ISO 7203-4:2022

Overview

ISO 7203-4:2022 provides internationally recognized requirements for Class A foam concentrates used in fire extinguishing media. Developed by ISO, this standard details the specified properties, performance criteria, and essential testing methods for liquid foam concentrates designed for suppressing and preventing the reignition of Class A fires. These fires involve solid, organic-based materials such as wood, paper, textiles, rubber, certain plastics, and vegetation, which typically burn with glowing embers.

This standard ensures uniformity and safety by defining test procedures, physical and chemical property limits, marking, packaging, and mandatory documentation for foam concentrates intended for Class A fire suppression.

Key Topics

• Scope and Definitions
  The standard outlines the types of foam concentrates suitable for extinguishing Class A fires and defines key terms such as “expansion,” “drainage,” “sediment,” and “Class A fuel.”

• Performance Requirements
  ISO 7203-4:2022 prescribes minimum performance criteria, including:

  • Foam expansion and drainage characteristics
  • Tolerance to freezing and thawing cycles
  • Acceptable sediment content before and after aging
  • pH range and stability under temperature variation
  • Surface tension before and after temperature conditioning
  • Fire extinguishing performance on designated test fires

• Compatibility and Use
  The standard covers use with potable and sea water, requiring products used with seawater to maintain identical recommended concentrations and account for increased equipment corrosion.

• Health, Safety, and Environmental Information
  Manufacturers must supply toxicology and ecotoxicology data for their products at recommended use concentrations to support environmental and occupational safety.

• Marking and Packaging
  ISO 7203-4:2022 sets clear requirements for permanent, legible container markings, correct product labeling (including concentration, temperature tolerance, and sea water suitability), and guidance on packaging to preserve foam integrity.

Applications

ISO 7203-4:2022 is vital for industries and organizations involved in fire protection and emergency response. Typical applications include:

• Wildland and Forest Fire Services:
  Reliable foam concentrates enhance suppression effectiveness on burning vegetation and timber.

• Structural Firefighting:
  Used by municipal fire departments for buildings containing wood, paper, textiles, and related combustibles.

• Industrial and Storage Facilities:
  Protection of paper mills, lumber storages, textile warehouses, and other facilities dealing with organic solids.

• Aircraft and Marine Applications:
  Used where specialized, corrosion-resistant firefighting systems are required, with attention to compatibility with sea water as applicable.

• End-User Guidance:
  The standard helps purchasers and safety professionals select compliant Class A foam concentrates, specify storage and handling conditions, and understand labeling and documentation essentials.

Meeting ISO 7203-4:2022 requirements supports regulatory compliance, ensures effective Class A fire suppression, aids in risk management, and provides for international acceptance of firefighting products.

Related Standards

Organizations implementing ISO 7203-4:2022 may also reference:

• ISO 7203-2: Medium and high-expansion foam concentrates for water-immiscible liquids.
• ISO 7203-3: Low-expansion foam concentrates for water-miscible liquids.
• ISO 7165: Specification for portable fire extinguishers.
• ISO 7076 series: Specifications for foam-based extinguishing systems.
• EN 1568-3: European specification for low expansion foam concentrates for surface application.
• ISO 304, ISO 3104, ISO 3219-2: Methods for measuring surface tension, viscosity, and rheological properties.
• Globally Harmonized System of Classification and Labelling of Chemicals (GHS): For chemical safety data.

By adhering to ISO 7203-4:2022, manufacturers, emergency services, and purchasers ensure the effectiveness, reliability, and safety of Class A foam concentrates in a wide range of fire protection applications.