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Home > About us > Plastic Bearing Columns > Corrosion Test on Bearings

Corrosion Test on Bearings

The photos below show the changes observed when metal bearings and plastic bearings were immersed in salt water or chemicals.
Each bearing was placed in the liquid for 3 minutes, 6 hours, and 24 hours, and the results were compared.

For the plastic bearings, we used materials suited to each liquid: salt water, acid, and alkali.

1. Salt Water

Salt water corrosion test

2. Chemicals (Acid & Alkali)

Chemical corrosion test

In both cases, there was little change after just a few minutes. However, over time, the metal bearings began to show signs of rust, and after 24 hours they were completely corroded and unusable.
In contrast, the plastic bearings showed no change after 24 hours. Even after continuing the test for another 24 hours — a total of 48 hours — no changes were observed.

Below is a comparison after 24 hours.
(The deposits seen on the plastic bearings are crystals left behind after the liquid evaporated.)

● Metal Bearings

Metal bearing after salt water exposure
Salt Water
Metal bearing after acid exposure
Acidic Cleaning Agent
Metal bearing after alkali exposure
Alkaline Cleaning Agent

● Plastic Bearings

Plastic bearing after salt water exposure
Salt Water
Plastic bearing after acid exposure
Acidic Cleaning Agent
Plastic bearing after alkali exposure
Alkaline Cleaning Agent

Even if you already understand the difference in corrosion resistance, seeing it visually after just 24 hours has a much greater impact.

As shown, in environments such as underwater or in chemical solutions — where metal bearings cannot be used — plastic bearings remain free from corrosion and can be used for a long service life.

If you can provide details about your operating environment and the chemicals involved, we can recommend the most suitable material.

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  • Plastic Bearing Columns
    • Plastics and Electrical Properties (Insulation, Antistatic, Conductivity)
    • Characteristics of PE (Polyethylene)
    • Corrosion Test on Bearings
    • What Are Angular Contact Ball Bearings?
    • Dimensional Changes in Plastics and Processing Methods
    • The Role of Fillers in Plastic Bearings
    • Glass Transition Temperature in Plastics
    • Heat Deflection Temperature (HDT) in Plastics
    • Melting Point and Heat Resistance of Plastics
    • Types of Plastics Based on Tensile, Compressive, and Flexural Strength
    • Thermal Expansion in Plastics
    • Water Absorption in Plastics
    • What Is Weather Resistance in Plastics?
    • What is “Creep” in Plastics?
    • Ball Bearing Precision Grades
    • Friction Coefficient of Plastic Bearings
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