Astro 3601 is a lightweight, flame-resistant epoxy potting compound engineered for aircraft interior applications, including structural sandwich panels and cabin components. It is formulated for applications requiring low density, flammability compliance, and ease of use.

Astro 3601 is designed to meet vertical flammability requirements under 14 CFR Part 25.853(a) while also providing strong mechanical performance and a more EHS-friendly formulation profile.

When should Astro 3601 be used?

• A flame-resistant potting compound is required for aircraft interior structures.
• Weight reduction is important.
• A smoothable, non-sag adhesive is preferred.
• An EHS-friendly alternative to conventional potting materials is desired.

Key properties of Astro 3601

• Passes vertical flammability requirements under 14 CFR Part 25.853(a).
• Low density design, approximately 0.7 g/cm³.
• Easy 4:1 mix ratio.
• Pumpable, non-sag paste consistency.
• Approximately 40-minute working time.
• 24-hour room-temperature cure.
• Non-halogenated formulation.
• Non-CMR profile, meaning it is not formulated with carcinogenic, mutagenic, or reprotoxic components.

Typical applications

Astro 3601 is intended for aircraft interior potting and bonding applications where flame resistance and low weight are important. Typical uses include potting and securing fasteners in structural sandwich panels, bonding and filling within cabin interior assemblies, and lightweight fill applications in aircraft interior structures. Its balance of properties also supports use across a range of related aircraft interior bonding, potting, and fill applications.

How Astro 3601 compares

Compared with conventional structural potting compounds, Astro 3601 is designed specifically for aircraft interior use. Its low-density formulation supports weight-sensitive assemblies, its flammability performance supports regulated interior applications, and its handling characteristics support easier processing in both production and maintenance environments. Its non-CMR, EHS-friendly profile also makes it a strong alternative to legacy aviation potting chemistries.

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