Silicone Adhesives

Aerospace Silicone Adhesives & RTV Compounds for Aviation

Silicone adhesives provide flexible, temperature-resistant bonding for aviation applications where rigid adhesive systems are not suitable. Their elastomeric properties accommodate thermal expansion, vibration, and structural flexure while maintaining flexibility across a range of operating temperatures, depending on the specific formulation. .

SkyGeek stocks silicone adhesive systems from Wacker Chemical (Elastosil) and Dow Corning, along with high-temperature firewall sealant-adhesives from Flamemaster. Products are suited to environmental sealing, component potting, vibration damping, and flexible bonding across commercial, military, and business aviation.

Types of Silicone Adhesives Available

One-Part RTV Silicone Adhesives (RTV-1)

Single-component moisture-cure systems for environmental sealing, flexible bonding, and gap filling. Available in neutral and acetoxy cure formulations. Includes Wacker Elastosil E43 and Dapco 3300.

High-Temperature Silicone Adhesives

Formulated for continuous high-temperature service in engine nacelle, firewall zone, and exhaust area applications, rated to 500°F (260°C) or higher depending on grade.

Two-Part Silicone Systems (RTV-2)

Catalyst-cured two-component systems for controlled cure and defined physical properties in avionics potting and encapsulation applications.

Silicone Sealant-Adhesives

Dual-function silicone materials for environmental sealing, bonding, and gasketing, including window installations, access panel sealing, and electrical penetration sealing.

Aviation Applications

Environmental sealing of fairings, access panels, and bonded assemblies
Electrical component and avionics potting
Vibration isolation bonding
High-temperature bonding near engine nacelles and firewalls
Flexible gasketing and joint sealing

Buying Considerations

Cure type: Neutral-cure silicones preferred for metal, electronics, and sensitive substrates. Acetoxy-cure releases acetic acid during cure. Confirm substrate compatibility before use.
Temperature range: Verify the product's continuous service temperature rating against the thermal environment of the application.
Flexibility vs. strength: Silicone adhesives are not structural adhesives. Confirm the application does not require structural adhesive performance per the AMM or SRM.
Cure humidity and time: RTV-1 systems are moisture-cure and require adequate humidity and airflow. Cure time varies with bead diameter and conditions.

Related Resources

For an overview of why silicone and polysulfide sealants are used across different aircraft sealing zones, see SkyGeek's blog post "Aerospace Sealant: Why It Matters for Aircraft Maintenance and Safety". The broader aerospace sealants category at SkyGeek covers polysulfide fuel tank sealants, firewall sealants, and environmental sealing products used alongside silicone adhesive systems in aircraft maintenance programs.

Why SkyGeek for Aerospace Silicone Adhesives

SkyGeek stocks aviation-grade silicone adhesives with product data sheets and SDS available. No membership fees. No minimum order quantities. Special order capability through GracoRoberts for specialty silicone systems.

FAQs

Q: What is RTV silicone used for in aircraft maintenance?

A: Environmental sealing, flexible bonding, vibration damping, electrical component potting, and gasketing in areas requiring flexibility and temperature resistance, including firewall zones, access panels, and avionics compartments.

Q: Does SkyGeek carry Wacker Elastosil E43 silicone adhesive?

A: Yes. Wacker Elastosil E43 is an RTV-1 silicone rubber adhesive and one of the most frequently sourced silicone adhesives in SkyGeek's catalog. Dow Corning silicone adhesive products are also available. Browse Dow Corning products at SkyGeek.

Q: Can silicone adhesives be used as structural adhesives on aircraft?

A: No. Standard silicone adhesives do not meet the load-bearing strength requirements for structural bonding. Structural repairs require adhesive systems qualified to applicable structural specifications as defined in the AMM or SRM. See SkyGeek's blog on aerospace sealant application guidance for more on appropriate use cases for silicone vs. structural bonding systems.