Selecting the right insulation material is an important part of designing reliable electrical systems and components. Material properties such as dielectric performance, moisture resistance, durability, thickness, and fabrication requirements all play a role in determining which option is best for a specific application.
Fish paper and polyester film are two materials commonly used for electrical insulation, but they are designed to meet different application needs. Understanding how these materials compare can help engineers, manufacturers, and designers choose the right solution for their project.
Fish paper is a vulcanized fiber material that has been used in electrical insulation applications for many years. Despite its name, fish paper does not contain any fish-derived materials. The name comes from the material’s smooth appearance, which historically resembled fish skin.
Fish paper is manufactured from cellulose-based fibers that are processed to create a durable electrical insulation material. It is commonly used in custom fabricated components where dependable electrical insulation and mechanical strength are required.
Fish paper is used in a range of electrical insulation applications where the finished component needs to provide separation, protection, or insulation between parts. Because the material is available in different thicknesses and can be supplied with pressure-sensitive adhesive backing, it can be adapted for different component designs.
Common fish paper applications include:
For some projects, fish paper may provide the right balance of insulation performance and durability. For others, a different material may be a better fit depending on thickness, bend requirements, moisture exposure, or the finished part design. This is why material selection should be reviewed before production begins.
Fish paper remains a useful electrical insulation material because it can be fabricated into custom components for a variety of applications. Its performance depends on the selected thickness, part design, and operating environment, which makes proper material selection important.
Fish paper is commonly used to help insulate and separate electrical components. It can be a practical option when the application requires a custom insulation part made to specific dimensions.
Depending on the grade and thickness, fish paper can provide mechanical strength for components that need protection, separation, or support within an electrical assembly.
American Micro Industries offers fish paper in sheet stock, PSA-backed material, and custom-fabricated parts. This gives customers flexibility when designing components for assembly and production.
Because fish paper is available in different thicknesses, customers can select a material that better fits the finished part. Thinner material may offer different handling characteristics than thicker materials, so the application should guide the final selection.
Polyester film is a thin, durable material used in electrical insulation and custom-fabricated components. It is often selected when an application requires strong electrical insulation performance, moisture resistance, dimensional stability, and a clean finished appearance.
American Micro Industries can fabricate polyester film parts using appropriate cutting methods based on the material, part design, and specifications. Because polyester film cannot be CNC machined, the fabrication method should be reviewed before production begins to make sure the finished component can be produced accurately.
Polyester film is used in a variety of electrical insulation applications where dimensional stability, moisture resistance, and dependable electrical performance are important. Because it is available in multiple thicknesses, it can be fabricated into custom components that meet specific application requirements.
Common applications for polyester film include:
American Micro Industries fabricates polyester film into custom components based on customer drawings and specifications. Our team can help determine whether polyester film is the right material for your application and recommend the most appropriate fabrication method.
Polyester film is often selected for electrical insulation applications that require a thin, stable, and moisture-resistant material. Its performance characteristics make it useful for custom components where consistency and long-term reliability are important.
Electrical Insulation Performance
Polyester film provides dependable electrical insulation for applications where a thin material is needed. This makes it useful for components that require insulation without adding unnecessary thickness.
Moisture Resistance
Polyester film offers strong resistance to moisture, which can help the material maintain consistent performance in applications where humidity or environmental exposure may be a concern.
Dimensional Stability
Polyester film is known for maintaining its shape and size well. This is especially important for custom fabricated parts that need to fit consistently within an electrical assembly.
Thin Material Options
Because polyester film is available in thin gauges, it can be a good fit for applications where space is limited or where a lightweight insulation material is preferred.
Fish paper and polyester film are both used in electrical insulation applications, but each material offers different characteristics that may make it a better fit for certain projects. Understanding these differences can help simplify the material selection process.
Fish paper is a vulcanized fiber material made from cellulose-based fibers, while polyester film is a synthetic material. These differences in construction contribute to each material’s performance characteristics and typical applications.
Polyester film offers strong moisture resistance and dimensional stability, making it a good option for applications where environmental exposure is a consideration. Fish paper is available in a range of thicknesses and should be selected based on the operating environment and performance requirements.
Both materials are available in multiple thicknesses, and thickness plays an important role in how the finished component performs. Fish paper may exhibit different characteristics depending on the thickness selected, while polyester film provides a thin insulation option for applications where space is limited.
Both fish paper and polyester film can be fabricated into custom electrical insulation components. The most appropriate fabrication method depends on the material, thickness, part design, and application. American Micro Industries can help determine the best approach based on your project specifications.
Fish paper may be the right choice when a project requires a proven electrical insulation material that can be fabricated into custom components. Because it is available in a variety of thicknesses, the material should be selected based on the specific requirements of the application.
Fish paper may be a good fit for projects that require:
American Micro Industries can help determine the appropriate fish paper thickness and fabrication method based on your drawings, specifications, and performance requirements.
Polyester film is often the better choice when an application requires a thin electrical insulation material with strong dimensional stability and moisture resistance. It is commonly used for custom-fabricated components where consistent performance and precise dimensions are important.
Polyester film may be a good fit for projects that require:
American Micro Industries fabricates polyester film into custom components based on customer drawings and specifications. Our team can help determine whether polyester film is the right material for your application and recommend the most appropriate fabrication method.
Fish paper and polyester film are both widely used for electrical insulation applications, but the right material depends on the specific needs of the finished component. Factors such as material thickness, moisture resistance, dimensional stability, fabrication requirements, and the operating environment should all be considered during the selection process.
At American Micro Industries, we help customers choose the electrical insulation material that best fits their application and manufacture custom components to their exact specifications. Whether your project requires fish paper, polyester film, or another speciality insulation material, our team can recommend the right solution and fabrication method for your production needs.
Contact American Micro Industries today to discuss your project and request a custom quote.
American Micro Industries supports clients across manufacturing, automotive, aerospace, military contracting, and other industries. From bulk electrical insulation and sound deadening materials to in-house CNC machining, die cutting, laser cutting, plastic machining, and more, our team can help you find the right solution for your project.
