ISO 4797:2015

Overview

ISO 4797:2015 is an international standard developed by the International Organization for Standardization (ISO) that specifies requirements for boiling flasks with conical ground joints used in laboratory settings. Designed for general laboratory purposes, the standard covers a series of boiling flasks made from borosilicate glass 3.3, ensuring durability, compatibility, and safety during typical lab operations. The third edition of this standard, published in December 2015, updates prior versions to include new flask volumes, refined dimensions, and thermal shock endurance testing.

Key Topics

• Types of Boiling Flasks
  The standard defines three main types of boiling flasks with conical ground joints:

  • Conical flasks
  • Flat-bottom flasks
  • Round-bottom flasks

• Series and Capacities
  ISO 4797:2015 specifies two series for each type, differing in height and joint size selection. This facilitates compatibility with various laboratory setups and serves as guidelines for national standards adoption.

• Material Requirements
  All boiling flasks must be made of borosilicate glass 3.3 compliant with ISO 3585. The glass must be free from visible defects or internal stresses that could impact performance during heating or chemical exposure.

• Dimensions and Joint Specifications
  Dimensions such as overall height, body diameter, and minimum wall thickness must adhere to ISO 1773. Ground glass joints conform to the ISO 383 k6 series, enabling interchangeability among different laboratory glassware.

• Thermal Shock Endurance
  Testing per ISO 718 ensures boiling flasks resist thermal shock:

  • Flasks ≤ 3,000 ml volume endure up to 150 °C
  • Flasks > 3,000 ml endure up to 100 °C

• Marking and Identification
  Flasks must be permanently marked with:

  • Nominal volume (e.g., “100 ml”)
  • Ground joint size (e.g., “29/32”)
  • Manufacturer or vendor name/mark
  • Surface suitable for additional marking

  Reference to the ISO 4797 standard is recommended to enhance traceability.

Applications

ISO 4797:2015 boiling flasks are crucial in laboratories conducting chemical synthesis, distillation, reflux, and other heating processes that require durable glassware capable of withstanding thermal stresses. Their conical ground joints allow for secure connections to condensers, adapters, and other apparatus, providing leak-proof seals essential for maintaining system integrity.

Typical application areas include:

• Research and development labs
• Quality control and testing facilities
• Educational laboratories
• Pharmaceutical manufacturing
• Chemical analysis and processing

The robust design, material quality, and standardized joint sizes ensure seamless integration into a wide range of laboratory workflows.

Related Standards

ISO 4797:2015 references other important standards to maintain consistency and reliability:

• ISO 383 - Laboratory glassware: Interchangeable conical ground joints
• ISO 718 - Laboratory glassware: Thermal shock and thermal shock endurance test methods
• ISO 1773 - Laboratory glassware: Narrow-necked boiling flasks (dimensional specifications)
• ISO 3585 - Borosilicate glass 3.3: Properties and requirements

These interconnected standards together provide comprehensive guidelines for manufacturing, testing, and selecting high-quality laboratory glassware.

By adhering to ISO 4797:2015, laboratories worldwide ensure that boiling flasks meet internationally recognized safety, quality, and performance criteria. This standard supports laboratory efficiency and safety by providing compatible, reliable boiling flask designs optimized for thermal resilience and precise glass joint fitting.