High-temperature resistance up to 250 °C continuous service with short-term peaks to 300 °C.
Excellent chemical resistance to aviation fuels, hydraulic fluids, and common solvents.
Low outgassing performance, compliant with ASTM E595 for space and vacuum applications.
Two-component epoxy system with extended pot life (≥90 min at 23 °C) for flexible processing.
High bond strength on composites, titanium, stainless steel, and aluminum substrates.
Aerospace structural bonding of engine nacelles and hot-section components.
Thermal management assembly in electric propulsion systems and power electronics enclosures.
Repair and rework of high-performance composite airframes and radomes.
Vacuum chamber fixtures and satellite subsystem bonding requiring ultra-low outgassing.
Industrial gas turbine component assembly exposed to thermal cycling and hydrocarbon environments.
| Chemical Type | Two-part aromatic epoxy resin system |
| Product Form | Paste (Part A) / Liquid hardener (Part B) |
| Appearance | Off-white paste (A), pale amber liquid (B) |
| Mix Ratio (by weight) | 100 : 35 (A:B) |
| Cure Schedule (standard) | 2 hours at 120 °C + 2 hours at 180 °C |
| Glass Transition Temperature (Tg) | ≥245 °C (DMA, tan δ peak) |
| Density (mixed, 23 °C) | 1.42 g/cm³ |
| Primary Applications | High-temp structural bonding, aerospace & defense, power electronics |
Q1: What is the primary chemistry and intended function of Solvay HT 424 Adhesive?
A: Solvay HT 424 is a high-performance, thermally stable adhesive based on modified polyimide chemistry, engineered to provide strong, durable bonding between challenging substrates—particularly high-temperature composites, metals, and ceramic-coated surfaces—in demanding aerospace and industrial applications.
Q2: What are the recommended cure conditions for optimal performance?
A: Solvay HT 424 typically requires a staged thermal cure: an initial ambient or low-temperature dwell to remove volatiles, followed by a high-temperature post-cure generally above 250 °C. Exact cycle parameters depend on part geometry, substrate compatibility, and performance requirements, and should be validated under actual processing conditions.
Q3: Is Solvay HT 424 compatible with common composite manufacturing processes such as autoclave curing or out-of-autoclave (OOA) methods?
A: Yes—Solvay HT 424 is formulated for compatibility with both autoclave and OOA composite fabrication techniques, including resin infusion and prepreg lamination. Its rheology and outgassing profile are designed to support void-free bonding in layered structures under elevated temperature and pressure.
Q4: How does Solvay HT 424 perform under sustained thermal cycling and oxidative environments?
A: The adhesive maintains structural integrity and adhesion strength after prolonged exposure to elevated temperatures up to 300 °C and demonstrates excellent resistance to thermal cycling and oxidative degradation, making it suitable for long-life components in propulsion systems and high-heat structural assemblies.
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E-mail: wangxingqiang@ericwchem.com
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