IEC 60695-10-2 Ball Pressure Test Apparatus

IEC 60695-10-2 Ball Pressure Test Apparatus

The Ball Pressure Test Apparatus is used to assess the ability of insulating materials to resist softening and deformation when subjected to both heat and mechanical pressure. The test is performed by placing the specimen horizontally on a steel support inside a temperature-controlled chamber and applying a 20 N load via a 5 mm steel ball.

After the specified heating period, the specimen is rapidly cooled in water, and the diameter of the indentation is measured. An indentation not exceeding 2 mm is typically considered acceptable. This Ball Pressure Test Apparatus provides a simple, repeatable, and standardized method for evaluating thermal stability of materials used in electrical products.

Technical Parameters

Testing Principle

The Ball Pressure Test Apparatus evaluates the thermal deformation resistance of insulating materials under combined heat and mechanical pressure. A 5 mm steel ball applies a constant 20 N vertical load to the horizontally positioned specimen inside a temperature-controlled heating chamber.

Under sustained heat, many insulating materials soften, allowing the steel ball to gradually sink into the surface and form a permanent indentation. After the specified test duration, the specimen is rapidly cooled in water to stabilize the deformation. The diameter of the resulting indentation is then measured within a short time window.

A smaller indentation diameter indicates better resistance to thermal softening. This test is particularly important for materials used in electrical products, as excessive deformation under abnormal heat can compromise insulation performance and mechanical integrity. The apparatus provides a standardized and repeatable method to assess this property in accordance with IEC 60695-10-2.

Common Error Mitigation

To achieve accurate and consistent test results, laboratories should follow these practices:

• Ensure the specimen surface is flat and in full contact with the support plate.
• Verify that the chamber temperature has fully stabilized before starting the test.
• Confirm the load is accurately set to 20 N ± 0.2 N and the ball is in good condition.
• Perform rapid cooling exactly as specified and measure the indentation diameter within the required time.
• Avoid any disturbance or movement of the specimen during the heating phase.

Applications and Use Cases

The Ball Pressure Test Apparatus is widely used by manufacturers, third-party testing laboratories, and quality control departments for heat resistance verification of non-metallic materials in electrical products.

Typical applications include:

• Heat resistance testing of insulating materials in plugs and sockets
• Thermal deformation evaluation of plastic components in household appliances
• Ball pressure testing for luminaires and lighting equipment
• Material verification for switches, appliance couplers, and electrical accessories
• Quality control of engineering plastics used in electrical and electronic products
• Pre-compliance testing before safety certification

Key Advantages

Constructed entirely from steel with electroplated surfaces, the apparatus offers excellent durability and resistance to corrosion, making it suitable for long-term use in demanding laboratory environments. The simple, robust structure requires no complex electronics or calibration procedures, reducing maintenance needs and ensuring stable performance over time.

Because the apparatus operates inside standard heating chambers, it integrates easily into existing laboratory setups without requiring additional specialized equipment. This flexibility, combined with its compliance with IEC 60695-10-2 and support for related standards such as IEC 60884-1, IEC 60335-1, and IEC 60598-1, makes it a practical and cost-effective choice for routine quality control, material verification, and pre-compliance testing.