How Tablet Hardness Testing Works: Step-by-Step Process in Pharmaceutical Testing

Table of Contents

• • How Tablet Hardness Testing Works
  • Step-by-Step Process of Tablet Hardness Testing
  • Visualize the Tablet Hardness Testing Process
  • What Happens During Force Application
  • Measurement and Data Recording in Hardness Testing
  • Factors That Influence Testing Accuracy
  • Common Errors in Tablet Hardness Testing 
  • Why Tablet Hardness Testing is Critical
  • Tablet Hardness Testing in Pharmaceutical Manufacturing
  • Related Product
  • Frequently Asked Questions
  • Key Takeaways

How Tablet Hardness Testing Works

Tablet hardness testing works by isolating a single tablet between a fixed anvil and a moving spindle.
A controlled compression force is applied until the tablet physically breaks.
The system records the peak breaking force required, displayed in Newton (N).

Step-by-Step Process of Tablet Hardness Testing

The process of tablet hardness testing follows a precise sequence. The steps of tablet hardness testing are reliable for accurate results.

• Placing the tablet: The tablet is placed horizontally between the jaws of the tablet hardness tester.
• Application of force: The tablet is subjected to increasing compression force.
• Breaking force detection: The exact breaking point of the tablet fracture point.
• Recording of data: The breaking force is recorded and displayed in digital test results.

Mini Summary: Tablet hardness testing works by applying a controlled force to a tablet until it breaks, measuring the required force in Newton (N).

Visualize the Tablet Hardness Testing Process

To illustrate the process, let’s consider the following:

• Compression: The motor moves the jaw forward, creating mechanical stress.
• Testing: The load cell transforms the mechanical stress into an electrical signal.
• Data: The microprocessor computes the force, which is the final tablet hardness measurement.

This linear workflow ensures every tablet meets the required mechanical strength of tablets.

What Happens During Force Application

As the force is applied, the load cell works as a transducer, converting the pressure from a physical form to a digital form. As the pressure increases, the tablet deforms elastically up to the tablet fracture point, where the internal structure of the tablet gives way to the pressure. This is the breaking force.

Measurement and Data Recording in Hardness Testing

Today, there are more complex devices than the traditional analog tablet hardness testers. Once the breaking force is registered, it can be shown on a digital display and even sent to a statistical control program. This allows the quality control laboratory analyst to keep track of any trends, ensuring that all pharmaceutical quality control measures are met.

Factors That Influence Testing Accuracy

Several variables need to be taken into consideration to accurately test tablet hardness measurement:

• Calibration: The device needs to be calibrated every day with a certified weight.
• Tablet Positioning – Incorrect positioning of the tablet can result in false results.
• Environmental Factors – The temperature and humidity can affect the tablet’s friability and breaking force.

Common Errors in Tablet Hardness Testing

However, there are common mistakes that should be avoided to maintain data integrity:

• Misalignment – The tablet should be placed in the centre of the platen to ensure even force application, which might yield false results in tablet breaking force.
• Inconsistent Pressure – Changing the speed of force application also affects the results.
• Operator Error – Failure to clean the area of debris before tablet placement might cause pre-loading.

Why Tablet Hardness Testing is Critical

Hardness testing of tablets is not negotiable because of cause and effect:

• Low Hardness: If the tablets are not hard, they will break, chip, or crumble during shipping.
• High Hardness: If the tablets are hard, dissolution problems will be experienced, meaning the drug might not be released in the body in time.

Proper tablet breaking force is essential in ensuring that the tablet is not broken during shipping, but dissolves in time for absorption.

Tablet Hardness Testing in Pharmaceutical Manufacturing

The tablet hardness tester is used throughout the production process:

• For in-process testing, the tester is often used during in-process testing in order to check the tablets.
• For final testing, the tester is used to verify the tablets’ hardness in order to ensure that the tablets conform to specifications during the final stages of production.

Related Product

Looking for a tablet hardness testing machine? Explore our precision pharmaceutical hardness tester units designed for accuracy and compliance.

Frequently Asked Questions

1. How does a tablet hardness tester work?

A tablet hardness tester functions by increasing the compression force on the tablet until it breaks. The unit of measurement for the breaking force is Newton (N).

2. How is tablet hardness measured?

How is tablet hardness measured? Tablet hardness is measured by diametrical compression with the aid of a tablet hardness tester. The unit of measurement is Newton (N) or kiloponds.

3. What is the unit of measurement?

The standard unit of measurement is Newton (N), Kilopond (Kp), or Strong-Cobb. The industry standard is Newton (N).

4. What is the difference between manual and automatic testers?

A manual tester uses a handwheel for the application of force, whereas an automatic tester uses a motorised drive for the application of force.

5. Can you test very small tablets?

Yes. Specialized anvils are used in modern testers to ensure the precise positioning of mini-tablets.

6. What happens if a tablet is too hard?

When the tablet breaking force is above the specifications, the tablet will fail the dissolution tests.

Key Takeaways

Tablet hardness testing is a very important quality control test for pharmaceutical products. It helps guarantee the quality of the products. In this test, a certain amount of force, known as compression force, is applied to the tablet until it reaches the fracture point, and the breaking force in Newton (N) units is determined. This helps guarantee that the tablet is hard enough for packaging but soft enough for dissolution