The Diameter Test measures the diameter of tablets to ensure uniformity.
Test Objective:
To determine the diameter of tablets.
Test Apparatus:
1. Vernier Caliper
2. Micrometer
3. Tablet Diameter Gauge
Test Procedure:
1. Select a random sample of tablets.
2. Measure the diameter of each tablet at its widest point.
3. Record the measurements.
Acceptance Criteria:
1. Mean diameter: within ± 5% of target value (USP)
2. Individual tablet diameter: within ± 10% of mean diameter (Ph. Eur.)
Factors Affecting Diameter:
1. Tablet shape and design
2. Punch diameter and wear
3. Compression force
4. Moisture content
5. Storage conditions
Regulatory Guidelines:
1. USP <685> “Uniformity of Dosage Units”
2. Ph. Eur. 2.9.5 “Control of Dosage Forms”
3. ICH Q6A “Specifications: Test Procedures and Acceptance Criteria”
Importance:
1. Ensures tablet uniformity.
2. Affects tablet hardness and friability.
3. Impacts patient compliance.
Troubleshooting:
1. Variable diameter: adjust punch diameter or compression force.
2. Out-of-specification diameter: check manufacturing process.
Tablet Diameter Tolerances:
1. Round tablets: ± 5% of target diameter
2. Oval tablets: ± 10% of target diameter
3. Capsules: ± 10% of target diameter
Alternative Methods:
1. Image Analysis
2. Laser Micrometer
3. Optical Measurement Systems
By conducting the Diameter Test, manufacturers ensure tablets meet quality standards.
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