How To Identify Bad Casing Pipes?

‌In many engineering and electrical application scenarios, the quality of casing pipe is crucial, and it is related to whether the system can operate safely and stably. Faced with the uneven quality of casing pipe products on the market, how to distinguish the good from the bad? The methods for identifying bad casing pipes mainly include the following aspects:

‌Observe the appearance‌

1. Color and texture

The color of good casing pipes is soft and bright and has an oily texture, while the color of bad casing pipes is unnatural, the cut section is dry and has no oily texture, and may be mixed with inferior plastic or impurities.

‌2. Surface state‌

The appearance of high-quality casing pipes is flat and smooth, without wrinkles, cracks, bubbles and other defects, while the surface of bad products is uneven, with tumor-like marks or impurities.

‌3. Weaving process‌

For casing pipes woven with glass fiber or polyester fiber, high-quality casing pipes are neatly woven and have uniform colors, while bad products are loosely woven and have incorrect colors.

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Testing physical properties‌

1. Weight and thickness

High-quality casing pipe is usually heavier than defective products because its material is purer. Defective products may make up for the lack of quality by increasing thickness, but the weight is still relatively light.

‌2. Dimensional accuracy

Use tools such as vernier calipers to test the length, inner diameter, wall thickness, outer diameter and other dimensions of the casing pipe. Defective products may have large dimensional deviations, affecting the use effect.

‌3. Tensile strength‌

Test the tensile strength of the casing pipe through a tensile test. Defective products may have insufficient tensile strength due to poor materials or production process problems.

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Combustion test‌

1. Combustion phenomenon‌

When burning, high-quality casing pipe only releases carbon dioxide and water vapor, without odor and residue; while defective products may produce odor and residue due to mixing with inferior plastics or other impurities.

‌2. Combustion temperature‌

High-quality casing pipe has high temperature resistance and can maintain stable performance at high temperatures; defective products may not meet the temperature resistance standards and are easily deformed or damaged at high temperatures.

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Check certification and reports‌

1. Product certification

Ask the supplier whether it provides product certification certificates, such as UL certification, CE certification, etc. These certifications can prove that the product meets certain safety standards and performance requirements.

‌2. Test report

Ask the supplier to provide product test reports, including test results of key parameters such as insulation performance, withstand voltage, and dielectric strength. These parameters can reflect the quality level of the bushing.

Choose formal channels and brands‌

‌1. Formal channels‌

Choose formal channels to purchase bushings, such as professional electrical material markets, well-known e-commerce platforms, etc. These channels usually have strict control and supervision over product quality.

‌2. Well-known brands

Give priority to bushings produced by well-known brands. Well-known brands usually focus on product quality and after-sales service, and can provide more reliable product guarantees.

Summary

In short, it takes a multi-pronged approach to identify bad casing pipes: in terms of appearance, look at the color texture, surface state and weaving process; physical property testing covers weight, dimensional accuracy, and tensile strength; combustion tests pay attention to combustion phenomena and temperature resistance; at the same time, check the certification report, choose regular channels and well-known brands, and make comprehensive judgments to choose high-quality casing pipes.