Cobalt Drier for Offset Ink (Cobalt Octoate)
CAS Number: 61789-52-4
Cobalt octoate is the standard primary surface-active siccative for oxidatively drying sheetfed offset and letterpress inks, supplied as a 6% or 12% cobalt-metal solution in aliphatic hydrocarbon. It accelerates the peroxide-initiated crosslinking of linseed, tung, and soy-alkyd vehicles at the ink film surface, dramatically reducing tack-free time. Used at 0.02–0.10% Co on total ink weight, always in a drier package with Mn and Zr co-driers.
Technical Specifications
| solvent | Aliphatic hydrocarbons (white spirit) |
| appearance | Dark violet to purple liquid |
| flash point (°C) | ≥61 |
| density (g/mL, 25 °C) | 0.95–1.05 |
| cobalt metal content (%) | 6.0 or 12.0 |
Applications
- Primary surface drier in sheetfed offset inks
- Letterpress and relief printing ink drying packages
- Alkyd overprint varnish oxidative drying catalyst
- Metal decorating and can-coating ink driers
- Drying-oil-modified varnish accelerators
Key Features
- Fastest surface-drying response among all metallic driers
- Available in 6% and 12% Co concentrations for dosing flexibility
- Compatible with all linseed oil, tung oil, and alkyd ink vehicles
- Synergistic with Mn, Zr, and Ca co-driers for balanced through-cure
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CAS Number
61789-52-4
Category
Printing Ink ChemicalsAvailability
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