ISO 6706:1981

Overview

ISO 6706:1981 establishes the international requirements for plastic graduated measuring cylinders used as laboratory ware. Developed by the International Organization for Standardization (ISO), this standard applies to cylinders made from translucent or transparent plastics, featuring a graduated volumetric scale and a pouring spout. It defines the nominal capacities, dimensions, construction qualities, as well as performance characteristics such as accuracy, stability, and resistance to chemical extraction. The standard also includes testing methods for evaluating the extraction of ionic materials and assessing flexibility and recovery properties to ensure reliable volume measurement in laboratory settings.

Key Topics

• Range of Capacities: The standard outlines a series of nominal capacities for plastic measuring cylinders, ensuring selection according to laboratory volume requirements. Series include widely used volumes (e.g., 10 ml, 25 ml, 50 ml, up to 4000 ml).
• Graduation and Scale: Detailed specifications for graduated markings such as minimum division, maximum permitted error, clarity, and placement are provided to guarantee measurement accuracy.
• Material Requirements: Cylinders must be manufactured from non-brittle, chemically and thermally suitable plastics, free from defects and stress.
• Construction and Stability: The base must provide stability to prevent tipping, and spouts should enable controlled pouring. Wall thickness and translucency are detailed for optimal use and visibility.
• Testing Protocols: Standardized tests are included for:
  • Accuracy of graduation
  • Extraction of ionic material using de-ionized water
  • Flexibility and recovery, assessing how the cylinder withstands and recovers from applied mechanical stress
• Markings and Inscriptions: Clear, durable inscriptions on each cylinder must indicate volume unit, temperature of calibration, manufacturer or vendor, material type, and relevant standard reference.

Applications

ISO 6706:1981 is highly relevant in areas where precise volumetric measurement of liquids is integral to laboratory work, especially when plastic laboratory ware is preferable due to durability, chemical resistance, or safety over glass alternatives:

• Chemical analysis and titration procedures requiring accurate liquid measurement
• Biological and medical laboratories for preparing and diluting solutions
• Pharmaceuticals during formulation, testing, and quality control
• Educational settings where robust, break-resistant laboratory ware is needed
• Industrial and research laboratories utilizing plastic graduated cylinders for sample handling, mixing, and measurement

By adhering to ISO 6706:1981, organizations can ensure consistency, traceability, and safety when utilizing plastic measuring cylinders, meeting global compatibility and regulatory expectations.

Related Standards

ISO 6706:1981 references and aligns with other important standards to ensure comprehensive laboratory practice:

• ISO 384: Laboratory glassware - Principles of design and construction of volumetric glassware
• ISO 649-2: Laboratory glassware - Density hydrometers for general purposes - Test methods and use
• IEC 335/1: Safety of household and similar electrical appliances - General requirements

These standards collectively support quality, precision, and safety in laboratory measurements, emphasizing the value of adopting ISO 6706:1981 for organizations utilizing plastic laboratory measuring cylinders.

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