Overview
SIST ISO 7712:1995 is an international standard published by the International Organization for Standardization (ISO) that specifies the requirements for disposable Pasteur pipettes, a common type of laboratory glassware. These pipettes are uncalibrated and designed primarily for the transfer and dispensing of drops of solutions or suspensions, especially in biological and chemical laboratories.
The standard outlines the specifications for two nominal sizes of disposable Pasteur pipettes and provides detailed requirements for their construction, dimensions, sterilization resistance, packaging, and marking. Established to ensure quality and consistency, ISO 7712 facilitates compatibility and safety in laboratory procedures worldwide.
Key Topics
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Scope and Purpose
ISO 7712 covers disposable glass Pasteur pipettes intended for single use in dispensing small volumes of liquids. It ensures these pipettes meet essential criteria for length, wall thickness, and chemical durability suitable for laboratory settings.
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Design and Dimensions
Two sizes are standardized with nominal overall lengths of approximately 145 mm and 230 mm. The standard defines precise tolerances for dimensions, including pipette body length, wall thickness, and external diameters.
- The pipette features a long, tapered delivery jet designed to fit into small test tubes.
- A constriction near the top secures fibrous plugs if used, preventing contamination.
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Material and Construction
The pipettes must be made of glass with adequate chemical and thermal resistance, free from visible defects and internal stress. Their structural strength should withstand handling, transport, and sterilization processes.
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Sterilization Resistance
The glass pipettes must tolerate sterilization methods without deterioration:
- Dry heat at 160 ±1°C for 60 minutes.
- Saturated steam in an autoclave at 121 ±1°C for 20 minutes or 134 ±1°C for 35 minutes.
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Packaging and Marking
Pipettes are packed in cartons, typically containing 250 units, with protective materials to prevent damage and contamination during transit.
Each package must be clearly marked with:
- Manufacturer’s name/mark
- Product description (including size)
- Quantity
- Batch number or manufacture date
- Reference to ISO 7712
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Cleanliness Requirements
The pipettes should be supplied clean and free from visible dirt or staining, ensuring immediate usability.
Applications
Disposable Pasteur pipettes conforming to ISO 7712 are essential tools in:
- Biological and chemical laboratories for transferring liquids in micro-volumes.
- Medical and pharmaceutical research involving sterile handling of biological samples.
- Clinical diagnostic laboratories where contamination control and sterility are critical.
- Educational institutions for teaching and training purposes to promote safe laboratory practices.
- Industrial labs requiring standardized consumables for quality assurance.
The standardized dimensions and sterilization compatibility make these pipettes suitable for consistent and safe liquid handling where precision and contamination control are vital.
Related Standards
- ISO 0417: Laboratory volumetric instruments - Principles of design and construction of disposable volumetric articles. This standard complements ISO 7712 by outlining general principles for creating disposable laboratory volumetric instruments.
- Other laboratory glassware standards under ISO/TC 48 technical committee focus on additional glassware types, calibration, and quality assurance to support standardized laboratory environments.
Keywords: ISO 7712, disposable Pasteur pipettes, laboratory glassware, pipette dimensions, sterilization resistance, glass pipettes, liquid transfer, biochemical laboratory standards, uncalibrated pipettes, packaging of laboratory glassware.
