The Technology
How a Salt Spray Chamber Works
A salt spray chamber atomises a sodium chloride solution through a pressurised nozzle, creating a controlled salt fog inside a sealed, temperature-regulated cabinet. Specimens are mounted at 15–30° from vertical and exposed continuously for the duration set by the applicable standard.
The chamber maintains a collection rate of 1.0–2.0 mL/80cm²/hr and temperature of 35 ±1°C (fog zone) to ensure reproducible, comparable results. ASTM B117 defines the apparatus and procedure only — pass/fail criteria are set by the material or product standard that references it.
ASTM B117 Key Parameters
NaCl concentration5 ± 0.1 wt%
Solution pH (at 25°C)6.5 – 7.2
Fog zone temperature35 ± 1°C
Collection rate1.0 – 2.0 mL/80cm²/hr
Exposure typeContinuous
Specimen angle15 – 30° from vertical
Standards
Standards Your Chamber Needs to Support
Supplier qualification and OEM approvals require documented evidence that your chamber meets the apparatus standard. Indeecon chambers ship with calibration certificates and can be commissioned with IQ/OQ documentation.
ASTM B117Standard Practice for Operating Salt Spray (Fog) Apparatus
ISO 9227:2022Corrosion tests in artificial atmospheres — Salt spray tests
DIN 50021Spraying with salt solutions — German automotive
JIS Z 2371Methods of salt spray testing — Japanese Industrial Standard
MIL-STD-810 M509Environmental engineering — Salt fog method
IEC 60068-2-11Environmental testing — Salt mist
