ISO 18472:2018

Overview

ISO 18472:2018 defines requirements for test equipment used to evaluate biological and chemical indicators for sterilization of health care products. The standard focuses on resistometers - laboratory test devices that create precise, repeatable sterilizing environments - and specifies performance, measurement, control and calibration requirements needed to test indicators for steam, ethylene oxide (EO), dry heat and vaporized hydrogen peroxide processes. It is intended to be used together with the test methods in the ISO 11138 (biological indicators) and ISO 11140 (chemical indicators) series.

Key topics and technical requirements

• Resistometer performance: requirements for accurate, repeatable control of key process variables (temperature, humidity/steam, gas concentration, exposure time) to characterize indicator response.
• Measurement accuracy and precision: expectations for instrumentation and data recording to ensure reliable test results.
• Process control and cycle profiling: specification of come-up/come-down periods, exposure periods and cycle sequencing for reproducible testing.
• Air leakage testing: procedures and acceptance criteria to confirm test chamber integrity during exposures.
• Vaporized hydrogen peroxide, EO, steam and dry heat specifics: separate performance and operational requirements are described for each sterilant type.
• Calibration and documentation: calibration practices, traceability and required records to support routine quality control and conformity assessment.
• Informative characterization methods: annexes provide additional performance characterization and derivations useful for lab validation and method correlation.

Note: ISO 18472:2018 does not cover resistometers for low‑temperature steam/formaldehyde processes or equipment for isolator/room biodecontamination at atmospheric pressure.

Practical applications and users

Who uses ISO 18472:2018:

• Manufacturers of biological indicators and chemical indicators (quality and R&D labs).
• External testing laboratories and conformity assessment bodies that validate indicator performance.
• Medical device and sterile product manufacturers conducting routine quality control and performance characterization.
• Sterilization equipment designers and test engineers developing resistometers or laboratory sterilizers.
• Regulatory and hospital QA/QC teams referencing standardized test methods for indicator evaluation.

Practical benefits:

• Ensures reproducible, traceable testing of sterilization indicators.
• Improves confidence in indicator conformity to ISO 11138 / ISO 11140 requirements.
• Supports robust calibration, documentation and audit readiness for sterilization QA programs.

Related standards

• ISO 11138 series (biological indicators) - Parts 1–5 (2017 editions).
• ISO 11140‑1:2014 (chemical indicators - general requirements).
• ISO 11140‑3:2007, ISO 11140‑4:2007, ISO 11140‑5:2007 (Type 2 indicator test equipment).
• ISO 11138‑5:2017 (low temperature steam and formaldehyde test methods - referenced for exclusions).

ISO 18472:2018 is essential reading for laboratories and manufacturers focused on sterilization test equipment, resistometer validation, and reliable evaluation of biological and chemical indicators.