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Medium-oil-length alkyd resin based on phthalic anhydride and soybean oil fatty acids.
Designed for high-gloss, durable air-drying coatings with excellent flow and leveling.
Offers balanced drying performance—good through-dry combined with surface dry control.
Compatible with common hydrocarbon solvents and conventional alkyd crosslinkers.
Delivers superior hardness development and resistance to yellowing in clear and pigmented systems.
General-purpose industrial maintenance coatings.
Wood finishing systems including furniture, cabinets, and interior trim.
Can coatings for non-food-contact metal packaging.
Automotive refinish primers and topcoats (non-OEM).
Architectural wood and metal coatings for exterior and interior use.
| Chemical Type | Medium-oil modified alkyd resin |
| Product Form | Liquid |
| Appearance | Clear to slightly hazy, pale yellow liquid |
| Solvent | Xylene / aromatic hydrocarbon blend |
| Non-Volatile Content (wt%) | ~75 ± 1% |
| Viscosity (25°C, mPa·s) | 800–1,200 |
| Acid Value (mg KOH/g) | 6–9 |
| Density (25°C, g/cm³) | 0.98–1.02 |
Q1: What is the primary application area for SETAL 321 SM-75?
A: SETAL 321 SM-75 is a solvent-based short-oil alkyd resin specifically designed for high-performance industrial maintenance and protective coatings, including metal primers, topcoats, and general-purpose enamel systems where good gloss retention, through-dry, and substrate adhesion are required.
Q2: Is SETAL 321 SM-75 compatible with common crosslinkers used in industrial coatings?
A: Yes — it is fully compatible with conventional amino resins (e.g., melamine-formaldehyde) and can be effectively co-baked in thermosetting systems. It also exhibits good compatibility with other alkyds, acrylics, and certain polyurethane modifiers when formulating hybrid binder systems.
Q3: How does SETAL 321 SM-75 perform in terms of drying behavior and film formation?
A: As a short-oil alkyd, it offers relatively fast air-dry characteristics with good through-dry and film hardness development. Its formulation flexibility allows adjustment of surface dry time and final cure profile depending on solvent blend, catalyst selection, and baking conditions.
Q4: Can SETAL 321 SM-75 be used in low-VOC formulations?
A: While inherently solvent-based, it can contribute to VOC-reduced systems when blended with high-solids alkyds or reactive diluents, and is suitable for formulations targeting regional VOC limits — though final compliance depends on the full formulation and application method.
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