AppliedProduct selection and comparison are drawn from the owner-authorized Coating Additives Handbook. Verify current TDS/SDS and performance in the intended formulation before use.
Technical challenge
An oxidatively drying coating can form an unwanted skin in the container yet still needs normal film formation after application.
Product selection
Candidates are organized by a supplied technical handbook and the individual published TDS where available. These are starting points for trials, not confirmed equivalents or universal dosage recommendations. Grades without a SITI TDS page are not treated as formally published product profiles.
| Grade / evidence | Relevant system | Selection considerations |
|---|---|---|
| SiSiB PB2002Handbook grade; TDS page unavailable · handbook slide 124Products category ↗ | Oxidatively drying alkyds and selected related coatings | Handbook MIBKO-based anti-skinning example; assess in-can protection and post-application dry, then review current SDS/TDS. |
MEKO-free anti-skinning product record
The table reproduces product-selection directions from the owner-authorized handbook. Listed grades are screening candidates, not interchangeable products or a claim that every grade has a published SITI TDS. Confirm current documentation and the complete formulation.
| Product / chemistry | Handbook specification | Application and check |
|---|---|---|
| SiSiB PB2002 / methyl isobutyl ketoxime (MIBKO) | CAS 105-44-2; clear liquid; purity min. 99.0%; molecular weight 115.17 | For oxidatively drying alkyds and selected related coatings. Check current SDS/TDS, in-can skin protection and film drying in the actual formulation. |
Handbook slides 124
One oxidation process at two stages
Air-drying alkyds contain unsaturated groups that react with oxygen. Metal driers facilitate the radical reactions that produce a crosslinked film after application. The same chemistry can begin at the liquid–air surface during storage and form an unwanted skin in a partly filled can. The problem depends on oxygen exposure, formulation, drier package and storage conditions.
Temporary inhibition and subsequent drying
An anti-skinning additive is intended to suppress premature surface oxidation during storage while allowing normal drying after the coating is spread as a thin film. Oxime-based options are one approach described in the handbook. A change from a conventional oxime to a different anti-skinning system should be assessed for both in-can protection and the dry-time, hardness and appearance of the applied film. A 'MEKO-free' description by itself does not establish lower hazard, regulatory compliance or equivalent coating performance.
Evaluate the complete formulation
Test the actual package, headspace, storage temperature and time, then assess application and oxidative dry under representative conditions. Review the current safety data, regional requirements and the grade-specific TDS before selecting a material. This chapter explains formulation principles and does not publish a new product specification or regulatory classification.
Formulation guidance
- Compare in-can skin formation under representative storage conditions.
- Check dry time and final film after any anti-skinning change.
- Verify current SDS and applicable requirements for the chosen chemistry.
Troubleshooting
- Skin forms during storage
- Compare headspace, packaging seal, drier package and storage conditions before changing anti-skinning chemistry.
- Post-application drying slows
- Test the actual film thickness and drier package; review current SDS and TDS before selecting a replacement.