Operation & Calibration of Melting Point Apparatus

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STANDARD OPERATING PROCEDURE (SOP)

Operation & Calibration of Melting Point Apparatus

1. Objective

To establish a standardized and regulatory-compliant procedure for the operation, calibration, and performance verification of the melting point apparatus in order to ensure accurate, reliable, and reproducible results.

2. Scope

This SOP applies to all analytical and quality control laboratories involved in melting point determination of pharmaceutical raw materials, intermediates, and finished products.

3. Regulatory & Reference Standards

  • USP <741> – Melting Range or Temperature
  • Ph. Eur. 2.2.14 – Melting Point
  • Indian Pharmacopoeia – Melting Point
  • ICH Q2(R1) – Validation of Analytical Procedures
  • WHO GMP Guidelines
  • ISO/IEC 17025
  • Instrument Manufacturer’s Manual

4. Responsibilities

  • Analyst / Operator: Execute procedure and record data
  • Supervisor: Review and approve results
  • Quality Assurance: Ensure SOP compliance

5. Safety & GMP Precautions

  • Operate equipment only after proper training
  • Avoid contact with heated surfaces
  • Use clean, dry capillary tubes
  • Follow GMP and laboratory safety guidelines

6. Operating Procedure

6.1 Instrument Preparation

  1. Place the apparatus on a stable, level surface.
  2. Switch ON and allow 10–15 minutes warm-up.
  3. Verify display and optical clarity.

6.2 Sample Preparation

  1. Dry sample if required.
  2. Finely powder the sample.
  3. Fill 2–3 mm of sample in capillary tube.
  4. Tap gently for uniform packing.

6.3 Melting Point Determination

  1. Insert capillary tube into heating block.
  2. Set heating rate to ≤ 1°C/min near expected MP.
  3. Observe start and completion of melting.
  4. Record melting range.

7. Calibration Procedure

7.1 Calibration Frequency

  • Before initial use
  • After maintenance
  • At least once every 6 months

7.2 Reference Standards

  • Acetanilide
  • Benzoic Acid
  • Vanillin

7.3 Acceptance Criteria

Observed melting point must be within ±1.0°C of certified value.

8. Documentation

All observations shall be recorded in laboratory logbooks in compliance with ALCOA+ principles and reviewed by authorized personnel.

9. Revision History

Version Effective Date Description Approved By
1.0 — Initial Issue QA

© SOPNest | Quality Control Documentation

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