Selecting Insulation Solutions: Thermal, Acoustic, and Fire Protection

Insulation is a critical factor in aircraft design. It is vital to ensure components like pipes and ducts utilized in high-temperature environments, wings, fuselage, airframe, and engine areas receive proper thermal protection. Selecting the best materials to provide the highest levels of thermal management, acoustic insulation, and fire safety is essential to keep the crew and passenSegers comfortable and safe while also keeping utility costs low and reducing energy consumption. Strict standards and specifications must be met regarding design, construction, installation, reliability, and safety.

RCF Technologies Thermal Insulation Thumbnail. Paulie Rose holding Rishon Insulation. Orange and Blue background
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Thermal Insulation

Thermal insulation is the process of restricting and controlling the transfer of heat between one object and another. Proper thermal insulation for components utilized in high temperature environments is crucial for efficient performance. Insulation materials also support the structural integrity of various aerospace components. They provide strength and durability, ensuring the safety and longevity of the aircraft. Additionally, ample insulation serves to keep utility costs low and reduce energy consumption as well. Therefore, finding the most appropriate insulative materials is of paramount importance.

Acoustic Insulation

Acoustic insulation reduces noise transmission from one area to another.  Not only does acoustic insulation make for a more pleasant flying experience, but the FAA also requires aircraft to include acoustic insulation as it guarantees that excessive noise created by the aircraft doesn’t interfere with communication.

Insulation as Fire Protection

In addition to insulating against heat, fire protection is also essential. Firewalls, fire blankets, and other fire protection for various components are necessary elements in the construction of any aircraft for obvious reasons. Clearly, the more flexible, easy to install, and light weight this fire protection can be, the better. Specifications for these materials are rigorous as there is much at stake.

Thermal Conductivity in Aerospace Insulation

The impact of thermal conductivity on aerospace insulation cannot be overstated. Low thermal conductivity is crucial in aerospace insulation ensuring optimal performance and safety. Insulation is one of the best means of restricting and controlling heat loss and heat transfer. This heat management will not only lessen thermal stress on critical systems, but will promote longevity, performance, efficiency, and reliability.

Where Insulation is Used

Common applications utilizing insulation include:

  • Aircraft appliance insulation
  • Aircraft heat shields
  • Cable wraps
  • Cryogenic insulation
  • Electronics fire protection
  • Engine blades
  • Engine gaskets
  • Fire protection
  • Fire walls / doors
  • Fuel tanks
  • Fuselage
  • Gaskets
  • Helicopter struts
  • Hydraulic / air lines
  • Nacelle insulation

Selecting Insulation Materials for Aerospace Applications

Selecting insulation materials for aerospace applications involves consideration of several factors:

Temperature Range

An understanding of the specific aerospace application’s temperature range and operating conditions is essential. Different insulation materials have varying temperature requirements and performance characteristics, so it is crucial to choose a material that can withstand the unique conditions of each particular aircraft and application.


Another important factor to consider is the weight and space constraints. Insulation materials used in aerospace applications must be lightweight and compact to minimize the impact on the overall weight of the aircraft. This is especially critical in the aviation industry, where every ounce and inch matter. In some situations, custom insulation solutions utilizing techniques like airgaps can be utilized to improve the insulative results while reducing additional weight.

Fire Resistance

Fire resistance requirements must also be evaluated. Aerospace applications demand adherence to FAA requirements which call for highly fire-resistant materials. This factor is critical to ensure the safety of passengers and crew in case of any fire incidents.

Acoustic Insulation

Eliminating all noise generated by an aircraft is certainly impossible, but mitigating noise is an important consideration. It is essential to reduce aircraft noise levels and provide travelers with a comfortable environment.

Chemical Compatibility

In some areas of an aircraft, insulation material will encounter various chemical fluids. Exposure to these fluids may cause the insulation material to react negatively leading to damage and deterioration. Selecting an insulation material that is chemically compatible is significant.

Standard Insulation Solutions

Standard insulation solutions span a broad range of material options. Some have been relied upon for decades and others are newer to the market. Common insulation materials include fiberglass, mineral wool, cellulose, polyurethane foam, polystyrene (EPS), and polyimide foam. Each of these materials is intended to control and mitigate heat conduction, convection, and radiation. There is however, a new and improved insulation material – RishonX Material.

An Improved Insulation Solution: RishonX Material

RCF Technologies provides an improvement on current insulation solutions utilizing proprietary RishonX material.

RishonX material has an operating temperature range of -170°F to +850°F. Varying thicknesses provide different protections against various heat levels. For example: A 0.90” layer of RishonX material can provide temperature drops as great as 600°. Whether an operating environment is frigid, or components need protection from extreme heat, RishonX offers an ideal insulating material.

In addition to insulation from heat, RishonX also insulates against fire. Over a 15-minute burn, RishonX maintained the following backside temps:

Backside Temperature Material Thickness
106° F .225”
280° F .050”


RishonX insulation material also shows no signs of deterioration following exposure to most chemical fluids found on aircraft.

RishonX insulation offers additional benefits, including:

  1. Fire resistance
  2. Chemical compatibility
  3. High temperature ranges
  4. Sound and vibration attenuation
  5. Electrical conductivity
  6. Vulcanization
  7. Low outgassing

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Whether an operating environment is frigid, or components need protection from extreme heat, RishonX offers an ideal insulating material.

More information about our thermal insulation products and our proprietary RishonX material can be found at