Overview

ISO 1773:1997 specifies international requirements for laboratory glassware, focusing specifically on narrow-necked boiling flasks, including conical flasks and round- or flat-bottomed boiling flasks. Developed by ISO Technical Committee ISO/TC 48 (Laboratory glassware and related apparatus), Subcommittee SC 2 (Non-volumetric laboratory glassware), this standard ensures uniformity in dimensions, materials, and construction for glassware widely used in laboratory testing and manufacturing.

This second edition revises the original 1976 standard by updating the dimensions, tolerances, materials, and testing methods, aligning them with ISO 3585 standards for borosilicate glass 3.3. The standard facilitates compatibility and safety in laboratory environments.

Key Topics

Scope and Application ISO 1773:1997 applies to a series of conical flasks and boiling flasks with narrow necks intended for direct laboratory use or as components in other laboratory equipment manufacturing.
Material Requirements All flasks covered by this standard must be made of borosilicate glass 3.3 as per ISO 3585. This glass type offers high chemical durability and thermal resistance, essential for boiling and heating applications.
Dimensions and Design Specifications
- Conical flasks: Capacities range from 25 mL up to 5000 mL, with specified diameters, neck lengths (1 to 1.25 times the neck diameter), wall thickness, and base curvature to ensure stability and functional reliability.
- Boiling flasks (round and flat bottom): Capacities vary from 50 mL to 10,000 mL, with defined base diameters approximately 50% of maximum body diameter for stability.
- Wall thickness minimum values are outlined to balance durability and safety.
- The neck must maintain a near-circular cross-section and reinforced at the opening to withstand lab conditions.
Construction Criteria Flasks must stand vertically without tilting or rocking when placed on horizontal surfaces, ensuring practical laboratory safety and ease of handling.
Marking and Traceability Each flask must bear clear, permanent markings for:
- Nominal capacity (e.g., "100 ml")
- Manufacturer’s name or trademark
- A surface suitable for additional markings with pencil or similar tools Inclusion of reference to ISO 1773:1997 on the flask is recommended for clarity.

Applications

ISO 1773:1997 narrow-necked boiling flasks are fundamental tools in:

Chemical laboratories for refluxing, boiling, mixing, and heating solutions with precise volume control.
Educational institutions for chemistry training and experiments requiring standard, reliable laboratory glassware.
Pharmaceutical and biotechnological processes where controlled heating and chemical reactions must be conducted safely.
Industrial manufacturing settings for quality control and product development requiring standardized glassware for processing and testing.

Adherence to ISO 1773 guarantees compatibility with existing laboratory apparatus and contributes to reproducible experimental conditions, helping laboratories worldwide maintain best practices.

Related Standards

For comprehensive laboratory glassware quality and compatibility, ISO 1773:1997 references and aligns with these standards:

ISO 3585:1991 – Borosilicate glass 3.3 - Properties and testing (material specification)
ISO 383:1976 – Laboratory glassware - Interchangeable conical ground joints
ISO 4797:1981 – Laboratory glassware - Conical flasks and flasks with conical ground joints
ISO 3819:1985 – Laboratory glassware - Beakers, test tubes, and culture tubes
ISO 4785:1997 – Laboratory glassware - Straight bore glass taps for general use

These related standards ensure a harmonized approach covering materials, joints, volumetric and non-volumetric laboratory glassware, enhancing interoperability and performance safety among various pieces of equipment.

Keywords: ISO 1773, laboratory glassware, narrow-necked boiling flasks, conical flasks, borosilicate glass, glassware dimensions, laboratory safety, boiling flask dimensions, ISO standards laboratory, glass flask specification.

Overview

Key Topics

Scope and Application ISO 1773:1997 applies to a series of conical flasks and boiling flasks with narrow necks intended for direct laboratory use or as components in other laboratory equipment manufacturing.
Material Requirements All flasks covered by this standard must be made of borosilicate glass 3.3 as per ISO 3585. This glass type offers high chemical durability and thermal resistance, essential for boiling and heating applications.
Dimensions and Design Specifications
- Conical flasks: Capacities range from 25 mL up to 5000 mL, with specified diameters, neck lengths (1 to 1.25 times the neck diameter), wall thickness, and base curvature to ensure stability and functional reliability.
- Boiling flasks (round and flat bottom): Capacities vary from 50 mL to 10,000 mL, with defined base diameters approximately 50% of maximum body diameter for stability.
- Wall thickness minimum values are outlined to balance durability and safety.
- The neck must maintain a near-circular cross-section and reinforced at the opening to withstand lab conditions.
Construction Criteria Flasks must stand vertically without tilting or rocking when placed on horizontal surfaces, ensuring practical laboratory safety and ease of handling.
Marking and Traceability Each flask must bear clear, permanent markings for:
- Nominal capacity (e.g., "100 ml")
- Manufacturer’s name or trademark
- A surface suitable for additional markings with pencil or similar tools Inclusion of reference to ISO 1773:1997 on the flask is recommended for clarity.

Applications

ISO 1773:1997 narrow-necked boiling flasks are fundamental tools in:

Chemical laboratories for refluxing, boiling, mixing, and heating solutions with precise volume control.
Educational institutions for chemistry training and experiments requiring standard, reliable laboratory glassware.
Pharmaceutical and biotechnological processes where controlled heating and chemical reactions must be conducted safely.
Industrial manufacturing settings for quality control and product development requiring standardized glassware for processing and testing.

Adherence to ISO 1773 guarantees compatibility with existing laboratory apparatus and contributes to reproducible experimental conditions, helping laboratories worldwide maintain best practices.

Related Standards

For comprehensive laboratory glassware quality and compatibility, ISO 1773:1997 references and aligns with these standards:

ISO 3585:1991 – Borosilicate glass 3.3 - Properties and testing (material specification)
ISO 383:1976 – Laboratory glassware - Interchangeable conical ground joints
ISO 4797:1981 – Laboratory glassware - Conical flasks and flasks with conical ground joints
ISO 3819:1985 – Laboratory glassware - Beakers, test tubes, and culture tubes
ISO 4785:1997 – Laboratory glassware - Straight bore glass taps for general use

ISO 1773:1997 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Borosilicate glass 3.3 — Properties

Laboratory glassware — Interchangeable conical ground joints

Laboratory glassware — Flasks with conical ground joints

Laboratory glassware — Beakers

Laboratory glassware — Straight-bore glass stopcocks for general purposes

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