Gilsonite in Paints: FAQ
What colour does gilsonite give?
Black in thick films, brown in thin films.
Which solvents dissolve it?
Aromatic solvents, many aliphatics, and hot oils.
Can it be used in water-based paint?
Yes, through emulsions.
Does it improve corrosion resistance?
It improves barrier properties as part of a complete system.
Which grade should I use?
Low-ash paint grade or micronized grade.
Will gilsonite paints bleed through topcoats?
Bituminous materials can bleed into light-coloured topcoats. Use a barrier coat or aluminium paint first.
How durable are gilsonite coatings outdoors?
They protect well but can chalk under strong UV; use topcoats for appearance.
What dosage is typical?
From 10 % to over 50 % of binder solids depending on the product.
Can I add gilsonite to an existing paint?
Only after compatibility testing; it is best introduced as a pre-dissolved varnish.
Which grade?
Low-ash, highly soluble paint grade or micronized gilsonite.
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Ink & Paint Grade Gilsonite
| Property | Typical value | Test method |
|---|---|---|
| Appearance | Dark brown–black powder | Visual |
| Softening point (R&B) | 150 – 180 °C | ASTM D36 |
| Ash content, max | 3 % | ASTM D3174 |
| Moisture, max | 1 % | ASTM D95 |
| Solubility in toluene, min | 99 % | ASTM D2042 |
| Particle size | 200 – 600 mesh | Sieve |
| Typical dosage | Ink varnish: 20–40 % in oil | |
| Packing | 25 kg paper bags with PE liner, palletized. | |
Typical values. The final specification is confirmed in the COA of each shipment.
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