Cobalt, manganese, zirconium, calcium, and rare earth driers each play specific roles in controlling surface dry, through-dry, and hardness development of alkyd coatings — widely used in protective maintenance paints, decorative oil-based paints, and industrial alkyd coatings across UAE and Saudi Arabia.
Technical specifications
| PARAMETER | SPECIFICATION |
|---|---|
| Cobalt Octoate (surface drier) | CAS 136-52-7 — 6% Co active — fast surface dry |
| Manganese Octoate (through drier) | CAS 6160-87-8 — 6% Mn — through-dry, colour development |
| Zirconium Octoate (hardness drier) | CAS 22464-99-9 — 6% Zr — hardness, adhesion |
| Calcium Octoate (auxiliary drier) | CAS 136-51-6 — wetting, cobalt synergist |
| Rare Earth Drier (cobalt-free) | Ce/La complex — lower toxicity alternative to Co |
| Active Metal Content | 6 – 18% (varies by metal type) |
| Appearance | Blue-violet (Co), amber (Mn), clear (Zr, Ca) liquids |
| Solvent | White spirit, naphtha, or mineral spirits |
| Typical Addition (Co) | 0.03–0.06% Co metal on alkyd weight |
| Packing | 25 kg / 200 kg drums |
| HS Code | 3212.90 |
Applications
- Alkyd Protective Maintenance Paints — Cobalt + zirconium drier combination is standard in alkyd anti-corrosion maintenance paints for structural steel across UAE and Saudi Arabia industrial facilities — provides fast surface dry for recoat scheduling and good through-dry for early handling strength.
- Decorative Gloss Alkyd Paints — Cobalt + calcium drier combination in high-gloss alkyd architectural paints — cobalt provides fast tack-free time critical for dust-free drying in UAE's dusty environments, calcium improves wetting and synergises with cobalt.
- Industrial Alkyd Coatings — Primers & Topcoats — Complete drier package (Co + Mn + Zr + Ca) optimised for industrial maintenance alkyd primer and topcoat systems on steel structures, storage tanks, and equipment in UAE and Saudi Arabia industrial facilities.
- Wood Finishes & Furniture Coatings — Manganese + zirconium drier combination in alkyd and oil-modified varnishes for wood furniture and joinery in UAE and Saudi Arabia indoor applications — deeper penetration and better through-hardness than cobalt alone.
- Printing Inks (Oxidative Drying) — Cobalt and manganese driers used in sheet-fed offset printing inks for the UAE and Saudi Arabia print industry — accelerates oxidative drying of linseed or soya oil vehicle systems.
Key properties
- Cobalt: fastest surface dry — primary drier in most alkyd systems
- Manganese: strong through-dry — reduces wrinkling tendency
- Zirconium: improved hardness, adhesion, and durability
- Calcium: synergist — improves cobalt efficiency and substrate wetting
- Rare earth (Ce/La): cobalt-free alternative — lower hazard classification
- Liquid form — easy homogeneous mixing into alkyd formulations
- Compatible with all standard alkyd grades (short, medium, long oil)
- Effective in both solvent-based and reactive diluent systems
Usage and recommendations
Standard alkyd drier package: Co 0.04% + Zr 0.08% + Ca 0.10% (as metal on alkyd solids). Adjust Co level based on oil length of alkyd — longer oil alkyds require slightly more Co. In UAE summer conditions, elevated ambient temperature accelerates drying — lower drier loading in summer formulations prevents over-oxidation and embrittlement. Cobalt driers are under regulatory review in EU (SVHC status under REACH) — for export markets, consider rare earth or manganese-heavy cobalt-free alternatives. Never exceed recommended drier levels — overdosing causes wrinkling, embrittlement, and reduced long-term film durability.
Packaging
- 25 kg PE Jerry Cans
- 200 kg Steel Drums
- IBC on request
Storage and shelf life
Store in sealed containers at 5–35°C, away from oxidising materials and ignition sources (flammable liquid — white spirit base). Shelf life: 24 months. Protect cobalt driers from light — UV degrades cobalt activity.