Salt Spray Chambers

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Salt Spray Chambers: Fog Testing to ISO 9227 and ASTM B117

A salt spray chamber tests the corrosion resistance of coatings and metal products by exposing them to controlled salt fog for hundreds of hours. The result is the time to the onset of corrosion - the figure buyers and auditors ask for, but valid only if the chamber temperature, saturator temperature and fog collection rate meet the standard.

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  • ISO 9227 & ASTM B117plus JIS Z 2371 and MIL-STD
  • NSS, AcSS, CASSthree test modes
  • 108 L test chamber600 × 450 × 400 mm
  • 220 V, 50 Hzno three-phase installation

Specifications of the unit we have delivered

Specification 108 L salt spray chamber (touch screen)
Test chamber size (L × W × H) 600 × 450 × 400 mm
Machine size (L × W × H) 1.070 × 600 × 1.180 mm
Chamber temperature NSS & AcSS 35 ± 1 °C · CASS 50 ± 1 °C
Saturator temperature NSS & AcSS 47 ± 1 °C · CASS 63 ± 1 °C
Humidity 85-98% RH
Temperature uniformity ± 0,5 °C
Fog collection rate 1.0-2.0 mL / 80 cm² / h
Power supply AC 220 V, 50 Hz
Standards referenced ISO 9227, ASTM B117, ISO 4628-3, JIS Z 2371, JIS G 3141, IEC 60068-2-11, GB/T 2423.17, GJB 150.1, MIL-STD-810F, MIL-STD-883E
Indicative lead time 7-8 weeks

The figures here come from the specification sheet of the unit we delivered. Other chamber sizes are available; tell us your specimen dimensions and quantity.

Three test modes and when to use them

NSS - neutral salt spray

  • Sodium chloride solution at neutral pH, chamber at 35 °C. The most common mode and the one most buyer specifications ask for.
  • Used for paint coatings, metallic coatings, galvanising and general metal products.

AcSS and CASS - accelerated

  • AcSS uses a solution acidified with acetic acid; CASS adds copper chloride and runs at 50 °C.
  • Used for decorative copper-nickel-chromium coatings and anodic coatings on aluminium, where NSS is too slow.

Corrosion testing: chamber and electrochemical methods

Model Best for Price Purchase
Salt Spray Test Chamber Touch Screen 108 L NSS/AcSS/CASS, 600 × 450 × 400 mm chamber, 220 V; already delivered on request Request quote
Corrtest CS300M potentiostat Corrosion rate in hours from Tafel curves rather than hundreds of hours Rp 99.144.000 Buy online
Corrtest CS350M (with EIS to 1 MHz) EIS to judge coating integrity before corrosion is visible Rp 167.884.000 Buy online
Corrtest CS930 corrosion cell (5 ports, 500 mL) The standard cell for electrochemical corrosion testing Rp 20.655.000 Buy online
Corrtest CS934 coating evaluation cell Measures coatings on flat specimens Rp 5.784.000 Buy online

Store catalogue prices before 11% VAT and shipping; subject to change. Stock and delivery time are confirmed in the quotation.

Salt spray and electrochemical testing complement each other

Salt spray answers "how long will this product last" in a form buyers and standards accept, but one cycle takes hundreds of hours and the result is qualitative: rust has appeared or it has not. Electrochemical testing answers "how fast does this metal corrode and why" within hours, with a corrosion rate from Tafel curves and an assessment of coating integrity from EIS. Coating development laboratories typically use electrochemistry to screen formulations quickly, then salt spray to prove the chosen one.

Frequently asked questions

How long is a salt spray test run?

The duration is set by the product specification, commonly 24, 48, 96, 240 and over 1,000 hours for heavy-duty coatings. What is reported is the hours of exposure until the failure criterion is reached.

What is the difference between ISO 9227 and ASTM B117?

Both govern salt fog testing with nearly identical parameters, including the 35 °C chamber temperature and the fog collection rate. They differ in procedural detail, reporting and additional modes. A chamber that meets both gives you room when buyers ask for different standards.

Can salt spray results predict field life?

Not directly. Salt spray is a comparative screening test, not a simulation of real weather. It is very useful for comparing two coatings under the same procedure, but 500 hours in a chamber does not equal a specific number of years outdoors.

What does the room need?

A 220 V supply, demineralised water for the solution and saturator, a drain and ventilation. The 108 L unit measures 1,070 × 600 × 1,180 mm, so it needs clearance around it to open the lid.

Need help choosing a specification?

Tell us about your samples, working temperature or test method. Our team will match the right model and send a formal quotation with an estimated delivery time.

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