Formulation Basics for Gilsonite Pipe Coating Compounds
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Components
- Bitumen (oxidized or penetration grade)
- Gilsonite (5–25%)
- Mineral filler (talc, slate, limestone)
- Optional polymers
Process
Heat bitumen, add gilsonite and dissolve, then add filler with mixing.
Targets
Softening point, penetration and sag resistance per specification.
Example enamel formulation
| Component | Typical range | Purpose |
|---|---|---|
| Oxidized bitumen | 60–75 % | Binder |
| Gilsonite | 5–15 % | Hardness, softening point |
| Mineral filler | 20–30 % | Reinforcement, sag control |
Process tips
- Dissolve gilsonite fully before adding filler.
- Control temperature to avoid excessive ageing.
- Check sag and penetration on each batch.
Testing
Softening point, penetration, filler content, sag, flexibility and impact at low temperature.
Recommended product
Data sheet
Coating & Waterproofing Grade Gilsonite
| Property | Typical value | Test method |
|---|---|---|
| Appearance | Black powder | Visual |
| Softening point (R&B) | 150 – 200 °C | ASTM D36 |
| Ash content, max | 5 % | ASTM D3174 |
| Moisture, max | 1 % | ASTM D95 |
| Solubility in TCE, min | 97 % | ASTM D2042 |
| Particle size | ≤ 200 mesh | Sieve |
| Typical dosage | 5 – 25 % of compound | |
| Packing | 25 kg bags palletized; 1 MT jumbo bags. | |
Typical values. The final specification is confirmed in the COA of each shipment.
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