50 mm structural joint TA (ISO 8339/DIN 2-8339)
    CTM 677 Modulus at 100% elongation MPa 0.35
    CTM 677 Tensile strength MPa 0.75
    CTM 677 Lengthen, not at break % 380
    CTM 99E Hardness measured with a hardness tester Shore A 29
    ISO 7389 Post-deformation recovery % > 90
    ISO 9047 Movement ability % ±50

    Specifications and Standards

    • Conforms to SNJF
    • ISO 11600-F&G-25LM
    • DIN 18540 Class F
    • EN 15651 - CE MARK

    Benefits of the application

      • Primerless Adhesion: Primerless

    Processing and formulation benefits

      • Curing system One-piece neutral curing
      • Curing at room temperature - days 7 to 14 days
      • Dry time (50% RH) 45 minutes
      • Working time 20 minutes

    Durability and Storage

    When stored at or below 30°C (86°F) in the original, unopened containers, this product has: a shelf life of 12 months from the date of manufacture.


    DOWSIL™ 791 Silicone Weatherproofing Sealant is supplied in 310 ml cartridges and
    600 ml of so-called "sausages"

    How to use

    Substrate preparation

    Make sure that the surfaces to be sealed are clean, dry, sound and degreased. Clean non-porous surfaces with DOWSIL™ R-40 Universal Cleaner and dry thoroughly with a clean, lint-free cloth before applying the sealer.
    Porous substrates such as concrete, brick, mortar, etc. should be mechanically cleaned of loose particles using a steel brush, grinding wheel or other similar means.

    Primers are not required but may be useful for some specific substrates


    Areas adjacent to joints must be masked with tape to prevent contamination of substrates and to ensure a neat sealing line. Masking tape should be removed immediately after processing.

    Curing time

    The joint should be machined within 5 minutes of application to ensure good contact between the sealant and the substrate. The sealant treatment also gives a smooth, professional finish.

    Connector design

    When designing joints using DOWSIL™ 791 Silicone Weathering Sealant, the minimum width should be 6 mm. For joints wider than 12 mm, a width to depth ratio of 2:1 should be used. In situations where fillet welds are required, a minimum of 6mm of sealant per substrate is recommended. For joint dimensions greater than 25 mm wide or greater than 15 mm deep, please contact your regional service center for technical assistance.

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