DOW DER663U from Dow's high-performance DER series is a specialized solid epoxy resin designed for critical coating formulations. This bisphenol-A based polymer delivers exceptional chemical resistance and mechanical properties, making it ideal for protective coatings in harsh environments. The product's optimized molecular structure ensures excellent processing characteristics and reliable performance.
High-purity composition - Ensures consistent coating quality
Superior chemical resistance - Withstands aggressive environments
Excellent adhesion - Bonds strongly to multiple substrates
Thermal stability - Performs reliably at elevated temperatures
Processing versatility - Easy to incorporate in formulations
Industrial maintenance coatings - For chemical plants and refineries
Marine and offshore coatings - Protection against saltwater corrosion
Pipeline coatings - Long-term underground protection
Tank linings - Chemical storage solutions
Power plant coatings - High-temperature resistance
| Epoxy Equivalent Weight | g/eq | 700-750 |
| Viscosity at 25°C | cP | 12,000-16,000 |
| Melting Point | °C | 70-80 |
| Gardner Color | - | ≤2 |
| Hydrolyzable Chloride | ppm | ≤500 |
| Softening Point | °C | 75-85 |
| Density at 25°C | g/cm³ | 1.17-1.19 |
| Flash Point | °C | >200 |
Q1: What is the primary functional role of DOW DER663U in epoxy formulations?
A: DOW DER663U is a solid bisphenol-A based epoxy resin designed primarily as a reactive binder and matrix former. It provides structural integrity, thermal stability, and chemical resistance when cured with appropriate hardeners—commonly used in powder coatings, electrical encapsulants, and high-performance composites.
Q2: How does DOW DER663U differ from liquid epoxy resins like DER331 or DER332?
A: Unlike low-viscosity liquid epoxies, DER663U is supplied as a free-flowing solid flake or pellet, offering improved handling safety, reduced VOC potential, and enhanced storage stability. Its higher molecular weight contributes to lower reactivity and slower cure kinetics—making it suitable for applications requiring extended processing windows or controlled crosslink density.
Q3: Which types of curing agents are commonly compatible with DOW DER663U?
A: DER663U is compatible with a broad range of amine-based hardeners—including aromatic diamines (e.g., DDS), dicyandiamide (DICY), and latent imidazole catalysts—as well as anhydride systems. Selection depends on required cure schedule, final performance targets (e.g., glass transition temperature, flexibility), and processing method (e.g., melt-mixing, extrusion, or powder coating).
Q4: Is DOW DER663U suitable for food-contact or potable water applications?
A: DER663U is not pre-qualified for direct food-contact or potable water applications. Formulators must conduct full regulatory evaluation—including migration testing and compliance verification—based on the final cured system, end-use conditions, and applicable regional requirements. Dow recommends consulting regulatory experts before pursuing such applications.
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