Overview
ISO 9812:2024 - "Corrosion of metals and alloys - Corrosion test method for disinfectant - Spray test method" defines an aerosol spray test to evaluate the corrosivity of disinfectant aerosols on metallic materials. The standard specifies cyclic exposure of prepared metal specimens to a disinfectant mist and ventilation stages, followed by mass- and surface-based assessment to determine corrosion rate and visible damage. The method is intended to simulate real disinfection environments and provide reproducible data for material selection, risk assessment and product compatibility.
Key topics and technical requirements
- Test principle: Cyclic exposure to disinfectant aerosol (spray) and ventilation, with post‑test evaluation of mass change and surface condition.
- Test cabinet: Recommended volume 1 m³ (other volumes allowed if homogeneity is demonstrated). Must control temperature, humidity and ventilation and be constructed from materials inert to the disinfectant. Suggested humidity control: 70–80% RH; temperature 20–25 °C.
- Spray equipment: Compressor, metering pump and sprayer producing aerosols ≤ 50 µm (≥90% of particles between 1–10 µm).
- Specimens: Typical metals include carbon steel, stainless steel, copper, aluminium and zinc. Specimen size is specified (50 × 25 × 2 mm with a 5 mm mounting hole); surfaces are degreased, ground and pretreated before testing.
- Cycle and timing: Test comprises repeated cycles (default n = 45). Each cycle = spray time + disinfectant maintain time (per product instructions) + ventilation time (30 min). Spray time is determined from cabinet volume, disinfectant concentration and spray flow.
- Instruments and tolerances: Analytical balance precision ±0.1 mg; oven capable of >120 °C with ±3 °C control; vernier caliper precision ±0.02 mm.
- Outcome and reporting: Calculation of corrosion rate, surface observations, and standardized reporting requirements. Annexes include test results format and a schematic test cabinet.
Applications and users
ISO 9812:2024 is practical for:
- Manufacturers of disinfectants assessing material compatibility and corrosivity of aerosol formulations.
- Medical device and healthcare equipment designers evaluating resistance to routine disinfection.
- Facilities managers and procurement teams selecting metal fixtures and hardware in healthcare, laboratory and public environments.
- Materials testing and corrosion laboratories implementing standardized disinfectant spray tests.
Keywords: ISO 9812:2024, corrosion test, disinfectant spray, aerosol corrosivity, corrosion rate, metal compatibility, test cabinet, specimen pretreatment.
Related standards
Normative references within ISO 9812 include:
Use ISO 9812:2024 to generate reproducible, application-focused data on how disinfectant aerosols affect common metals and alloys in real-world disinfection scenarios.