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.
A one-component, self-priming, shelf-stable, neutral-cure, elastomeric adhesive specifically formulated for silicone structural glazing and exhibits excellent unprimed adhesion to most building substrates. This product has superior unprimed adhesion for structural glazing applications for hurricane or impact rated windows and doors. It has a movement capability of +/- 50%.
High ultimate tensile strength sealant ideally suited for structural bonding and protective glazing applications
Features & Benefits:
Odorless, 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 unprimed adhesion to wide range of substrates including coated, enameled, and reflective glasses; anodized and polyester coated or painted aluminum profiles including most fluoropolymer-based paints such as Kynar
Meets global standards for structural glazing (American, Chinese, European)
One-part, neutral-cure elastomeric sealant
Adhesion to - Alodine Aluminum, Aluminum, Anodized Aluminum, Enamelled and Reflective Glass, Extruded Mill Finish, Fluorocarbon Coated Aluminum, Glass, Heat Strengthened Glass, Low E Coated Glass, Metal, Metal Panels, Polyester Powder Coated Aluminum/Steel, Stainless Steel, Steel, Vinyl/PVC-U
Appearance - Opaque
Chemistry - Neutral
Color - Black, Grey, White
Cure System : 1-Part Cure
Cure Type - Neutral Cure
Durometer - Shore A : 40 Shore A
Elongation - 525 %
Flow - NonSag
Flow/Sag (Slump) - 2.54 mm
Movement - Medium
Movement Capability : -50 to 50 %
Peel Strength - 40 ppi
Resistance Type - Ozone Resistance, Thermal Resistance, UV Resistance, Water Resistance
Room Temperature Cure - Hours : 168 to 336 Hours
Shelf Life - 540 Days
Specific Gravity @ 25°C - 1.339
Substrate - Non-porous
Tack-Free Time-50% RH - 65 Minutes
Tear Strength - 49 ppi
Tensile Strength - 350 psi
Volatile Organic Content - 30 g/liter
Water Resistant - Yes
Where Used - Job Site
Working Time - 10 to 20 Minutes
Tack-Free Time, 50% RH - 65 minutes
Curing Time 25°C (77°F) at 50% RH : 7-14 days
Full Adhesion - 14-21 days
Flow, Sag, or Slump - 0.1 Inches
Working Time - 10-20 minutes
Specific Gravity - 1.339
Volatile Organic Content (VOC) - 30 g/L
As Cured - After 7 Days at 25°C (77°F), 50% RH:
Durometer Hardness, Shore A - 40 Points
Ultimate Tensile Strength - 350 (2.41) Psi (MPa)
Ultimate Elongation - 525%
Tear Strength, Die B - 49 ppi
Peel Strength - 40 ppi
As Cured - After 21 Days at 25°C (77°F), 50% RH -
Tensile at 25% Elongation - 43 (0.30) psi (MPa)
Tensile at 50% Elongation - 65 (0.43) psi (MPa)
Ultimate Tensile Strength - 170 (1.17) psi (MPa)
Joint Movement Capability - ± 50 %
Silicone structural glazing and protective glazing applications
Approvals / Specifications:
DOWSIL 995 Silicone Structural Sealant has been internally tested and is designed to meet or exceed the test requirements of:
Federal Specification TT-S- 001543A (COM-NBS) Class A for silicone building sealant
Federal Specification TT-S-00230C (COM-NBS) Class A for one-component building sealant
ASTM Specification C-920 Type S, Grade NS, Class50, Use NT, G and A
ASTM C1184 Standard Specification for Structural Silicone Sealant
Chinese specification GB 16776 for structural glazing
DOWSIL 995 Silicone Structural Sealant exhibits a high level of physical properties and adhesive performance, which are retained even after aging as detailed by EOTA ETAG 002 and prEN 13022 European Standards.
How to Use:
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.
Install back-up material or joint filler, setting blocks, spacer shims, and tapes. Mask areas adjacent to joints to ensure neat sealant lines. Primer is generally not required on non-porous surfaces, but may be necessary for optimal sealing of certain porous surfaces. A test placement is always recommended.
Apply DOWSIL 995 Silicone Structural Sealant in a continuous operation using a positive pressure. (The sealant can be applied using many types of air-operated guns and most types of bulk dispensing equipment.) 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. Remove masking tape as soon as the bead is tooled.
Before handling, read product and safety data sheets and container labels for safe use, physical and health hazard information.
DOWSIL 995 Silicone Structural Sealant should not be applied:
To building materials that bleed oils, plasticizers, or solvents- materials such as impregnated wood, oil-based caulks, green or partially vulcanized rubber gaskets or tapes
In totally confined spaces as the sealant requires atmospheric moisture for cure
When surface temperatures exceed 60°C (140°F)
Where painting of the sealant is required, as the paint film may crack and peel
To surfaces in contact with food- this sealant does not comply with Federal Food and Drug Administration food-additive regulations
In below-grade applications
For use as an interior penetration fire stop sealing system
In horizontal floor joints where abrasion and physical abuse are likely to be encountered
To frost-laden or damp surfaces
For continuous immersion in water
This product is neither tested nor represented as suitable for medical or pharmaceutical uses.
Usable Life And Storage:
When stored at or below 30°C (86°F) in the original unopened containers, this product has a usable life of 18 months from the date of manufacture.
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