Features Of DOW DER383 Bisphenol A Type Epoxy Resin
Low viscosity formula - Superior substrate wetting and penetration
Extended work time - Provides adequate processing window
Multi-system compatibility - Adaptable to various curing mechanisms
Mechanical integrity - Delivers reliable cured properties
Processing efficiency - Easy handling and excellent flow
Typical Applications Of DOW DER383 Bisphenol A Type Epoxy Resin
Composite tooling - Precision molds and fixtures
Electronic encapsulation - Component protection systems
Filament winding - Structural composite manufacturing
Industrial coatings - Protective surface treatments
Adhesive formulations - High-performance bonding solutions
Laminating systems - Reinforced composite structures
Specifications Of DOW DER383 Bisphenol A Type Epoxy Resin
| Epoxy Equivalent Weight | g/eq | 176-183 |
| Viscosity at 25°C | cP | 9,000-10,500 |
| Color (APHA) | - | ≤125 |
| Density at 25°C | g/cm³ | 1.16-1.18 |
| Flash Point | °C | >200 |
| Hydrolyzable Chloride | ppm | ≤500 |
| Weight per Gallon | lb/gal | 9.7-9.9 |
DOW DEN431 Phenolic Epoxy Resin – Frequently Asked Questions (FAQ)
Q1: What is the primary functional advantage of DEN431 compared to standard bisphenol-A epoxy resins?
A: DEN431 is a phenolic novolac-based epoxy resin offering significantly higher functionality and aromatic density than standard DGEBA resins, resulting in enhanced thermal stability, chemical resistance, and crosslink density in cured systems—particularly beneficial for high-performance coatings and electrical encapsulants.
Q2: Is DEN431 suitable for food-contact applications?
A: DEN431 is not pre-approved for direct food-contact use. Formulators must conduct full regulatory evaluation—including migration testing and compliance verification—based on the final cured system, intended application, and applicable regional regulations. Dow does not provide food-contact compliance certification for this grade.
Q3: How is DEN431 typically cured, and what types of hardeners are recommended?
A: DEN431 is commonly cured with aromatic amines (e.g., DDS), dicyandiamide (DICY), or phenolic novolac hardeners. Cure schedules vary widely depending on the hardener selection and end-use requirements—typically involving elevated temperatures (120–180 °C) to achieve optimal network development and performance properties.
Q4: Can DEN431 be blended with other epoxy resins, and what considerations apply?
A: Yes, DEN431 is frequently blended with lower-functionality epoxies (e.g., DGEBA or hydrogenated DGEBA) to balance reactivity, viscosity, flexibility, and thermal performance. Compatibility is generally good, but formulators should assess phase behavior, pot life, and cure kinetics—especially when incorporating reactive diluents or modifiers.
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