Henkel LOCTITE-STYCAST-HD-3404 BLACK (1-Usgl-Can)

LOCTITE® STYCAST® EE 4215 / HD 3404 Epoxy Potting & Encapsulating Compound

Overview

LOCTITE® STYCAST® EE 4215 / HD 3404 is a two-component, silica-filled epoxy casting compound designed for high-performance potting and encapsulation applications. The undiluted epoxy system offers excellent thermal stability, low shrinkage, reduced thermal expansion and low moisture absorption, making it ideal for protecting electronic assemblies and electrical components operating in demanding industrial and aerospace environments. The cured material provides high mechanical strength, excellent electrical insulation and reliable long-term dimensional stability.

Key Technical Specs

• Product Type: Two-component silica-filled epoxy casting compound
• Product Code: LOCTITE® STYCAST® EE 4215 / HD 3404
• Technology: Epoxy
• Colour (Cured): Black
• Mix Ratio (Volume): 100 : 9 (Part A : Part B)
• Mix Ratio (Weight): 100 : 5.5 (Part A : Part B)
• Pot Life: Approximately 20 minutes (200 g mass @ 25°C)
• Gel Time: Approximately 25 minutes @ 25°C
• Recommended Cure: 2 hours at 60°C
• Alternative Cure: 24 hours at 22°C
• Density (Cured): 1.66 g/cm�
• Thermal Conductivity: 0.549 W/m�K
• Heat Deflection Temperature: 100°C
• IEEE Operating Class: 105°C

Approvals & Specifications

• IEEE Guide to Operating Class: 105°C
• Electrical testing to IEC 60093, IEC 60243-1 and IEC 60250
• Mechanical testing to ISO 527-2, ISO 604 and ISO 178
• Thermal expansion measured to ASTM D7012
• Thermal conductivity tested to ASTM C177
• Linear shrinkage tested to ASTM D792

Performance Highlights

• High thermal conductivity for improved heat dissipation
• Low coefficient of thermal expansion
• Low linear shrinkage (0.38%)
• Low moisture absorption (0.07% after 24 hours)
• Excellent electrical insulation with dielectric strength of 59.8 kV/mm
• High tensile strength (62.1 MPa)
• High compressive strength (117.2 MPa)
• High Shore D hardness of 87
• Excellent dimensional stability after curing

Typical Applications

• Potting of electronic assemblies
• Encapsulation of electrical components
• Protection of aerospace electronic systems
• Industrial electrical insulation
• Casting of sensors, transformers and control modules
• Applications requiring mechanical protection and moisture resistance

Compatibility & Safety Notes

• Two-component system requiring accurate mixing before use
• Resin may crystallise if stored below 10°C and should be warmed to 50-60°C before use if crystallisation occurs
• Store unopened containers between 8°C and 28°C
• Do not return unused mixed material to original containers
• Refer to the Safety Data Sheet (SDS) before handling

Application & Curing

• Mix Ratio (Volume): 100 : 9
• Mix Ratio (Weight): 100 : 5.5
• Pot Life: Approximately 20 minutes at 25°C
• Gel Time: Approximately 25 minutes
• Recommended Cure Cycle: 2 hours at 60°C
• Alternative Ambient Cure: 24 hours at 22°C
• Mixed Viscosity: Approximately 10,500 mPa�s at 25°C
• Peak Exotherm: Approximately 100°C (200 g mass)

Packaging & Procurement

• Supplied as a two-component epoxy system
• Consists of EE 4215 Resin (Part A) and HD 3404 Hardener (Part B)
• Available through Henkel authorised distributors worldwide

Why This Product is Chosen for AOG / MRO

• Excellent electrical insulation for critical aerospace electronics
• High mechanical strength protects sensitive components
• Low shrinkage minimises stress on encapsulated assemblies
• Reliable thermal performance for demanding operating environments
• Suitable for long-term protection against moisture and vibration

Practical Suggestions for Your Team

• Measure resin and hardener accurately to maintain full material performance
• Mix thoroughly while minimising air entrapment
• Use the recommended heat cure wherever possible for optimum properties
• If resin crystallises during storage, warm gently before mixing
• Keep materials within recommended storage temperatures to maximise shelf life

Manufacturer / Aviation Spec Codes

• Product Name: LOCTITE® STYCAST® EE 4215 / HD 3404
• Manufacturer: Henkel
• Technology: Silica-filled epoxy casting compound
• Application: Potting and encapsulation of electronic and electrical components
• Operating Temperature Class: IEEE Class 105