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Salt-Fog Testing

Salt-Fog Testing Lab

Salt Fog Testing Capabilities at Keystone Compliance

Keystone Compliance has a salt fog chamber that is one of the largest salt fog chambers manufactured and has an inside dimension of 8’ x 4’ x 4’. However, we have created custom oversized chambers to accommodate much larger devices including cars, drones and large pieces of machinery. If you have a large unit, we can likely find a way to test it. The chamber is capable of salt fog testing, salt mist testing, salt spray testing and salt laden testing as described in most popular test specifications.

Salt-Fog Test Equipment at Keystone Compliance

Keystone Compliance has one large salt-spray test chamber measuring 8’ x 4’ x 4’.

Salt-Fog Testing Overview

Salt-fog testing, per MIL-STD 810 Method 509.4, determines the corrosion resistance of materials and impact of introducing a humid, salty solution on electrical components. Typical problems brought about by salt spray are:

Corrosion Effects

  • Corrosion due to electrochemical reaction.
  • Accelerated stress corrosion.
  • Formation of acidic/alkaline solutions following salt ionization in water.

Electrical Effects

  • Impairment of electrical materiel due to salt deposits.
  • Production of conductive coatings.
  • Corrosion of insulating materials and metals.

Physical Effects

  • Clogging or binding of moving parts of mechanical components and assemblies.
  • Blistering of paint as a result of electrolysis.

The most common coatings tested are steel, brass and zamak. The salt-fog test essentially tests corrosion resistance through an accelerated process within a salt-fog chamber. The chamber controls the amount of salt-fog, concentration of salt and pH. Different coatings have different behaviors and require different types of testing with varying durations.

Keystone Compliance is a salt-fog test lab with a large chamber and significant experience. Contact us to determine how we can help you meet your salt-fog testing requirements.


Salt Fog Testing Specifications

  • ASTM G85 – 09 Standard Practice for Modified Salt Spray Testing
  • Annex A1, acetic acid-salt spray test, continuous
  • Annex A2, cyclic acidified salt-spray test
  • Annex A3, seawater acidified test, cyclic (SWAAT)
  • Annex A4, SO2 salt spray test, cyclic
  • Annex A5, dilute electrolyte cyclic fog dry test
  • ASTM B117 – 09 Standard Practice for Operating Salt Spray (Fog) Apparatus
  • EN 50155 Section 10.2.10 Salt-Fog Test
  • ISO 9227:2006 Corrosion tests in artificial atmospheres — Salt spray test
  • ISO 12944-6:1998 Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 6: Laboratory performance test methods
  • MIL-STD-202 Method 101 Salt-Fog Test
  • MIL-STD-810 Method 509.4 Salt-Fog Testing
  • MIL-STD-883 Method 1009 Salt Fog Test
  • MIL-STD-1344 Section 1001 Salt Fog Testing
  • RTCA/DO 160 Section 14 Salt-Fog Test