ISO 20480-5:2023

Overview

ISO 20480-5:2023 - part of the Fine bubble technology series - defines the vocabulary and general principles for shelled bubbles: gas-filled structures deliberately encapsulated by manufactured shells and dispersed in liquids. The standard sets scope boundaries (explicitly excluding naturally formed adhesive layers), and provides a structured set of terms and definitions that support consistent communication, testing and product development across industry, research and regulation.

Key topics

• Core definitions
  • Shelled bubble, shelled fine bubble (<100 µm), shelled ultrafine bubble (<1 µm), shelled microbubble (1–100 µm).
• Shell materials and types
  • Organic shell (lipids, polymers, proteins, surfactants), inorganic shell (colloidal/nanoparticles), hybrid shell.
  • Material subtypes: lipid shell, polymer shell, protein shell, surfactant shell.
• Shell structure and categorization
  • Monolayer, double layer, multilayer, soft shell, hard shell, cross‑linked vs noncross‑linked.
• Physical properties and metrics
  • Shell thickness, shell shape, zeta potential of shell, shelled bubble size half-life and number half-life stability.
  • Recommended characterization techniques mentioned: TEM, SEM, dark field microscopy, DLS and particle tracking analysis.
• Gas types
  • Bioinert vs bioactive gases; soluble vs insoluble gas classifications and examples.
• Generation and characterization terminology
  • Defined methods: dispersion method, condensation method, microfluidic system method, sonication‑microfluidics method.

Applications and users

ISO 20480-5:2023 is targeted at professionals who design, manufacture, test or regulate shelled bubble products and processes:

• Biomedical and medical device developers (contrast agents, drug/gene delivery, ultrasound imaging)
• Academic and industrial researchers in colloids, microfluidics and nanoengineering
• Food technologists and manufacturers exploring encapsulated gases or nutrient delivery
• Environmental, agricultural and separation technology developers
• Quality, regulatory and standards personnel who need consistent vocabulary for specifications, reporting and compliance

Practical benefits include consistent product descriptions across R&D, improved comparability of characterization data (size, stability, shell properties) and clearer communication for product acceptance in hospitals, food markets and industrial applications.

Related standards

• Part of the ISO 20480 series on fine bubble technology; consult the ISO website for other parts of the series and additional guidance from ISO/TC 281.