Glassware Management and Cleaning in Quality Control Laboratory

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STANDARD OPERATING PROCEDURE (SOP)

Glassware Management and Cleaning in Quality Control Laboratory

SOP No. QC/SOP/___ Effective Date ___
Revision No. 00 Department Quality Control

1. Purpose

To establish a controlled, validated, and step-by-step procedure for receipt, use, cleaning, detergent selection, inspection, and storage of laboratory glassware to prevent contamination, cross-contamination, and analytical errors in compliance with GMP, WHO, FDA, and EU-GMP requirements.

2. Scope

This SOP applies to all reusable laboratory glassware used for analytical testing including volumetric flasks, pipettes, burettes, beakers, conical flasks, test tubes, chromatographic glassware, and other analytical glass items.

3. Regulatory References

  • WHO GMP – Laboratory Control
  • FDA 21 CFR Part 211.67 – Equipment Cleaning and Maintenance
  • EU GMP Part I – Chapter 3
  • ICH Q7 – Cleaning and Maintenance

4. Definitions

Laboratory Detergent: A non-reactive, non-ionic or mildly alkaline cleaning agent specifically designed for laboratory glassware and validated for residue-free cleaning.

5. Responsibilities

  • QC Head: Approval of detergent, procedure, and compliance.
  • QC Supervisor: Monitoring cleaning practices and detergent preparation.
  • Analyst: Proper cleaning, detergent use, and inspection.
  • Quality Assurance: Oversight, compliance verification, and audits.

6. Detailed Step-by-Step Procedure

6.1 Selection and Approval of Detergent

Only laboratory-grade detergents approved by Quality Assurance shall be used. Detergents shall be non-ionic or low-foaming, free from perfumes, dyes, and reactive substances. Examples include commercially available laboratory detergents such as neutral or mildly alkaline glassware cleaners.

6.2 Detergent Concentration (Regulatory-Compliant Examples)

Detergent concentration shall be defined, validated, and controlled. The following concentrations are commonly accepted and shall be used unless otherwise justified:

  • Routine analytical glassware: 1.0 – 2.0 % v/v detergent solution
  • Heavily soiled glassware: 2.0 – 5.0 % v/v detergent solution
  • Chromatography glassware: 1.0 – 2.0 % v/v detergent solution (low-residue detergent)

Any change in detergent type or concentration shall be evaluated and approved through change control and revalidated if required.

6.3 Preparation of Detergent Solution

The required quantity of detergent shall be measured accurately and diluted with potable water to obtain the specified concentration. The solution shall be freshly prepared daily or as defined, labeled with detergent name, concentration, preparation date, and prepared by details.

6.4 Segregation of Used Glassware

Used glassware shall be collected immediately after use in designated containers labeled “Used Glassware”. Glassware shall not be allowed to dry with residues.

6.5 Pre-Rinsing

Glassware shall be pre-rinsed with potable water immediately after use to remove bulk residues prior to detergent washing.

6.6 Cleaning Using Detergent

Glassware shall be immersed or washed using the approved detergent solution. Appropriate brushes shall be used where required. Soaking time shall typically be 10–30 minutes depending on contamination. Excessive soaking shall be avoided.

6.7 Rinsing Procedure

After detergent washing, glassware shall be rinsed thoroughly with potable water until all detergent residues are removed. Final rinsing shall be performed using purified water or distilled water to eliminate ionic or detergent traces.

6.8 Drying of Glassware

Glassware shall be air-dried on clean racks or dried in a hot air oven at 60–80°C. Internal wiping is strictly prohibited to prevent fiber contamination.

6.9 Inspection of Cleaned Glassware

Each item shall be visually inspected against light for cleanliness, stains, detergent residue, water spots, cracks, or damage.

6.10 Acceptance Criteria for Clean Glassware

  • No visible residue, stains, or particulate matter
  • No detergent foam, odor, or slippery surface
  • Uniform water film drainage without beading
  • No cracks, chips, or defects

6.11 Storage of Clean Glassware

Clean glassware shall be stored in clean, closed cupboards or racks protected from dust. Volumetric glassware shall be stored upright or inverted as appropriate.

6.12 Handling of Non-Conforming Glassware

Glassware failing acceptance criteria shall be re-cleaned. Damaged glassware shall be segregated, labeled, and discarded as per laboratory safety procedures.

7. Documentation and Records

  • Glassware cleaning log
  • Detergent preparation record
  • Training records
  • Deviation / breakage records

8. Compliance and Data Integrity

All records shall comply with Good Documentation Practices and ALCOA+ principles. Detergent concentration, preparation, and usage records shall be accurate, traceable, and contemporaneous.

9. Revision History

Revision Date Change Description
00 ___ Initial Issue

*** END OF SOP ***

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