ASTM B368 CASS Corrosion Test Chamber

Model DR-H304-6 is intended for accelerated evaluation of decorative copper-nickel-chromium, nickel-chromium and suitable anodized aluminum coating systems under controlled CASS salt-fog conditions.

CASS means copper-accelerated acetic acid salt spray. Copper chloride and acetic acid are added to the sodium-chloride solution to create an aggressive, acidic fog environment. The method is especially useful for exposing pores, discontinuities and weak areas in decorative electrodeposited coatings.

ASTM B368 was developed specifically for decorative nickel/chromium and copper/nickel/chromium coatings. ISO 9227 also defines CASS apparatus, reagents and operating procedures, including assessment of cabinet corrosivity. Neither standard establishes one universal exposure duration, specimen geometry or acceptance limit; those requirements must come from the product, coating or customer specification.

Do not describe the result as “four to eight times faster than NSS.” Acceleration varies by coating system and the methods can produce different corrosion mechanisms, so a fixed conversion factor is not technically defensible.

CASS exposure conditions below describe the test method. Select the chamber temperature, solution system and corrosion-resistant components together for the required procedure.

1. Identify the governing document.
   Record the exact standard edition, product specification, exposure duration and evaluation method.
2. Verify chamber capability.
   Confirm CASS chemistry compatibility, cabinet controls, collection system and required utilities.
3. Prepare specimens consistently.
   Clean, mask and mount parts only as required by the applicable specification.
4. Verify solution and fog.
   Record reagent preparation, pH, temperature, collection rate and cabinet-corrosivity checks.
5. Control interruptions.
   Document door openings, replenishment, alarms and any deviation that could affect results.
6. Evaluate to the product method.
   Report defects, rating method and acceptance decision without converting chamber hours into service years.

Prevent contamination between test methods

Residual copper and acid can affect subsequent NSS or AASS work. If one cabinet will run several chemistries, obtain a documented cleaning and verification procedure and determine whether your laboratory quality system permits method sharing.

Maintain the fog path

Inspect nozzles, solution filters, collectors, saturator, compressed-air treatment and drains. Deposits or blocked components can change fog distribution even when the controller display appears normal.

Handle CASS solution responsibly

CASS solution is acidic and contains copper. Provide appropriate personal protective equipment, ventilation, spill controls and waste disposal based on the safety data sheets and local regulations. Do not discharge solution without an approved disposal process.

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Include the chamber, specimen supports, fog atomization and collection accessories, solution reservoir, temperature controls and selected records in the offer. Define the buyer-supplied compressed air, water, exhaust and drain connections separately. A programmable spray timer does not by itself provide active drying or controlled-humidity corrosion stages.

Dedicated copper-accelerated acetic acid salt spray for decorative plated finishes.

Available project options include custom corrosion-resistant holders, additional loading arrangements, solution handling, data recording and automated operating sequences. For cyclic corrosion, specify each wet, dry and humidity stage so the proposal includes the required conditioning hardware, not only a change to the timer.

Use the agreed rack arrangement to check access and clearances. Witness temperature stabilization, fog collection at the selected positions, solution handling and controller timing. Record instrument identification, the test interval and the selected chemistry. Collection measurements and specimen evaluation are different records; neither should be replaced by a photograph of an empty cabinet.

Compare the DERUI equipment range

1200L Programmable Salt Spray Chamber DR-H304-200 · 800L Salt Fog Test Chamber DR-H304-160

Plan factory acceptance and the equipment record.

Send the following information together so the proposed equipment, accessories and acceptance scope match your test:

• Coating system and sample geometry
• ASTM B368 or ISO 9227 edition
• CASS solution handling
• collector layout
• cleaning and acceptance records

List the required fixtures, measurement channels, data records and installation services separately in the quotation. Agree the representative specimen arrangement and pass criteria before the equipment acceptance run.