Aramid Paper Brief Introduction

Bannor Aramid Paper is a special paper made from pure aramid fibers, which has high strength, low deformation, high temperature resistance, chemical corrosion resistance, radiation resistance, flame retardancy, and excellent electrical insulation properties. It is widely used in various fields such as electric power, aerospace, rail transit, new energy vehicles, electronic communications, and other fields.

Aramid Paper Technical Data

Aramid Paper offers excellent dielectric strength, mechanical properties, flexibility and resilience. There are 9 thicknesses, from 2 mil to 30 mil (0.05mm to 0.76mm). Aramid Paper is used in almost every known electrical sheet insulation applications. High temperature resistance Aramid Paper can  offer short-term overloading.

Electrical Properties

The electrical strength

Dielectric strength refers to the measurement of the electrical strength of a material when it acts as an insulator. The following table reflects the instantaneous maximum electric field strength that aramid paper can withstand under 50Hz AC rapid voltage boost conditions.

Effect of Temperature on Electrical Performance

The figure below shows the effect of temperature on the dielectric properties of aramid paper (taking 0.08mm, 3mil as an example). It can be seen from the figure that the effect of temperature on the dielectric strength, dielectric constant, dielectric loss and resistivity of aramid paper is very low.

Effect of Humidity on Electrical Performance

The following table shows the effect of humidity on the dielectric properties of aramid paper. As can be seen from the table, humidity (moisture) has relatively little impact on the dielectric strength, dielectric constant, dielectric loss and resistivity of aramid paper.

Mechanical Properties

Aramid paper has a dense structure, smooth surface, good dimensional stability, and outstanding mechanical properties. The table below shows typical mechanical property values of aramid paper.

Effect of Temperature and Humidity on Mechanical Properties

The figures below reflect the effects of temperature and humidity on the mechanical properties of aramid paper respectively. It can be seen from the figure that the influence trends of the two factors are relatively similar, the elongation shows an upward trend, and the tensile strength decreases slightly, indicating that aramid paper can maintain good mechanical strength under high, low, and high humidity conditions. It is recommended to keep the product sealed before use to prevent the influence of moisture.

Terminal Property

Terminal property is an important property  of aramid paper. it represents the work ability  of long-time exposure of paper to high  temperature. Bannor aramid paper is confirmed as  210℃ insulation by UL, and also confirmed by  many years’ application.

Chemical Stability

Bannor aramid paper has excellent chemical stability and compatibility. Because its molecular structure is extremely stable, it is resistant to acid and alkali corrosion and is basically not affected by commonly used industrial solvents, as shown in the figure. Aramid paper and its laminate products are fully compatible with all types of electrical varnishes, adhesives, transformer oils, lubricants and refrigerants.

The limiting oxygen index (LOI) of Bannor aramid paper is ≥28%. It does not melt in the air and does not support combustion. The surface is carbonized to form an insulating protective layer at high temperatures. This product has obtained UL94 VTM-0 and V-0 certification. In addition, Bannor aramid paper's resistance to α, β, and γ ray radiation is very significant, which allows it to be used in key control equipment of high-radiation devices.