Product Categories

An angled, front-left view of the Auto Technology C Series corrosion test chamber, showing the integrated touch screen controller, air pressure gauge, and durable fiberglass construction.

MIL-STD-810 Method 509.7 Salt Fog Chamber – C Series Size 20

The Auto Technology C Series Size 20 is a touchscreen-controlled salt fog chamber for MIL-STD-810 Method 509.7. The chamber produces the required neutral salt fog at 35 ±2 °C and can automatically transition to an ambient-air drying phase.

  • Internal Volume: Approximately 20 ft³ (594 L)
  • Exposure: 24-hour fog/24-hour dry cycling or 48-hour fog/48-hour dry exposure
  • Fog Requirement: 1-3 mL/80 cm²/hour using 5 ±1% NaCl solution
  • Controls: 6-inch color touchscreen with stored test sequencing
  • Solution Capacity: Integrated 60-gallon reservoir

The Method 509.7 drying phase requires standard ambient temperature below 50% RH. Laboratory conditions must support that requirement.

SKU: CSERIES20-MIL-STD-810-5097 Categories: ,

Description

MIL-STD-810 Method 509.7 Salt Fog Chamber

The Auto Technology C Series Size 20 is configured for the neutral salt fog and ambient drying conditions used by MIL-STD-810H Method 509.7. The method is used to evaluate protective coatings and finishes and to identify physical, electrical, and corrosion problems associated with salt deposits.

The C Series combines atomized salt fog, chamber heating, touchscreen sequencing, and automatic ambient-air transitions in one corrosion-resistant cabinet.

Method 509.7 is a screening procedure: MIL-STD-810H does not present salt fog exposure as a direct predictor of coating service life. Test duration, item configuration, operational checks, and any variations must be established in the approved test plan.

C Series Size 20

Usable exposure volume Approximately 20 ft³ / 594 L
Base dimensions 95 × 43 in / 242 × 110 cm
Controls 6-inch color touchscreen
Solution reservoir Integrated 60-gallon reservoir
Fog delivery Venturi atomizer with baffled dispersion tower

C Series Size 20 salt fog chamber dimensional drawing
Size 20 chamber dimensional information. Final installation must account for ventilation, utilities, drainage, and service access.

Method 509.7 Exposure Sequence

Step Condition
Preconditioning Hold the test item at 35 °C for at least two hours before introducing salt fog.
Fog period Continuously atomize the specified salt solution for 24 hours, or for the duration established by the test plan.
Dry period Expose the item to standard ambient temperature below 50% RH for 24 hours.
Repeat Repeat the fog and dry periods at least once, producing two wet periods and two dry periods.

MIL-STD-810H also permits a 48-hour salt fog exposure followed by 48 hours of drying when the alternating 24-hour sequence is not used.

Salt Fog Conditions

Chamber temperature 35 ±2 °C
Salt concentration 5 ±1% NaCl by weight
Collected-solution pH 6.5-7.2 at 35 ±2 °C
Fallout rate 1-3 mL/80 cm²/hour, based on at least 16 hours
Collectors At least two, positioned nearest to and farthest from the nozzle
Air movement Minimal during fog exposure

Fog Generation and Chamber Interior

Interior of the C Series Size 20 MIL-STD-810H salt fog chamber
C Series Size 20 interior showing the corrosion-resistant cabinet and standard lower-level specimen-support area.
  • Venturi atomizer produces a finely divided salt fog.
  • Baffled dispersion reduces large droplets and direct specimen impingement.
  • Humidifying tower conditions the compressed air used for atomization.
  • Solution-contact components are constructed from corrosion-resistant materials.
  • Exposed solution drains from the chamber and is not returned to the reservoir.

Touchscreen Cycle Control

C Series touchscreen for MIL-STD-810H Method 509.7 cycle selection

The touchscreen sequences chamber heating, salt fog, and ambient-air drying phases. Operators can select stored programs, monitor chamber status, view alarms, and access manual functions.

Optional data logging captures chamber-performance information on the controller memory card. Independent calibrated instruments may also be used to satisfy laboratory reporting requirements.

Drying-condition requirement: The C Series introduces laboratory air during the dry phase. The laboratory must maintain standard ambient temperature and less than 50% RH for the chamber to reproduce the specified Method 509.7 drying condition.

Specify the MIL-STD-810 revision, exposure sequence, test-item dimensions, orientation, loading quantity, operational checks, and required data records when requesting a Method 509.7 Size 20 configuration.

Related products