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Highly reactive melamine-formaldehyde resin offering excellent cure speed at low baking temperatures.
Outstanding compatibility with acrylic, polyester, and alkyd resins in solventborne coating systems.
Delivers superior hardness, gloss retention, and chemical resistance in thermoset coatings.
Low free formaldehyde content, supporting safer handling and regulatory compliance (e.g., REACH).
Good storage stability when formulated with appropriate acid catalysts and solvents.
Automotive OEM and refinish topcoats requiring high durability and appearance.
Industrial coil coatings for metal roofing, siding, and appliance panels.
General-purpose can coatings for food and beverage containers.
Electrical insulation varnishes for motor and transformer windings.
Wood furniture and cabinet finishes demanding fast line speeds and mar resistance.
| Chemical Type | Melamine-formaldehyde crosslinker |
| Product Form | Liquid |
| Appearance | Clear to slightly hazy, water-white to pale yellow liquid |
| Solvent Content | Approx. 65–70% (isobutanol/butanol blend) |
| Non-Volatile Content | 30–35% (by weight, 105°C, 30 min) |
| Viscosity (25°C) | 80–150 mPa·s (Brookfield LV, spindle #3, 60 rpm) |
| pH (10% solution in water) | 7.5–9.0 |
| Key Features | Low-cure, high-gloss, formaldehyde-controlled, broad resin compatibility |
Q1: What is the primary function of CYMEL 303 in coating formulations?
A: CYMEL 303 functions as a highly reactive melamine-formaldehyde crosslinker, designed to enhance hardness, chemical resistance, and thermal stability in thermosetting coatings—particularly when used with hydroxyl- or carboxyl-functional acrylic, polyester, or alkyd resins.
Q2: How does CYMEL 303 differ from other melamine crosslinkers in terms of cure profile?
A: CYMEL 303 offers a balanced reactivity—faster than high-methylolated melamines but more controllable than highly reactive low-methylol types—enabling good pot life at ambient temperatures and efficient curing at typical industrial baking conditions (e.g., 140–160 °C).
Q3: Is CYMEL 303 compatible with acid-catalyzed systems?
A: Yes—CYMEL 303 is commonly used with strong or weak organic acid catalysts (e.g., p-toluenesulfonic acid or blocked sulfonic acids) to accelerate cure. Catalyst selection and dosage should be optimized to balance storage stability and film formation performance.
Q4: Can CYMEL 303 be used in low-VOC or waterborne coatings?
A: Yes—CYMEL 303 is fully compatible with many water-reducible and solvent-borne systems. Its low free formaldehyde content and solubility in common polar solvents support formulation flexibility for VOC-compliant applications, though final compliance depends on the full formulation and processing conditions.
Q5: What are key handling and storage recommendations for CYMEL 303?
A: Store in tightly sealed containers at temperatures between 10–30 °C, away from moisture, strong oxidizers, and alkaline materials. Prolonged exposure to humidity or elevated temperatures may lead to premature condensation; always follow good industrial hygiene practices during handling.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
