Overview
ISO 7713:1985 is an international standard issued by the International Organization for Standardization (ISO) that specifies requirements for disposable serological pipettes used in laboratory settings. These pipettes, made of glass and intended for single use, are designed to deliver precise volumes of liquid, including both flow-out and blow-out types. The standard addresses key aspects such as pipette construction, dimensions, volumetric accuracy, repeatability, and marking to ensure consistent and reliable performance during their original operation.
The focus of ISO 7713:1985 is to provide practical guidance for manufacturers and laboratories regarding the quality and functionality of disposable serological pipettes, supporting their use in general laboratory applications where precise liquid measurement is critical.
Key Topics
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Scope and Application
ISO 7713 covers disposable glass serological pipettes used for accurate liquid delivery in laboratory environments. It includes both flow-out pipettes, where liquid flows freely from the tip, and blow-out pipettes, where the last drop is expelled by blowing, ensuring full delivery.
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Materials and Construction
Pipettes must be made from high-quality glass compliant with hydrolytic resistance standards (ISO 719) to withstand laboratory conditions. They need to be free from visible defects and internal stress, with smooth, tapered tips suitable for plugging or filtering. The pipette dimensions and gradations are strictly defined to ensure standardized performance.
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Volumetric Performance
The standard defines how to measure accuracy (closeness of mean volume to nominal volume) and repeatability (closeness of individual volume measurements), critical for laboratory precision. Testing is performed at a reference temperature of 20 °C with distilled water. Methods for calculating volume deviation and coefficients of variation are detailed.
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Dimensions and Delivery Times
Pipette nominal capacities, graduations, external diameters, and expected delivery times are standardized, allowing users to anticipate and compare performance. The length of the tapered portion and wall thickness also have defined ranges depending on capacity.
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Marking and Labelling
Each pipette and its packaging must include specific markings such as manufacturer name or trademark, nominal capacity, "Ex" symbol, reference temperature (20 °C), and identification of whether it is a blow-out pipette (marked by a white enamelled band). Packages should also include product description, volumetric performance data, lot number or date, and the ISO standard number for traceability.
Applications
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General Laboratory Use
Disposable serological pipettes complying with ISO 7713 are essential in medical, biochemical, and chemical laboratories for measuring and transferring liquids with defined accuracy and reliability.
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Clinical and Diagnostic Testing
Their single-use nature reduces contamination risk, making them ideal for clinical environments where sterility is vital.
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Research and Quality Control
Accuracy and repeatability standards ensure they are suitable for research experiments and quality control processes requiring precise volumetric measurements.
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Educational Laboratories
Provision of standardized disposable pipettes supports consistent training and experimentation within teaching laboratories.
Related Standards
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ISO 8417: Disposable Volumetric Articles
Establishes principles of design and construction for disposable laboratory volumetric instruments, providing foundational requirements related to ISO 7713.
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ISO 719: Hydrolytic Resistance of Glass
Specifies test methods and classification of glass resistance to hydrolysis, relevant for glass quality in pipette manufacture.
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ISO 1769: Pipette Colour Coding
Defines color coding for laboratory pipettes, assisting in easy identification of nominal capacities and types conforming to ISO 7713.
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ISO 3534: Statistics Vocabulary
Provides statistical terminology used to define and measure accuracy and repeatability referenced in ISO 7713.
Keywords: ISO 7713, disposable serological pipettes, laboratory glassware, volumetric accuracy, repeatability, pipette standards, flow-out pipettes, blow-out pipettes, laboratory equipment, laboratory measurements, pipette dimensions, glass pipettes, laboratory standards.