Pre-painted galvanized iron (PPGI) is widely used in construction, home appliances, steel structures, and industrial enclosures. While its coated surface provides initial corrosion protection, real-world failures still occur frequently, especially in coastal, humid, or polluted environments.
Typical customer complaints include:
Coating blistering after short outdoor exposure
Rapid red rust propagation from cut edges or scribed areas
Premature edge corrosion despite acceptable coating thickness
In many cases, the root cause is not the coating formulation itself, but an inaccurate or unstable salt spray test process.
ASTM B117 neutral salt spray testing is globally recognized as the baseline corrosion resistance evaluation method for coated steel products such as PPGI. However, the reliability of ASTM B117 results depends entirely on how precisely and consistently the test is executed.
That is where a professional, industrial-grade salt spray test chamber from LIB industry becomes essential.
ASTM B117 is not simply about spraying salt solution. It is a process-driven standard with strict requirements for specimen positioning, spray generation, temperature control, and long-term stability.
| Item | Specification |
|---|---|
| Chamber temperature | 35 ±1°C |
| Air saturator temperature | Compliant with NSS requirements |
| Salt solution concentration | 5% NaCl |
| Spray mode | Continuous / Intermittent |
| Deposition rate | 1.0–2.0 mL / 80 cm² / h |
LIB industry salt spray test chambers are engineered around this full process to ensure accuracy, repeatability, and confidence in every test.
According to ASTM B117, test specimens must be positioned at an angle of 15° to 30° from vertical to prevent condensate droplets from falling directly onto the surface and creating non-standard corrosion patterns.
How LIB industry supports this step:
Standard V-shaped and U-shaped specimen racks designed specifically for flat panels such as PPGI
Continuously adjustable angles to fully comply with ASTM B117 requirements
Corrosion-resistant rack materials that remain stable during long-term exposure
Optimized spacing to ensure uniform salt fog deposition on every panel
 | |
 Round Bar + V-Groove Sample Holder |  Insert-Type Sample Holder |
This ensures that all PPGI samples experience identical exposure conditions, forming the foundation for valid comparison.
ASTM B117 specifies:
5% NaCl salt solution
Deposition rate of 1.0–2.0 mL / 80 cm² / hour
Continuous, uniform, and uninterrupted fog generation
LIB industry salt spray test chamber advantages:
High-precision quartz spray nozzles
Uniform atomization
No crystallization or clogging during long-duration tests
Adjustable spray system
Fine control of fog output
Stable deposition rate throughout extended test cycles
Standard collection funnel and cylinder support
Easy verification of deposition rate before and during testing
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| quartz spray nozzles | Brine Mixing System |
A 500-hour salt spray test only has value if every single hour remains within ASTM B117 limits—and that is exactly what LIB industry chambers are designed to deliver.
ASTM B117 requires the chamber temperature to be maintained at 35 ±1°C, while the compressed air used for atomization must be properly humidified.
LIB industry’s precision control system includes:
Intelligent PID temperature control
Real-time adjustment to minimize fluctuations
Air saturator tower based on Henry’s Law
Ensures fully humidified air before salt fog generation
Prevents salt concentration shifts caused by dry air
Multi-side heating and optimized airflow design
Uniform temperature distribution throughout the chamber
Eliminates edge effects and localized over-corrosion
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This level of control ensures high repeatability across multiple test batches.
PPGI corrosion evaluation often requires 240, 500, or even 1000 hours of continuous salt spray exposure.
LIB industry industrial-grade reliability includes:
Automatic and manual water replenishment options
Low water level alarms to prevent test interruption
Support for extended unattended operation
Comprehensive safety protection:
Over-temperature protection
Water shortage protection
Overload and pressure abnormality protection
The result is a salt spray test chamber that does not merely “run,” but runs stably for the entire duration of demanding corrosion tests.
LIB industry salt spray test chambers are purpose-built solutions optimized for ASTM B117 testing and PPGI corrosion evaluation, rather than generic laboratory equipment.
Model | S-150 | S-250 | S-750 | S-010 |
Interior Volume (L) | 110 | 320 | 410 | 780 |
Temperature Range | Ambient ～ +60 ℃ | |||
Temperature Fluctuation | ± 0.5 ℃ | |||
Temperature Deviation | ± 2.0 ℃ | |||
Humidity Range | 95% ~ 98% RH | |||
Salt Fog Deposition | 1～2ml / 80cm2 · h | |||
Spray Type | Continuous / Periodic | |||
Salt Fog Collected | Fog collector and fog measure cylinder | |||
Air Preheating | Saturated air barrel | |||
Spraying System | Atomizer tower and Spray nozzles | |||
Controller | PID controller | |||
Safety Device | Humidifier Dry-combustion Protection; Over-temperature Protection; Over-current Protection; Water Shortage Protection; Earth leakage Protection | |||
Material | Glass fiber reinforced plastics | |||
| Standard Configuration | 6 round bars and 5 V-shaped grooves | |||
.jpg "How_LIB_industry_Salt_Spray_Chamber_Ensures_Accurate_ASTM_B117_Corrosion_Testing_for_PPGI_(2).jpg") | ASTM B117 Salt Spray Environmental Test Chamber Salt Spray Cyclic Corrosion Tester Salt Fog and SO2 Corrosion Chamber | |||
One-piece P.P or advanced PVC chamber construction
Excellent resistance to acid, alkali, heat, and aging
Transparent, impact-resistant lid
Continuous visual monitoring of corrosion behavior
Water-sealed structure
Prevents salt fog leakage
Protects surrounding laboratory equipment
7-inch full-color touchscreen controller
One-touch ASTM B117 test setup
Continuous and intermittent spray modes
Test data recording and export capability
Optional remote monitoring and communication interfaces
Suitable for laboratory and factory quality systems
Dedicated panel specimen rack system
One-touch defogging function after test completion
Prevents salt fog escape when opening the chamber
Modular internal layout
Easy maintenance and reduced operating costs
Absolutely. The chamber is equipped with V-shaped and U-shaped specimen racks designed for flat metal panels such as PPGI. Adjustable specimen angles (15°–30°) allow accurate evaluation of cut-edge corrosion and scribe creep, which are critical indicators for coated steel products.
Yes. The LIB industry salt spray chamber supports extended continuous testing (240 h, 500 h, 1000 h) with:
Automatic and manual water replenishment
Low water level alarms
Comprehensive safety protections
This allows reliable unattended operation without compromising test integrity.
In addition to ASTM B117 (NSS), LIB industry also provides solutions for:
ISO 9227
Customized salt spray test requirements
Advanced corrosion testing systems such as cyclic corrosion testing (CCT) upon request
This flexibility allows users to expand testing capability as standards or product requirements evolve.
Looking to verify your ASTM B117 testing process?
Need a salt spray test chamber optimized for PPGI applications?
Global technical support and spare parts
3-year comprehensive warranty covering core systems
Lifetime technical support provided by senior engineers
Rapid remote diagnostics and response within 1–3 hours
Contact LIB industry today inquiry@libtestchamber.com for expert consultation or to schedule a live equipment demonstration.
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