Polysulfide Sealants
Polysulfide sealants are advanced elastomeric compounds widely used in construction and industrial applications for their exceptional durability and flexibility. These high-performance sealants create reliable waterproof barriers and can withstand extreme environmental conditions.
Key Features of Polysulfide Sealants
- Excellent resistance to fuels, oils, and solvents
- Superior adhesion to various substrates including concrete, metal, and glass
- Wide operating temperature range (-60°F to 250°F/-51°C to 121°C)
- High elongation capacity (up to 500%)
- Long service life of 20+ years
Technical Specifications
| Property | Value | Test Method |
|---|---|---|
| Shore A Hardness | 30-50 | ASTM D2240 |
| Tensile Strength | 2.0-3.5 MPa | ASTM D412 |
| Elongation at Break | 300-500% | ASTM D412 |
| Service Temperature | -51°C to +121°C | ASTM C719 |
| Water Absorption | <5% | ASTM D570 |
Polysulfide Sealants FAQ
Q: What makes Polysulfide Sealants different from silicone or polyurethane sealants?
A: Polysulfide Sealants offer superior chemical resistance, particularly against fuels and solvents, which makes them ideal for specialized industrial applications. Unlike silicone, they provide excellent adhesion without primers on most surfaces, and unlike polyurethane, they maintain flexibility at extremely low temperatures.
Q: How long does it take for Polysulfide Sealants to cure completely?
A: The curing time for Polysulfide Sealants depends on temperature and humidity conditions. Typically, skin forms in 4-8 hours at room temperature (70°F/21°C), with full cure achieved in 7-10 days. Thicker applications may require longer curing periods.
Application Guidelines
- Surface Preparation: Clean and dry all surfaces thoroughly
- Application Temperature: 40°F to 100°F (4°C to 38°C)
- Tooling: Smooth joints within 20 minutes of application
- Cleanup: Use mineral spirits before sealant cures
Polysulfide Sealants FAQ
Q: Can Polysulfide Sealants be painted over?
A: Yes, most Polysulfide Sealants can be painted over once fully cured (typically after 7-10 days). However, we recommend testing paint compatibility on a small area first. Some formulations may require specific types of paint for optimal adhesion.
Safety Information
| Safety Parameter | Details |
|---|---|
| Flash Point | >100°C (212°F) |
| VOC Content | <250 g/L |
| Skin Contact | Wear gloves and protective clothing |
| Eye Protection | Safety goggles recommended |
Polysulfide Sealants FAQ
Q: What is the shelf life of Polysulfide Sealants?
A: Unopened containers of Polysulfide Sealants typically have a shelf life of 12 months when stored in their original packaging at temperatures between 50°F and 80°F (10°C to 27°C). Once opened, the material should be used within 6 months for optimal performance.
Common Applications
- Airfield and runway joints
- Marine applications (hull sealing, deck joints)
- Fuel storage tanks and pipelines
- Swimming pools and water treatment facilities
- Structural glazing in construction