Introduction to Adhesive Solutions for the Aerospace Industry

Aerospace industry core selection criteria: For structural load-bearing applications, employ toughened epoxy or modified epoxy adhesives; for sheet metal riveting and honeycomb sandwich structures, use aerospace structural adhesives; for sealing, pressure relief, and fuel-resistant applications, use polysulfide or fluorosilicone adhesives; for low-temperature vibration damping and composite material bonding, use polyurethane adhesives; for electronic device potting and protection, use addition-curable silicone adhesives; for on-site rapid repair operations, use MMA adhesives. Aerospace-grade products must comply with ASTM, MIL, SAE, and AMS standards, and must also pass flammability tests, low-smoke and low-toxicity tests, thermal cycling tests,
damp heat
aging tests, and immersion tests in fuel or hydraulic oil; aerospace-specific additional tests include ultra-high vacuum, atomic oxygen, ultraviolet irradiation, and cryogenic temperature (-196
 °
C) exposure.

I. Aircraft composite airframe, wings, and tail assemblies (primary load-bearing structures)

Application site	Resin system	Core Performance	Recommended Plan	remarks
Carbon fiber skin + honeycomb sandwich bonding (honeycomb core: aluminum honeycomb / aramid honeycomb)	Aerospacial epoxy structural adhesive film (impact-enhanced epoxy adhesive film)	High specific strength, fatigue resistance, low moisture absorption; cured at 120 °C/177 °C; resistant to combined heat and humidity; complies with AMS standards.	Impact-enhanced epoxy adhesive film	Core structural adhesive; hot-press molding; used for interlaminar bonding of wings, fuselages, and tail surfaces; pre-sandblasting followed by primer application; does not cure at room temperature.
Composite Materials-Structural Bonding of Composite Materials and Composite Materials with Metals (Titanium Alloys / Aluminum Alloys)	Two-component toughened epoxy structural adhesive (paste)	High shear peel strength, reduced thermal stress in composite materials, and resistance to aviation fuel and hydraulic oil	Two-component thixotropic toughened epoxy	Applicable to beams, ribs, and joints; for heterogeneous bonding, residual stress must be carefully controlled, and the metal surfaces shall undergo phosphoric acid anodizing treatment.
Repair of composite structural components (airport field maintenance)	MMA Methyl Acrylate Structural Adhesive	Rapidly cures at room temperature, provides excellent adhesion to carbon fiber, glass fiber, and metals, exhibits high toughness, and requires no hot pressing tank.	Aerospace-grade MMA structural adhesive	Aircraft operation, maintenance, and emergency repair: construction is feasible in low-temperature conditions; ensure proper odor control and maintain adequate ventilation during construction.
Interlayer defects and pit filling	Epoxy putty (thixotropic)	Low shrinkage, grindable, with modulus compatibility to the composite matrix.	Thixotropic epoxy repair putty	The skin surface shall be leveled; it shall not serve as the primary load-bearing surface.

II. Sheet metal, doors, fairings, and airframe sealing

1. Body rivet joints, fuel tank sealing (fuel compartment)
   1. System: Polysulfide sealant
   1. Performance: resistance to JP-8 aviation kerosene and fuel immersion, elasticity, resistance to fuel penetration, low permeability; flame retardant, and long-term fatigue resistance.
   1. Applications: overall wing fuel tanks, fuel tank seams, and fastener hole sealing; a classic adhesive formulation for aviation fuel tanks.
2. Sealing of non-fuel compartments, compartment doors, fairings, and inspection hatch covers
   1. Option A: Fluorosilicone sealant – resistant to extreme temperatures (-60 °C to 205 °C), hydraulic oil, and chemicals; suitable for use in high-temperature engine areas.
   1. Option B: MS-modified silane – low VOC, no primer required, low smoke and low toxicity; suitable for sealing non-fuel joints within the fuselage.
3. Radome (wave-transparent component)
   1. Low-dielectric epoxy/silicone rubber; low dielectric constant and low loss, without compromising electromagnetic wave penetration; UV-resistant and resistant to high-altitude aging.

III. Engine short casing and the periphery of the hot end (high-temperature zone)

• Bonding of short-cell composite structures: high-temperature resistant and toughening epoxy/polyimide adhesive, with short-term temperature resistance up to 250 °C and resistance to thermal cycling.
• High-temperature sealing of piping and flanges: fluorosilicone sealants, phenyl silicone; resistant to high temperatures, lubricating oils, and aging.

Aerospace industry note: standard epoxy resin is not resistant to high temperatures; the use of conventional PU adhesive around the engine is strictly prohibited.

IV. Aircraftborne Electronics and Avionics Control Cabinets (Aircraft Black Box, Sensors, PCBs)

1. Thermal potting of power devices, inductors, and transformers
   1. Addition-type silicone thermal conductive potting compound: low stress, wide temperature range, UL94-V0 flame retardancy, suitable for severe temperature cycling; no by-products, non-corrosive to electronic components.
2. PCB hermetic coating and component mounting
   1. Silicone-based RTV / low-stress epoxy; low-outgassing formulation to prevent silicon migration and contamination of contacts; low outgassing performance under high-altitude, low-pressure conditions (ASTM E595).
3. Sealing of cable connectors and connectors
   1. Flexible silicone potting compound; waterproof, moisture-resistant, resistant to low pressure at high altitudes, and resistant to ozone aging.

V. Aerospace-specific applications (rockets, satellites, spacecraft)

1. Satellite structure and honeycomb interlayer bonding: high-purity epoxy adhesive film with low outgassing, compliant with ASTM E595, and resistant to atomic oxygen and space ultraviolet radiation;
2. Propellant piping and tank sealing: specialized fluorosilicone sealant, resistant to propellants, and stable under ultra-high vacuum conditions;
3. Encapsulation of electronic components for space applications: space-grade addition-curable silicone with extremely low volatility, capable of withstanding cryogenic temperatures down to-196 °C;
4. Insulation layer bonding: Low-modulus silicone, capable of withstanding extreme temperature-induced deformation and providing vibration damping.

VI. Aerospace Industry Adhesives: Comparative Selection Guide

Resin type	superiority	short slab	Aerospace application scenarios
Impact-enhanced epoxy adhesive film	Ultra-high strength, oil resistance, and high modulus—making it the preferred choice for primary load-bearing applications.	Requires heating for curing; low-temperature toughness is limited.	Wing / fuselage honeycomb sandwich structure; primary structure bonding
Paste-type toughening epoxy	Curable at room or medium temperature; suitable for bonding composite and metallic materials.	Relatively hard with low elongation rate	Structural joints and rib beam bonding
MMAstructural adhesive	Rapid curing at room temperature, convenient on-site repair, and excellent toughness.	It has a strong odor, and its long-term performance under humid and hot conditions is inferior to that of epoxy resin.	On-site emergency repair of aircraft and structural bonding of small components
polysulfide sealant	Excellent resistance to aviation fuel; standard materials for the fuel tank.	Moderate temperature resistance upper limit; slow curing rate.	Wing fuel tank sealing and fastener joint sealing
Fluorosilicone sealant	Oil-resistant + high-temperature resistant; resistant to hydraulic fluids	High cost, with moderate bonding strength	Sealing around the engine and high-temperature pipelines
Addition-type silicone	Wide temperature range, low stress, low outgassing, and excellent insulation properties	The structural strength is insufficient; it cannot be used as a load-bearing component.	Aircraft avionics hermetic sealing, space components, vibration isolation sealing
MS-modified silane	No primer required, paintable, low smoke and low toxicity, easy to apply	Poor fuel resistance	Non-fuel assembly seals within the engine compartment

VII. Key Performance Indicators for Adhesives in Aerospace Applications (Key Differences from Wind Power Applications)

1. Low Outgassing – ASTM E595: A mandatory requirement for aerospace applications; ensures that no small molecules are released after adhesive curing, thereby preventing contamination of optical lenses and sensors; also recommended for aerospace and avionics applications.
2. Low smoke and low toxicity (FAR 25.853): interior cabin materials that emit low smoke and low toxicity gases upon combustion;
3. Fluid Resistance: Strength retention rate after immersion in aviation fuel, hydraulic oil, or lubricating oil;
4. Thermal cycling: repeated exposure to temperature swings from –55 °C to +120 °C to simulate high-altitude environments;
5. Flame retardancy: UL94-V0 / FAR flame retardancy standard;
6. Surface treatment: phosphoric acid anodizing of aluminum alloys, sandblasting of titanium alloys, and removal of release agents from composite materials; the surface treatment directly determines the bond life.

This aerospace industry overview draws on the full JOME product catalogue JOME manufactures in house. Engineers comparing notes with Wind Turbine Whole Machine Adhesive Solution Onshore can move between the two guides; the JOME industrial adhesives homepage frames the range and the get input from the JOME engineering desk takes it from there.