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High reactivity with epoxy resins enabling fast cure at low temperatures (160–180 °C).
Excellent storage stability in powder blends—no premature gelation or viscosity increase.
Delivers superior mechanical properties including high gloss, impact resistance, and flexibility.
Low volatile organic compound (VOC) content—fully compliant with strict environmental regulations.
Consistent batch-to-batch performance supported by Covestro’s rigorous quality control system.
Automotive components including wheels, brackets, and under-hood parts.
Architectural aluminum profiles for windows, façades, and curtain walls.
Industrial appliances such as washing machines, ovens, and HVAC enclosures.
Outdoor furniture and garden equipment requiring weather-resistant finishes.
Office furniture frames and metal shelving systems.
| Chemical Type | Modified dicyandiamide (DICY)-based curing agent |
| Product Form | Free-flowing white to off-white crystalline powder |
| Appearance | Uniform fine powder, no lumps or visible impurities |
| Primary Applications | Epoxy and hybrid (epoxy-polyester) thermosetting powder coatings |
| Key Features | Low-cure, high-gloss, excellent flow and leveling |
| Benefits | Energy-efficient curing, enhanced edge coverage, reduced film defects |
| Storage Conditions | Store in cool, dry place below 25 °C; keep container tightly sealed |
| Shelf Life | 12 months from date of manufacture under recommended conditions |
Q1: What is the primary chemical functionality of EF-403?
A: EF-403 is a blocked isocyanate-based curing agent, designed to provide thermal reactivity in thermosetting powder coatings. Its blocking chemistry enables excellent storage stability at ambient conditions and clean, efficient deblocking upon heating during cure.
Q2: Which resin systems is EF-403 typically formulated with?
A: EF-403 is primarily compatible with hydroxyl-functional polyester resins and acrylics. It is widely used in high-gloss, low-cure, and architectural-grade powder coatings where balanced flow, mechanical performance, and weather resistance are required.
Q3: What is the typical cure schedule for coatings using EF-403?
A: EF-403 enables efficient crosslinking under standard industrial powder coating cure conditions—commonly 180–200 °C for 10–20 minutes. It supports reduced-cure formulations depending on resin selection and formulation design, but optimization requires lab-scale validation.
Q4: How should EF-403 be handled and stored to maintain performance?
A: Store EF-403 in its original sealed container in a cool, dry place below 30 °C, protected from moisture and direct sunlight. Avoid prolonged exposure to humidity or elevated temperatures prior to use, as premature deblocking may affect storage stability and processing behavior.
Q5: Does EF-403 contain formaldehyde or release formaldehyde during cure?
A: No—EF-403 is a formaldehyde-free blocked isocyanate. Its blocking agents are selected to avoid formaldehyde generation under typical powder coating cure conditions, supporting compliance with evolving environmental and occupational health expectations.
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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
