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Sulfur dioxide (SO2) is one of the most common corrosive gases in industrial atmospheres and polluted environments — combined with humidity, it forms sulfurous and sulfuric acid on metal and electronic surfaces, causing corrosion, contact failure, and material degradation. SO2 is often used alongside H2S, Cl2, and NO2 in mixed gas testing to simulate real industrial atmospheres.

Reproduce precise gas concentration, temperature, and humidity conditions to evaluate connectors, PCBs, metal fittings, and industrial equipment — meeting IEC 60068-2-42, ISO 6988, and ASTM B845 standards.

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SO₂ Gas Corrosion Test (Test Kd)

SO₂ gas corrosion testing evaluates the corrosion resistance of electrical contacts, connectors, and electronic components when exposed to sulfur dioxide under controlled humidity conditions.

The test chamber controls:

· SO₂ concentration

· Temperature

· Relative humidity

· Exposure duration

Common standards:

· IEC 60068-2-42 (Test Kd)

Continuous SO₂ Corrosion Test

Continuous SO₂ corrosion testing exposes materials, metal samples, and coated specimens to a constant sulfur dioxide atmosphere for an extended period.

Unlike contact corrosion testing, this method focuses on long-term corrosion behavior and material resistance under sulfur dioxide environments.

Common standards:

· ISO 6988

· ASTM G87

​​​​ ​​​ SO2 Gas Corrosion Test Chamber

What you're afraid of: a connector that fails from contact corrosion, not a visible defect Electrical contacts and connectors that pass a visual inspection can still fail in service once SO₂ combines with humidity to form sulfurous acid on the contact surface — a failure mode no eye test catches. This chamber controls SO₂ concentration, temperature, and humidity precisely across a 15℃~+80℃ range with programmable gas injection and exhaust cycles, reproducing that failure mechanism before it reaches the field. Adjustable concentration (~25ppm typical) · 15℃~+80℃ · 30–98% RH · IEC 60068-2-42

Mixed Flowing Gas (MFG) Corrosion Test

Mixed Flowing Gas corrosion testing evaluates product reliability under low concentrations of multiple corrosive gases commonly found in industrial and indoor environments.

The test combines sulfur-containing and other corrosive gases, such as:

· SO₂

· H₂S

· NO₂

· Cl₂

to simulate complex atmospheric pollution conditions.

Common standards:

· ASTM B845

· EIA-364

· IEC 60068 series

Industrial Atmosphere Corrosion Test

Industrial atmosphere corrosion testing simulates real-world corrosive environments where products are exposed to sulfur dioxide, humidity, temperature variations, and atmospheric pollutants.

Applicable standards:

· ISO 6988

· IEC 60068 series

​​​​ ​​​  Mixed Flowing Gas (MFG) Test Chamber

What you're afraid of: a single-gas pass that doesn't predict real-world failure A component validated against SO₂ alone can still fail in the field, because real industrial and urban atmospheres rarely deliver just one corrosive gas at a time. This chamber controls SO₂, H₂S, Cl₂, and NO₂ simultaneously, reproducing the complex mixed-gas environment electronics and telecom equipment actually face — and complying directly with ASTM B845. Simultaneous SO2/H2S/Cl2/NO2 control · Complies with ASTM B845 · Simulates complex atmospheres

Large-Scale / Custom Gas Corrosion Test

Application-dependent

Oversized samples, high-volume production batches, and full assemblies often exceed the capacity of standard gas corrosion chambers, requiring disassembly or a dedicated large-format testing space.

​​​​Walk-In Toxic Gas Test Chamber

What you're afraid of: a production batch bottlenecked by one-sample-at-a-time testing High-volume production lines and oversized assemblies can't afford to validate one sample at a time in a benchtop chamber, especially when gas corrosion testing already runs for extended durations. This walk-in chamber is configurable for single-gas or multi-gas testing with customizable concentration, temperature, and humidity profiles, letting a full production batch move through validation together. Configurable single or multi-gas · Corrosion-resistant construction · Customizable profiles

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Frequently Asked Questions

What equipment is used for SO2 gas corrosion testing? 

SO2 gas corrosion testing is usually performed using a dedicated SO2 gas corrosion test chamber, which precisely controls gas concentration, temperature, and humidity. LIB provides single-gas and mixed-gas corrosion chambers for different testing requirements.

What is the difference between SO2 testing and mixed flowing gas (MFG) testing? 

SO2 testing exposes samples to a single corrosive gas to evaluate a specific corrosion mechanism. Mixed flowing gas testing combines several corrosive gases, such as SO2, H2S, Cl2, and NO2, to more closely simulate complex real-world industrial and urban pollution environments.

Can one chamber perform both SO2 and other gas corrosion tests? 

Yes. LIB mixed flowing gas chambers can perform combined multi-gas corrosion testing, including SO2. However, applications requiring only single-gas SO2 exposure typically use a dedicated SO2 chamber for simpler and more cost-effective testing.

What industries need SO2 gas corrosion testing? 

SO2 gas corrosion testing is widely used in:

· Electronics and telecommunications

· Automotive

· Metal finishing and coatings

· Industrial equipment

· Power and energy

· Aerospace

What warranty and service does LIB provide? 

LIB provides:

· 3-year warranty

· Lifetime maintenance support

· Technical assistance

· Engineering consultation

Need a SO2 Gas Corrosion Testing Solution?

Whether you need SO2 gas corrosion testing, mixed flowing gas testing, or a customized industrial atmosphere corrosion simulation, LIB can provide the right solution.

Our engineers can recommend the most suitable test equipment based on your product requirements, industry standards, and testing objectives.

Contact LIB today to discuss your gas corrosion testing requirements.