Rockwell Hardness Test

What is the Rockwell Hardness Test (ASTM D785)?

The Rockwell Hardness Test measures the resistance of a plastic material to indentation. Unlike other hardness tests, Rockwell hardness testing determines the depth of penetration under a specified load, making it a preferred choice for evaluating rigid and semi-rigid plastics. The ASTM D785 standard outlines the test method for plastics, ensuring accuracy and consistency in hardness measurement.

Rockwell Hardness Test Procedure (ASTM D785)

The test involves the following steps:

1. Specimen Preparation

   • A flat, smooth plastic sample is prepared as per ASTM D785 specifications.
   • The sample must be free from surface defects for accurate results.

2. Indentation Process

   • A steel ball or a tungsten carbide ball indenter is used.
   • The test applies a minor load (10 kgf) followed by a major load (60 kgf, 100 kgf, or 150 kgf) depending on the Rockwell scale used.

3. Measurement of Hardness Value

   • The depth of penetration under the major load is measured after a specific dwell time.
   • The Rockwell hardness value is displayed on the testing machine.

4. Result Interpretation

   • The final hardness value is reported on the respective Rockwell scale (e.g., M or R scales for plastics).
   • Higher values indicate harder materials, while lower values suggest softer plastics.

Benefits of Rockwell Hardness Testing for Plastics

• Quick and Non-Destructive – The test provides instant results without damaging the sample.
• Applicable to a Wide Range of Plastics – Suitable for both rigid and semi-rigid plastics.
• Standardized & Reliable – ASTM D785 ensures consistent hardness evaluation across industries.
• Helps in Quality Control – Used for material selection, product validation, and process optimization.

Industrial Applications of Rockwell Hardness Testing

• Automotive Industry – Hardness testing of plastic components like dashboards, trims, and panels.
• Electronics & Electricals – Ensuring the durability of plastic casings and insulation materials.
• Aerospace & Defense – Evaluating polymer-based structural and non-structural materials.
• Medical Devices – Testing hardness for plastic medical equipment and enclosures.
• Consumer Goods & Packaging – Ensuring the strength and longevity of plastic products.

Rockwell Hardness Testing in Chennai – Why Choose Kiyo R&D Center & Laboratory?

Kiyo R&D Center & Laboratory offers Rockwell hardness testing in Chennai, providing:

✔ State-of-the-art equipment for precise ASTM D785 hardness measurements.
✔ Expert technicians ensuring accurate testing and result interpretation.
✔ Comprehensive material testing services for plastics and polymers.
✔ Quick turnaround times to meet industrial and research needs.