NBS Source


Suitable for structural bonding and protective glazing applications.


  • Install back-up material or joint filler, setting blocks, spacer shims, and tapes. Mask areas adjacent to joints to ensure neat sealant lines.
  • Apply Dowsil 995 Silicone Structural Sealant in a continuous operation using a positive pressure.
  • Before a skin forms (typically within 10 minutes), tool the sealant with light pressure to spread the sealant against the backing material and joint surfaces.


Dowsil 995 Silicone Structural Sealant is a one-component neutral-curing silicone sealant designed specifically for structural bonding applications of glass and metal in factory or field situations.

The rate of surface cure and cure-in- depth of most one-component RTV silicone sealants is affected by the temperature and humidity of the environment. However, an environment of high temperatures in combination with high humidity may slow the surface cure rate of

Dowsil 995 Silicone Structural Sealant.

Features and benefits:

  • Odourless, non-corrosive cure system.
  • Cures to form an extremely tough elastomeric rubber ensuring a durable, flexible, watertight bond.
  • Excellent weatherability and high resistance to ultraviolet radiation, heat and humidity, ozone and temperature extremes.
  • Excellent mechanical properties.
  • Successfully tested for use in protective glazing applications.
  • Excellent un-primed adhesion to wide range of substrates including. coated, enamelled, and reflective glasses; anodized and polyester coated or painted aluminium profiles including most fluoropolymer based paints such as Kynar
  • Meets global standards for structural glazing (American, Chinese, European).


Clean all joints and glazing pockets, removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings.

General information










Pr_30_31_76_78 Silicone glazing compounds and sealantsPrimary


H13/115 Structural glass assembly

Specification data - Silicone glazing compounds and sealants Enhanced data

Third party certification

SNJF VEC, SGBP 2017-1251.


Neutral cure.





Tensile strength (MPa)

2.41 MPa.

As cured after seven days at 25°C and 50% RH.

Specific gravity

As supplied.


Tear strength

As cured after seven days at 25°C and 50% RH.

49 ppi.

Elongation at break

As cured after seven days at 25°C and 50% RH.


VOC content

As supplied.

30 g/L.

Hardness (shore A)

As cured after seven days at 25°C and 50% RH.

40 points.


As supplied.

Full adhesion: 14–21 days.


As supplied.

0.1 inches.

Joint movement

As cured after 21 days at 25°C and 50% RH.

± 50%.

Shelf life

18 months.

When stored at or below 30°C in the original unopened containers, this product has a usable life of 18 months from the date of manufacture.

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