Aerogel Felt vs Traditional Insulation Materials: Which Is Better?

Selecting an insulation material is not simply a matter of choosing the product with the highest temperature rating or lowest initial price. Thermal conductivity, installation thickness, moisture resistance, available space and long-term maintenance costs must all be considered.

Aerogel felt is increasingly used as an alternative to traditional insulation materials such as mineral wool, glass wool, ceramic fiber and calcium silicate. However, each material has its own advantages and suitable applications.

This article compares aerogel felt with commonly used insulation materials to help engineers, contractors and industrial buyers make a more suitable choice.

What Is Aerogel Felt?

Aerogel felt, also called an aerogel blanket, is a flexible insulation material made by combining silica aerogel with a fibrous reinforcement layer.

The nanoscale pore structure of silica aerogel restricts heat transfer through solid conduction, gas movement and convection. The reinforcing fibers improve flexibility and mechanical strength, allowing the material to be rolled, cut and wrapped around pipes, valves, tanks and industrial equipment.

Keep Insulation's aerogel felt range includes different thicknesses and operating-temperature grades for industrial insulation projects.

Common applications include:

Oil and gas pipelines

Petrochemical equipment

High-temperature steam pipes

LNG and low-temperature systems

Storage tanks and vessels

Power-generation equipment

Marine and offshore installations

Removable insulation covers

Industrial furnaces and heat-treatment equipment

What Are Traditional Insulation Materials?

Traditional insulation materials include several product types rather than one specific material.

Mineral Wool

Mineral wool is produced from molten rock or industrial mineral materials. It offers a practical balance of thermal insulation, fire resistance, sound absorption and cost.

It is widely used for buildings, HVAC systems, industrial equipment and general pipeline insulation.

Glass Wool

Glass wool is manufactured from fine glass fibers. It is lightweight, flexible and commonly used in building walls, roofs, air-conditioning ducts and low- to medium-temperature systems.

Ceramic Fiber

Ceramic fiber is designed for elevated-temperature applications. It is commonly supplied as blankets, boards, papers and modules for furnaces, kilns, boilers and other high-temperature equipment.

Calcium Silicate

Calcium silicate is a rigid insulation material with good compressive strength and high-temperature stability. It is frequently used around industrial pipes, boilers and process equipment.

Performance Comparison

These comparisons are general. Exact performance depends on product density, formulation, temperature, thickness and test conditions.

1. Thermal Conductivity

Thermal conductivity indicates how easily heat passes through a material. A lower value generally means better insulation performance at the same thickness.

Many industrial aerogel felt products have thermal conductivity values of approximately 0.015–0.020 W/(m·K) at or near room temperature.

For example, Nano Aerogel Felt is available with a listed thermal conductivity of approximately 0.018–0.020 W/(m·K) at 25°C. Actual values depend on the selected grade and test conditions.

Typical room-temperature values for conventional materials are generally higher:

The exact values should only be compared when the test temperature and method are the same.

Aerogel felt generally offers the greatest advantage when a project requires high thermal resistance within a limited insulation thickness.

Advantage: Aerogel Felt

2. Insulation Thickness

Traditional insulation materials can achieve effective thermal performance, but they normally require a thicker layer.

In areas with sufficient installation space, this may not be a significant problem. However, additional thickness can create difficulties around:

Closely spaced pipelines

Valves and flanges

Narrow maintenance passages

Equipment with limited clearance

Offshore and marine installations

Compact processing systems

Existing insulation systems being upgraded

Because of its lower thermal conductivity, aerogel felt can often achieve the required insulation performance with less thickness.

This can reduce the overall diameter of insulated pipes and make installation easier in restricted spaces. It may also reduce the amount of external cladding and support material required.

The required thickness must still be confirmed through thermal calculations. Aerogel felt should not be selected based on a general thickness-reduction claim alone.

Advantage: Aerogel Felt

3. High-Temperature Performance

The maximum operating temperature depends on the formulation and reinforcement of each insulation product.

Ceramic fiber is commonly selected for very high-temperature applications such as:

Industrial furnaces

Kiln linings

Heat-treatment equipment

Boiler insulation

Furnace doors

High-temperature expansion joints

Aerogel felt can also be used for high-temperature pipelines and equipment. For example, Aerogel Thermal Insulation Felt is designed for industrial pipelines, furnaces, power equipment, petrochemical facilities and other demanding applications.

However, aerogel felt thermal conductivity normally increases as the mean temperature rises. Buyers should request conductivity data across the actual operating range, not only at 25°C.

For extremely high furnace temperatures or direct hot-face linings, ceramic fiber may be more suitable. For pipelines and equipment requiring a thinner external insulation layer, aerogel felt may offer better overall performance.

Advantage: Depends on the temperature and application

4. Moisture and Water Resistance

Moisture can significantly reduce the effectiveness of many conventional fibrous insulation materials. If water enters an insulation system, it may lead to:

Higher thermal conductivity

Increased heat loss

Longer drying time

Damage to the external cladding

Corrosion under insulation

More frequent maintenance

Mineral wool and glass wool generally require correctly designed vapor barriers, weather barriers or metal cladding to prevent water penetration.

Hydrophobic aerogel felt resists liquid water while retaining its flexible structure. Some grades provide hydrophobic rates above 99%, making them useful for outdoor pipelines, marine equipment and humid industrial environments.

However, hydrophobic insulation does not make the complete system waterproof. Joints, seams, penetrations and cladding must still be properly sealed.

Advantage: Aerogel Felt

5. Fire Performance

Mineral wool, glass wool, ceramic fiber, calcium silicate and silica aerogel products are commonly selected for applications requiring non-combustible or fire-resistant insulation.

However, fire performance must be evaluated according to the complete product rather than only the primary raw material. Facing materials, binders, adhesives and outer coverings can affect the final classification.

Insulating Aerogel Felt is available in grades with specified fire-performance characteristics. Buyers should request the relevant fire test report when a project must comply with a particular standard.

Ceramic fiber remains particularly suitable for furnace linings and applications involving extremely high temperatures. Mineral wool is widely used for passive fire protection and building insulation because of its balance between cost and fire performance.

Advantage: Depends on the required fire standard

6. Flexibility and Installation

Aerogel felt is flexible and can be cut with standard insulation tools. It conforms well to curved and irregular surfaces, including:

Pipes

Elbows

Tees

Valves

Flanges

Pumps

Turbines

Storage vessels

Mineral wool and glass wool blankets are also flexible, but greater thickness may make installation more difficult in narrow areas.

Ceramic fiber blankets are easy to wrap around high-temperature equipment but may require careful handling and suitable protective measures during cutting and installation.

Calcium silicate is supplied as rigid sections or boards. It offers good compressive strength but is more difficult to fit around complicated shapes and may crack during handling.

Aerogel felt can reduce installation volume and the number of layers required, but installers should use gloves, protective eyewear and suitable dust protection when cutting and handling the material.

Advantage: Aerogel Felt for complex and restricted installations

7. Mechanical Strength and Durability

Different insulation materials respond differently to vibration, impact and repeated maintenance.

Aerogel felt has a reinforced flexible structure that can tolerate normal handling, vibration and thermal cycling. It is also less likely to crack than rigid insulation.

Mineral wool and glass wool may become compressed or damaged if exposed to repeated mechanical pressure. Ceramic fiber blankets can also experience surface wear in high-velocity or frequently handled environments.

Calcium silicate has better compressive strength and may be preferred where the insulation must withstand greater mechanical loads. However, it is relatively brittle and may crack under impact.

External cladding is still recommended for aerogel felt when the system is exposed to weather, traffic or mechanical damage.

Advantage: Depends on the type of mechanical exposure

8. Installation Space and Total Weight

Aerogel felt is particularly useful when the insulation envelope must remain compact.

A thinner system may provide several project benefits:

Smaller finished pipe diameter

Easier access between adjacent pipelines

Reduced cladding dimensions

Less interference with valves and supports

Lower insulation volume

Easier installation in compact equipment areas

Although aerogel felt has a higher density than some lightweight fibrous blankets, the total system can remain relatively light because less thickness is required.

For large building areas where space is not restricted, glass wool or mineral wool may remain more economical.

Advantage: Aerogel Felt where space is limited

9. Initial Cost vs Lifecycle Cost

Aerogel felt normally has a higher purchase price per square metre than mineral wool or glass wool.

If materials are compared only by initial unit price, conventional insulation often appears more economical. However, a complete project comparison should also include:

Required insulation thickness

Number of installed layers

Labour requirements

External cladding size

Support-system modifications

Transportation and storage volume

Heat-loss costs

Maintenance frequency

Downtime during replacement

Expected service life

Aerogel felt may provide a lower lifecycle cost when reduced heat loss, limited installation space or moisture-related maintenance is important.

Traditional materials may remain the better commercial choice for large, uncomplicated areas with sufficient space and moderate performance requirements.

Advantage: Traditional materials for lower initial cost; aerogel felt may offer better lifecycle value

Comparison by Application

When Should You Choose Aerogel Felt?

Aerogel felt is generally worth considering when:

Installation space is limited

A thin insulation system is required

Heat loss must be minimized

Equipment operates at high or low temperatures

Pipes and equipment have complex shapes

The installation is exposed to moisture

Reducing total insulation volume is important

Corrosion under insulation is a concern

Access for maintenance is restricted

Long-term energy performance is more important than initial price

An aerogel insulation blanket can be supplied in different thicknesses and temperature grades according to project conditions.

When Are Traditional Materials More Suitable?

Traditional insulation may be more appropriate when:

The project has sufficient installation space

Initial budget is the main consideration

The operating temperature is moderate

Large wall, roof or duct areas need to be covered

The system is installed in a dry indoor environment

High compressive strength is required

A specific traditional material is required by the project specification

Local installers are more familiar with conventional systems

The best insulation material is not always the one with the lowest thermal conductivity. It is the one that meets the complete technical and commercial requirements of the project.

Information Buyers Should Provide

Before requesting a quotation or material recommendation, provide the supplier with:

Intended application

Normal operating temperature

Maximum and minimum temperatures

Pipe diameter or equipment dimensions

Required surface temperature

Maximum allowable heat loss

Available insulation space

Indoor or outdoor installation

Exposure to water, oil or chemicals

Required fire standard

Desired insulation thickness

Outer cladding design

Project quantity

Required test reports

Providing complete information helps the supplier compare aerogel felt with conventional insulation under the same working conditions.

Frequently Asked Questions

Is aerogel felt always better than mineral wool?

No. Aerogel felt offers lower thermal conductivity, reduced thickness and better moisture resistance, but mineral wool generally has a lower initial cost. Mineral wool may be more suitable for large areas where space is not limited.

Can aerogel felt replace ceramic fiber?

It depends on the operating temperature and installation position. Aerogel felt can be used for many high-temperature pipelines and equipment, while ceramic fiber is often more suitable for extremely hot furnace and kiln applications.

Is aerogel felt suitable for outdoor pipelines?

Yes. Hydrophobic aerogel felt is commonly used for outdoor industrial pipelines. A properly designed metal or weather-resistant outer covering is still required.

Does aerogel insulation require less thickness?

In many applications, aerogel felt can achieve the required thermal resistance with less thickness than mineral wool, glass wool or calcium silicate. The exact reduction must be confirmed through thermal calculations.

Why is aerogel felt more expensive?

Its cost reflects the silica aerogel material and specialized manufacturing process. Buyers should compare the complete installed and lifecycle costs rather than only the price per square metre.

Can aerogel felt be installed in multiple layers?

Yes. Multiple layers can be used to achieve the required insulation thickness. The joints between layers should be staggered to reduce thermal bridging.

Conclusion

Aerogel felt provides clear advantages in thermal performance, thickness reduction, moisture resistance and installation flexibility. It is particularly suitable for industrial pipelines, oil and gas equipment, LNG systems, power plants and projects with restricted installation space.

Traditional insulation materials remain valuable. Mineral wool and glass wool offer economical solutions for large general-purpose areas, ceramic fiber performs well in extremely high-temperature equipment, and calcium silicate provides useful compressive strength.

Therefore, there is no single material that is best for every application. Buyers should compare thermal conductivity at the actual operating temperature, required thickness, environmental exposure, installation complexity and total lifecycle cost.

When space-saving performance, moisture resistance and long-term thermal efficiency are priorities, aerogel felt is often the stronger choice.