Bituminous Caulks and Mastics with Gilsonite
Caulks and mastics seal joints in roofs, gutters, foundations and tanks.
Gilsonite’s contribution
- Body and hardness
- Adhesion
- Water resistance
Formulation
Bitumen, gilsonite, fillers, fibres and solvent.
Common applications
- Roof flashings and gutters
- Around pipes and vents on roofs
- Foundation joints
- Tanks and metal structures
Typical composition
| Component | Purpose |
|---|---|
| Bitumen | Main binder |
| Gilsonite | Hardness, heat resistance |
| Mineral filler | Body, reduced shrinkage |
| Fibres | Prevent slumping |
| Solvent | Workability |
Application tips
Apply to clean, dry surfaces, tool firmly into joints and avoid thick sections that dry slowly. In hot climates, gilsonite helps prevent the mastic from sliding on vertical surfaces.
Packaging
Mastics are sold in cartridges, pails and drums depending on the job size.
Recommended product
Sealer & Filler Grade Gilsonite
| Property | Typical value | Test method |
|---|---|---|
| Appearance | Black powder | Visual |
| Softening point (R&B) | 150 – 180 °C | ASTM D36 |
| Ash content, max | 5 % | ASTM D3174 |
| Moisture, max | 1 % | ASTM D95 |
| Solubility in toluene, min | 98 % | ASTM D2042 |
| Particle size | ≤ 200 mesh | Sieve |
| Typical dosage | Sealer: 15 – 35 % | |
| Packing | 25 kg bags palletized. | |
Typical values. The final specification is confirmed in the COA of each shipment.
Related articles
Slurry Seals and Micro-Surfacing with Gilsonite
Slurry seals and micro-surfacing combine emulsion, fine aggregate and filler. Can be incorporated into the asphalt before emulsification…
Gilsonite Pavement Sealer: A Complete Guide
Gilsonite-based pavement sealers are used to protect and renew asphalt surfaces such as parking lots, driveways and airport…
Gilsonite in Cold Patch and Pothole Repair Mixes
Cold patch mixes repair potholes quickly without hot asphalt. Improves cohesion and stiffness after curing, helping patches stay…