DOWSIL 995
Harmonization Code : 8001.20 | Unwrought tin: Tin alloys
Main features
- 350 psi Ultimate Tensile Strength
- +/-50% Structural Joint Movement
- 10-20-Minute Structural Glazing Window
Product Description
DOWSIL 995 Silicone Structural Sealant supports structural bonding of glass and metal and protective glazing with a one-part, neutral-cure silicone formulation. The ready-to-use material provides a 10-20 minute working time, 65-minute tack-free time and seven- to fourteen-day cure at 25 deg C and 50% relative humidity. After seven days, it reaches Shore A 40 hardness, 350 psi ultimate tensile strength and 525% elongation. Structural-glazing installations require project-specific joint design, substrate testing, quality controls and specific Dow approval; the product data do not replace system-level engineering validation.
Key features
- High ultimate tensile strength: Typical seven-day ultimate tensile strength is 350 psi.
- 10-20 minute working time: Supports placement and tooling before surface cure.
- +/- 50% joint movement: ASTM C719 movement capability applies after 21 days of cure.
Applications
Structural bonding of glass and metal and protective glazing within project-specific Dow design and approval controls.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Mechanical Properties
Additional Information
As-supplied / before-processing properties
Typical as-supplied and cure-development properties. Values are not specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Color | Black, gray or white | As supplied | |
| Tack-free time | 65 | min | ASTM C679; 50% RH |
| Curing time | 7-14 | days | At 25 deg C and 50% RH |
| Full adhesion | 14-21 | days | Typical value |
| Flow, sag or slump | 0.1 | in | ASTM C639 |
| Working time | 10-20 | min | Typical value |
| Specific gravity | 1.339 | As supplied | |
| VOC content | 30 | g/L | SCAQMD basis |
After-processing / final-state properties
Typical cured properties at 25 deg C and 50% relative humidity. Seven-day and 21-day values are identified separately.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Durometer hardness | 40 | Shore A | After seven days; ASTM D2240 |
| Ultimate tensile strength | 350 (2.41) | psi (MPa) | After seven days; ASTM D412 |
| Ultimate elongation | 525 | % | After seven days |
| Tear strength, Die B | 49 | ppi | After seven days; ASTM D624 |
| Peel strength | 40 | ppi | After seven days; ASTM C794 |
| Tensile at 25% elongation | 43 (0.30) | psi (MPa) | After 21 days; ASTM C1135 |
| Tensile at 50% elongation | 65 (0.43) | psi (MPa) | After 21 days; ASTM C1135 |
| Joint movement capability | +/- 50 | % | After 21 days; ASTM C719 |
