Large Tablet and Bolus Hardness Tester

What is the Large Tablet and Bolus Hardness Tester?

A large tablet and bolus hardness tester extends the force range to 500–1000 N and the jaw opening to over 50 mm for veterinary boluses, effervescent tablets, chewables and compressed nutritional tablets. It is used when standard testers lack the force or gap.

Overview

Veterinary boluses, large effervescent tablets and industrial compressed tablets may exceed 30 mm in diameter and require forces above 500 N, so standard testers may overload or cannot accommodate the specimen. This tester has a stronger frame, a high-capacity load cell of 1000 N, or up to 2000 N in some models, and a jaw opening of about 60 mm. A motor-driven jaw applies force at a programmable speed of typically 0.5–2 mm/s, and large flat platens or V-blocks hold the tablet. Breaking force and, optionally, thickness are displayed digitally. Overload protection guards the load cell, and a shield contains fragments that can be large. Calibration is checked over the expanded range, with verification points at 20, 50 and 100% of capacity. The machine is also used for hardness testing of salt tablets, detergent tablets and other compressed products outside pharmaceutical dosage forms.

How does it work?

A hardness tester compresses a tablet diametrically between a stationary anvil and a moving jaw while a load cell records force. Force rises until the tablet fractures, and the peak value is reported as breaking force in newtons (or kgf, SCU). Manual designs use a spring or screw; motorized testers drive the jaw at a constant rate of typically 0.5–3 mm/s for operator-independent results. Multi-parameter testers add a displacement sensor to measure thickness and diameter, and some add a balance for weight. Tensile strength for flat round tablets equals 2F/(πDH), which normalizes hardness for size. Hardness depends on compression force, binder, moisture content and tablet geometry. The load cell is calibrated against traceable force standards per ISO 7500-1, and the loading rate and tablet orientation must be fixed in the method to ensure comparability.

What are the key features?

• Load cell capacity of 1000 N with overload protection
• Jaw opening of about 60 mm for large specimens
• Motor-driven constant speed of 0.5–2 mm/s
• Flat platens and V-blocks for boluses and tablets
• Reinforced shield for large fragments
• Calibration verification at 20, 50 and 100% of capacity

What are the technical specifications?

A typical large tablet and bolus hardness tester configuration offers measuring range of 0–1000 N (up to 2000 N optional), resolution of 0.5 N, accuracy of ±1% of reading, jaw opening of up to 60 mm, jaw speed of 0.5–2 mm/s and specimen diameter of up to 55 mm. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Large Tablet and Bolus Hardness Tester is used in veterinary boluses, effervescent tablets, chewable and nutritional tablets and industrial compressed tablets. Across the wider Hardness Testers class, laboratories also deploy it for tablet compression control, QC release testing and formulation development.

Which standards and certifications apply?

Relevant standards and methods include USP <1217>, Ph. Eur. 2.9.8, USP <1216>, ISO 7500-1, ASTM E4, ChP 0931 and USP <905>. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the tester on a stable bench away from vibration. Verify force with traceable weights or a reference load cell at installation and at least annually, plus after overload events. Clean anvils and jaws to remove powder that can affect contact, and inspect them for wear. Use consistent tablet orientation and loading speed, test at least ten tablets, and allow tablets to equilibrate to room temperature and humidity. Record units clearly, because kgf and N are both used. For regulated laboratories, include the tester in IQ/OQ and calibration schedules and maintain audit-trail records for electronic data.

How do I select the right Large Tablet and Bolus Hardness Tester?

Select this model when tablets exceed about 30 mm diameter, need more than 500 N, or are irregularly shaped boluses. Specify the maximum force, specimen dimensions, fixtures, and display units. Standard pharmaceutical tablets are better served by a 500 N motorized tester, which has finer resolution.

How does it compare with other Hardness Testers variants?

Decide first whether you need manual spot checks or repeatable QC data. Manual testers suit press set-up and teaching; motorized digital testers suit release and validation work with constant loading speed and records. Choose a multi-parameter tester when thickness, diameter, weight and tensile strength are also required, and an automated system for high sample volume or press integration. For boluses and large tablets specify a 1000 N or greater capacity. Key parameters are force range, resolution (0.1 N for small tablets), accuracy, loading speed, tablet diameter range, statistics, data output and compatibility with 21 CFR Part 11 if regulated. Verify that the supplier provides force calibration certificates traceable to national standards.