ISO 9009:1991

Overview

ISO 9009:1991 is an International Standard developed by ISO Technical Committee ISO/TC 63, Sub-Committee SC 2, that specifies test methods for assessing critical dimensional features of glass containers. Specifically, it focuses on determining the height and non-parallelism of the container finish relative to its base. These features are essential quality parameters in glass container manufacturing because they influence container performance, compatibility with closures, and overall product safety.

This standard outlines the principles, required apparatus, sampling methods, detailed test procedures, result expression, and necessary test report content to ensure standardized and reliable testing. The test methods combine efficiency and precision by enabling simultaneous measurement of both height and non-parallelism using the same apparatus.

Key Topics

• Height Measurement
  Defined as the distance between the highest point of the container's finish (top surface) and the standing surface (base). Both maximum and minimum heights are determined to understand the container's dimensional range.

• Non-Parallelism Determination
  This refers to the difference between the maximum and minimum heights of the finish, indicating how parallel the container’s finish is relative to its base. Non-parallelism impacts sealing effectiveness and container stability.

• Test Apparatus
  The standard describes several types of gauges usable for these tests, including:

  • Height gauges with vertical pillars and fixed or adjustable horizontal cross-pieces
  • Window gauges combining body diameter and height measurement
  • Engineering height verniers and micrometer height gauges with at least 0.1 mm accuracy
  • Use of feeler gauges and spirit levels for qualitative assessments

• Sampling
  Sampling size and methods are to be agreed upon by relevant parties to ensure representative and reliable testing.

• Test Procedures
  Procedures cover:

  • Quick checks using GO/NO GO type gauges for attribute-based results
  • Precise height measurements utilizing appropriate instruments
  • Measurement of non-parallelism by recording maximum and minimum finish heights with high accuracy

• Result Expression
  Results can be expressed as attribute compliance (number of containers meeting tolerances) or as precise dimensional measurements in millimeters.

• Test Reporting
  Essential report information includes:

  • Standard reference
  • Test method used
  • Sample size and container type
  • Manufacturing details
  • Apparatus used
  • Test results
  • Tester’s identity and test date

Applications

ISO 9009:1991 test methods are crucial in quality assurance for manufacturers of glass containers used in diverse sectors such as:

• Food and beverage packaging
• Pharmaceutical and cosmetic containers
• Industrial and chemical glassware

Ensuring accurate height and parallelism of container finishes helps guarantee:

• Proper sealing and closure compatibility
• Mechanical stability during handling and transport
• Compliance with international quality and safety requirements

This standard supports manufacturers and quality control labs in maintaining consistent production quality and reducing product defects related to dimensional variances.

Related Standards

• ISO 7348:1991 - Glass containers - Manufacture - Vocabulary; provides definitions referenced in ISO 9009 and other glass packaging standards.

• Additional ISO standards within the ISO/TC 63 committee focus on various aspects of glass container manufacturing, testing, and quality criteria, complementing the dimensional measurement methods in ISO 9009.

Keywords: ISO 9009, glass containers, height measurement, non-parallelism, finish dimension, test methods, quality assurance, glass packaging, measurement apparatus, container base, ISO standards, dimensional testing, glass container quality, manufacturing standards