The LIB SO₂ Corrosion Test Chamber is designed to simulate a corrosive sulfur dioxide atmosphere for evaluating the durability of materials, protective coatings, and components exposed to industrial pollution or acidic environments.

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The chamber introduces SO₂ gas into the test space while simultaneously controlling gas concentration, temperature, humidity, and test duration. LIB’s standard product range supports an SO₂ concentration of 1 to 30 ppm, a temperature range of 15 to 80°C, and a humidity range of 30 to 98% RH.

LIB offers various chamber capacities from 100 to 1,000 liters. Reach-in, walk-in, and customized configurations are also available to accommodate different specimen sizes and testing requirements.

What Is SO₂ Corrosion Testing?

SO₂, or sulfur dioxide, is a gas commonly found in industrial emissions and polluted environments. When combined with high humidity, SO₂ can create a mildly acidic atmosphere that accelerates oxidation and corrosion on metal surfaces.

SO₂ corrosion testing is used to reproduce these conditions in a controlled laboratory environment. This enables manufacturers to evaluate:

• The corrosion resistance of metals.

• The durability of paint, plating, and protective coatings.

• The performance of electrical connectors, terminals, and electrical components.

• Changes in appearance and functionality after testing.

• The effectiveness of surface treatment solutions.

• The suitability of materials before mass production.

This test method is particularly suitable for products used in industrial areas, polluted urban environments, locations exposed to chemical emissions, or hot and humid climates.

Operating Principle of the SO₂ Corrosion Test Chamber

During testing, SO₂ gas is introduced into a sealed test chamber at a preset concentration. The control system maintains the programmed temperature, humidity, and test cycle.

An air circulation system distributes the SO₂ gas uniformly throughout the chamber, ensuring that all specimens are exposed to a stable and consistent atmosphere. Temperature and humidity can be set independently to reproduce a wide range of environmental conditions.

At the end of the test cycle, the remaining gas is directed to an exhaust treatment system. LIB chambers use a NaOH solution tank and spray mechanism to help neutralize SO₂ before discharge, improving safety in the laboratory area.

Key Features of the LIB SO₂ Corrosion Test Chamber

SUS316 Stainless Steel Test Chamber

The test chamber is manufactured from SUS316 stainless steel, which provides excellent corrosion resistance under conditions involving temperature, humidity, and SO₂ gas.

This construction helps improve the durability and service life of the equipment during long-term operation.

Gas-Tight Door Structure

Two layers of corrosion-resistant silicone rubber seals are installed between the chamber door and the cabinet body.

This design minimizes the risk of SO₂ leakage into the working environment.

Precise Temperature and Humidity Control

Temperature and humidity inside the test chamber can be adjusted independently.

This allows users to establish test conditions suitable for specific products, materials, and technical standards.

SO₂ Gas Concentration Control

An SO₂ gas sensor continuously monitors the concentration inside the chamber.

The system automatically adjusts the gas supply to maintain a stable test environment and improve the repeatability of test results.

Uniform Gas Circulation System

A circulation fan helps mix and distribute SO₂ gas evenly throughout the chamber.

This reduces concentration differences between different specimen locations.

Touchscreen Controller

The chamber is equipped with a color LCD touchscreen controller that supports:

• Test cycle programming.

• Data recording.

• Result storage.

• Fault alarms.

• Ethernet connection to a computer.

Exhaust Gas Treatment System

Residual SO₂ gas is passed through a dedicated neutralization system after testing.

This design helps prevent the release of corrosive gas and improves operational safety.

Technical Specifications of the LIB SO₂ Corrosion Test Chamber

Specification	SO-100	SO-225	SO-500	SO-800	SO-1000
Test chamber volume	100 L	225 L	500 L	800 L	1,000 L
Internal dimensions	400 × 500 × 500 mm	500 × 600 × 750 mm	700 × 800 × 900 mm	800 × 1,000 × 1,000 mm	1,000 × 1,000 × 1,000 mm
Overall dimensions	860 × 1,050 × 1,620 mm	960 × 1,150 × 1,860 mm	1,180 × 1,350 × 2,010 mm	1,280 × 1,550 × 2,110 mm	1,500 × 1,550 × 2,110 mm
Temperature range	15–80°C	15–80°C	15–80°C	15–80°C	15–80°C
Temperature fluctuation	±0.5°C	±0.5°C	±0.5°C	±0.5°C	±0.5°C
Humidity range	30–98% RH	30–98% RH	30–98% RH	30–98% RH	30–98% RH
SO₂ concentration	1–30 ppm	1–30 ppm	1–30 ppm	1–30 ppm	1–30 ppm
Air exchange rate	3–5 times/hour	3–5 times/hour	3–5 times/hour	3–5 times/hour	3–5 times/hour
Chamber material	SUS316	SUS316	SUS316	SUS316	SUS316
Controller	Programmable color LCD touchscreen
Connectivity	Ethernet and computer connection
Gas sensor	SO₂ gas sensor
Water supply	Automatic filtered water supply system
Door lock	Electromagnetic door lock
Exhaust treatment	SO₂ gas treatment and neutralization system