Test Methods

Standard and Pressurized Atlas Cell Test

The Atlas Cell test is an accelerated laboratory method used to evaluate the corrosion controlling properties of an organic coating exposed to a chemically aggressive environment.

The test method also evaluates a coating's ability to withstand a temperature gradient that exists between the internal and external surfaces of a coated substrate as found in the interior of non-insulated industrial tanks or marine vessels, which experience what is termed the "cold wall effect". Our test vessels have external cooling jackets so that the thermal gradient can be controlled.

The Pressurized Atlas Cell test is designed to simulate conditions in pressurized pipelines, treaters, and vessels. It measures the ability of the coating to withstand the temperature gradient between the internal and external surface (cold wall effect) under the influence of pressure, temperature and the internal environment. The product that demonstrates the least amount of reaction, is considered the most reliable for use in that particular service. Test can be run at pressures up to 2,000 psi and temperatures to 150°C (302°F). Tests can utilize supplied fluids and gases but generally standard mixtures are used including H2S to simulate sour service.

charter coating pressurized atlas cells
Charter Coating’s Pressurized Atlas Cells

Test Objectives:

Evaluate internal coatings and linings for tank and vessel applications for material selection
Determine and compare coating performance under simulated service conditions (sweet or sour conditions)
Qualify new coatings for a specific environment
Evaluate the cold wall effect on potential coatings used for uninsulated linings

Test Capabilities:

Internal Temperature: up to 150 °C (302 °F)
External Temperature: as low as -30 °C (-22 °F)
Pressure: up to 2,000 psi for Pressurized Atlas Cell

Test Methods:

NACE TM0174 Method A
ASTM D6943 Method B
Custom test conditions as required


Two (2) 6”x6” one-side coated panels per Standard Atlas Cell
Two (2) 8”x8” one-side coated panels per Pressurized Atlas Cell
charter coating standard atlas cells
Charter Coating’s Standard Atlas Cells
charter coating standard atlas cells

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