BOSS ® 389 Weather Seal Silicone Sealant
 BOSS ® 389 Weather Seal Silicone Sealant is an one part neutral cure, medium modulus, lowodor, construction grade sealant that offers excellent adhesion, weatherability and compatibility with wide variety of materials. BOSS ® 389 is ideally suited for weather proofing, waterproofing, sealing, expansion & control joints and general purpose glazing.
BOSS ® 389 has excellent adhesion to glass, glazed surfaces, galvanized steel, anodized aluminum, concrete, cement, wood, ceramics, painted surface and many plastics.
BOSS ® 389 weather seal silicone sealant fully meets or exceeds the requirements of the following specifications:
- ASTM C920-86,
- TT-S-001543A and
- TT-S-00230C.
FEATURES:
- One Part , no mixing required
- Easy to apply
- Excellent adhesion to most common building materials
- Low Odor
- Non-Corrosive to metal
- Permanently Flexible
- Weatherproofs / Waterproofs
- UV resistant
TYPICAL PROPERTIES |
| |
| Uncured |
| Specific Gravity |
|
1.40 |
| Colors |
|
Black, Grey and White |
| Sag/Slump |
|
NIL |
| Tack-Free Time |
|
> 90min |
| Cure Time at 75°F (24°C) and 50% RH (3/8” thickness) |
|
24 hours |
| Full Cure time |
|
7- 10 days |
| Tooling time |
|
25-30 min |
| Extrusion Rate |
|
275 g/min |
|
| Cured – Physical |
|
| Elongation |
|
375% |
| Durometer Hardness, Shore A, points |
|
25 |
| Tensile Strength, psi |
|
195 |
| Dynamic Movement Capability
Cycled at 1/8’’ hr.,1/8min.% |
|
± 30 |
|
"Product Range"
|
