Insulation tubes used in electrical equipment need to provide reliable electrical insulation while maintaining sufficient mechanical strength and dimensional stability during service. PFCP 21 Phenolic Paper Tube is a thermosetting phenolic paper laminated tube developed for mechanical and low-voltage electrical insulation applications.

It is manufactured from insulating paper impregnated with phenolic resin and formed through a controlled hot winding and curing process. This structure combines the electrical properties of the resin system with the mechanical support provided by the laminated paper layers.

For applications such as transformers, motors and other electrical equipment, the material can be used as an insulating structural component or support part. Its moisture resistance also makes it suitable for environments where stable insulation performance is required under humid conditions.

What Is PFCP 21 Phenolic Paper Tube?

PFCP 21 Phenolic Paper Tube is a phenolic paper laminated insulation tube manufactured by combining insulating winding paper with phenolic resin.

During production, the insulating paper is impregnated with phenolic resin and wound into the required tubular structure. The material is then subjected to heating and curing to form a rigid thermoset laminate.

The laminated structure gives the tube a combination of mechanical and electrical properties, making it suitable for use as an insulating structural component rather than simply as a flexible electrical insulation material.

Material and Manufacturing Process

The basic material structure consists of insulating paper and phenolic resin. The paper provides the reinforcement framework, while the cured phenolic resin acts as the bonding matrix.

The hot winding and curing process is important because uniform resin impregnation and proper consolidation of the paper layers directly affect the consistency of the finished tube.

For insulation components, stable manufacturing conditions are particularly important because defects or uneven resin distribution can influence both mechanical strength and electrical insulation performance.

Key Properties of PFCP 21 Phenolic Paper Tube

The performance requirements of an insulation tube depend on the application. For PFCP 21, several properties are particularly relevant.

Thermal Performance

PFCP 21 is generally classified as a Class E insulating material. This makes it suitable for electrical equipment operating under moderate temperature conditions within the applicable insulation system.

The actual allowable operating temperature should be determined according to the complete electrical insulation system, operating conditions and relevant technical requirements rather than relying only on the material class.

Electrical Insulation Performance

The material provides suitable electrical insulation properties for mechanical and low-voltage electrical applications.

Its electrical performance is one of the main reasons phenolic paper laminated tubes are used in electrical equipment. When the tube is incorporated into an electrical assembly, the required dielectric strength, insulation resistance and other electrical parameters should be evaluated according to the specific application.

Mechanical Properties

In addition to electrical insulation, the tube provides mechanical support for insulating structures. Its rigid laminated construction allows it to be used as a structural insulation component in equipment where the material is exposed to mechanical loads.

The required mechanical properties should always be evaluated together with temperature, dimensions, wall thickness and the actual loading conditions.

Moisture Resistance

One of the important characteristics of PFCP 21 Phenolic Paper Tube is its good moisture resistance.

For equipment operating in humid environments, moisture can affect the electrical performance of insulating materials. Therefore, moisture resistance should be considered when selecting an insulation tube for equipment exposed to high humidity or changing environmental conditions.

Applications of PFCP 21 Phenolic Paper Tube

PFCP 21 Phenolic Paper Tube is mainly used for mechanical and low-voltage electrical applications.

Transformer Applications

The tube can be used as an insulating structural component in transformers and related electrical equipment. It can also be used as a support or insulation component where the application requires a rigid tubular structure.

Phenolic paper laminated materials can also be used in transformer oil environments when the specific material specification and application conditions are suitable.

Motor and Electrical Equipment

The material can be used in motors and other electrical equipment as an insulating structural component. Its combination of mechanical support and electrical insulation makes it suitable for components where both functions are required.

Mechanical Insulation Components

Beyond electrical equipment, PFCP 21 Phenolic Paper Tube can be used for mechanical insulating components where a rigid, machinable and electrically insulating tubular material is required.

The final selection should consider the required dimensions, mechanical load, electrical conditions, temperature and surrounding environment.

Why Material Selection Matters

Different laminated insulation tubes use different reinforcement materials and resin systems. Therefore, they should not be selected simply according to appearance or basic dimensions.

Phenolic paper tubes, phenolic cotton tubes and epoxy glass fabric tubes have different performance characteristics and are intended for different operating conditions.

Consider the Operating Temperature

The first step is to determine the normal and maximum operating temperatures of the equipment. The material's thermal class should then be checked against the requirements of the complete insulation system.

Consider the Electrical Requirements

For electrical applications, the required insulation voltage, dielectric performance and insulation resistance should be defined before selecting the material.

Where higher electrical performance is required, another laminated material grade may be more appropriate.

Consider Humidity and Working Environment

If the component will operate in a humid environment, moisture resistance should be included in the material evaluation. The surrounding components, coatings and adhesives should also be considered because the performance of the complete insulation system depends on more than the tube alone.

Dimensions and Machining

PFCP 21 Phenolic Paper Tube can be supplied in tubular form for further processing according to the customer's requirements.

Before ordering, customers should specify the required inner diameter, outer diameter, length and dimensional tolerances. For machined components, additional requirements such as drilling, turning, cutting or other CNC operations should be confirmed in advance.

Proper machining parameters are important because excessive cutting heat, unsuitable tools or excessive mechanical force may affect the finished component.

Yilong PFCP 21 Phenolic Paper Tube

Yilong INSULATION manufactures phenolic paper laminated tubes for mechanical and low-voltage electrical insulation applications. The PFCP 21 grade is based on insulating paper and phenolic resin and is designed for applications requiring a combination of electrical insulation, mechanical support and moisture resistance.

Yilong can also evaluate customized tube dimensions and machining requirements according to customer drawings and application conditions.

When requesting PFCP 21 Phenolic Paper Tube, customers are recommended to provide the required inner diameter, outer diameter, length, tolerance, operating temperature and application. This allows Yilong's technical team to confirm the appropriate material specification and processing requirements.

For technical information, quotations or customized insulation tubes, please contact Yilong
www.Yilonginsulation.com, Yilong@Yilonginsulation.com, WhatsApp: +86 15866869385