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An angled, front-left view of the Auto Technology C Series corrosion test chamber, showing the integrated touch screen controller, air pressure gauge, and durable fiberglass construction.

CASS Test Chamber – C Series Size 20

The Auto Technology C Series Size 20 is a fiberglass AASS salt spray chamber providing approximately 20 ft³ (594 L) of usable test volume. It is configurable for continuous exposure under ISO 9227 AASS and JIS Z 2371 AASS, with touchscreen controls, an integrated solution reservoir, conditioned atomizing air, and baffled fog distribution.

  • Supported Standards: ISO 9227 AASS and JIS Z 2371 AASS
  • Exposure: Continuous fog at 35°C ±2°C
  • Test Solution: 50 g/L ±5 g/L sodium chloride acidified with acetic acid
  • Fog System: Venturi atomizer with conditioned compressed air and a baffled dispersion tower
  • Control System: 6-inch touchscreen for chamber temperature, bubble-tower temperature, fog operation, timing, status, and alarms
  • Solution Storage: Integrated 60-gallon reservoir

This product is configured and marketed for AASS testing. The same C Series platform can be configured for NSS, CASS, ASTM G85 Annexes A1, A2, A3, and A5, simple fog/dry cycling, and condensing humidity.

SKU: ASERIES20-ASTM-G85-1-1-1 Categories: ,

Description

The C Series Size 20 Copper-Accelerated Acetic Acid Salt Spray Chamber is a fiberglass corrosion chamber for continuous CASS testing under ISO 9227 CASS and JIS Z 2371 CASS. It provides approximately 20 ft³ (594 L) of usable test volume and controls the required solution delivery, conditioned atomizing air, fog distribution, chamber temperature, and exposure timing.

Auto Technology C Series Size 20 CASS test chamber
C Series Size 20 CASS chamber with touchscreen controls, integrated solution storage, and a non-corrosive fiberglass cabinet.

Copper-Accelerated Fog
Continuous acidified salt fog containing the specified concentration of copper(II) chloride dihydrate.

50°C Exposure
The fiberglass chamber maintains the ISO 9227 and JIS Z 2371 CASS exposure-zone temperature of 50°C ±2°C.

Verified Corrosivity
The chamber supports reference-panel verification using the 24-hour CASS steel mass-loss requirement.

Request a CASS Chamber Quote

Provide the required standard and revision, specimen dimensions, loading quantity, exposure duration, evaluation requirements, and available facility utilities.

CASS Exposure Profile

CASS combines an acidic salt solution with copper chloride acceleration and a 50°C chamber temperature. Those three conditions distinguish it from both neutral salt spray and AASS.

Standards ISO 9227 CASS and JIS Z 2371 CASS
Exposure sequence Continuous salt spray throughout the prescribed test period
Chamber temperature 50°C ±2°C
Collected-solution pH 3.1-3.3 at 25°C ±2°C
Fog collection 1.5 mL/h ±0.5 mL/h per 80 cm², averaged over at least 24 h
Reference-panel verification 55 g/m² ±15 g/m² steel mass loss after 24 h

Duration comes from the governing requirement: ISO 9227 and JIS Z 2371 recommend exposure periods of 2, 6, 24, 48, 96, 168, 240, 480, 720, or 1,000 hours, but the product specification or agreement establishes the duration and acceptance criteria for the test item.

CASS Solution Chemistry

The chamber delivers a continuous fog from the specified solution. Solution preparation and collected-fog measurements remain laboratory responsibilities and are recorded with the test.

Sodium chloride:
50 g/L ±5 g/L

Exposure additive:
0.26 g/L ±0.02 g/L CuCl₂·2H₂O

Collected pH:
3.1-3.3 at 25°C ±2°C

Acid-service chamber: ISO 9227 and JIS Z 2371 warn that a cabinet used for AASS or CASS should not subsequently be assumed suitable for NSS. Acidic or copper-bearing residues can affect a neutral exposure, so dedicated chambers are appropriate when strict separation must be maintained.

Materials and Coatings Evaluated with CASS

ISO 9227 identifies CASS as useful for decorative copper-nickel-chromium and nickel-chromium coating systems and anodic coatings on aluminum. The governing product or coating specification determines whether the exposure is appropriate, how specimens are prepared, how long they are exposed, and how results are evaluated.

  • Coated panels and standardized reference specimens
  • Decorative plated components and production hardware
  • Anodized aluminum panels and components when specified
  • Comparative quality-control specimens required by a product or customer specification

C Series CASS Fog Generation

Clean compressed air is conditioned in the heated bubble tower before reaching the venturi atomizer. The aerosol passes through the tall baffled dispersion tower and enters the exposure zone as freely settling fog without direct nozzle impingement on the specimens.

Interior of C Series Size 20 CASS test chamber with baffled fog tower
C Series Size 20 interior with corrosion-resistant construction and baffled fog distribution.

Exposure Hardware

  • Molded fiberglass chamber and cover
  • Venturi atomizer and heated bubble tower
  • Tall baffled dispersion tower
  • Fog collectors for fallout-rate monitoring
  • Integrated 60-gallon solution reservoir
  • Corrosion-resistant specimen supports selected for the required load and exposure angle

Touchscreen CASS Controls

The 6-inch color touchscreen controls chamber temperature, bubble-tower temperature, continuous fog operation, test timing, manual functions, status, and alarms. Optional data logging is available for chamber operating data. Solution concentration, collected pH, fallout rate, and reference-panel mass loss are verified through the laboratory procedure.

C Series Size 20 CASS Chamber

The Size 20 provides laboratory-scale capacity for coated panels, plated components, aluminum specimens, production parts, and corrosion-control specimens. Racking is selected around specimen dimensions, loading quantity, required orientation, and open fog circulation.

C Series Size 20 CASS test chamber loaded with corrosion test panels
C Series Size 20 chamber loaded with corrosion test panels.

Usable test volume

Approximately 20 ft³

Approximately 594 liters

Base chamber footprint

Approximately 95 × 43 in

Approximately 242 × 110 cm

Solution reservoir

Integrated 60 gallons

Final installed footprint depends on exhaust routing, service clearance, utility connections, and selected options.

Other Tests Available on the C Series Platform

This product is configured for CASS. The same C Series platform can be configured for NSS, AASS, ASTM G85 Annexes A1, A2, A3, and A5, simple fog/dry cycling, and condensing humidity.

Configure the intended chemistry before purchase: Acidic and copper-bearing solutions require appropriate operating procedures and can contaminate a cabinet intended for neutral salt spray. Dedicated chambers are appropriate where strict separation must be preserved.

Configure a Size 20 CASS Chamber

Identify the required standard and revision, specimen dimensions, loading quantity, exposure duration, evaluation requirements, and available utilities.

Request Configuration Assistance

CASS Chamber FAQ

Which standards can this CASS chamber perform?

The C Series Size 20 can be configured for ISO 9227 CASS and JIS Z 2371 CASS. The laboratory must operate and document the chamber according to the exact standard and revision being reported.

How is CASS different from AASS?

Both use acidified sodium chloride solution, but CASS adds copper(II) chloride dihydrate and raises the chamber temperature from 35°C to 50°C. CASS is therefore a separate copper-accelerated exposure, not an AASS duration variation.

Does CASS include wet and dry cycling?

No. ISO 9227 and JIS Z 2371 CASS use continuous fog throughout the prescribed exposure. A programmed dry, humidity, or immersion step belongs to a different corrosion method.

How is chamber corrosivity verified?

The standards use specified steel reference specimens exposed for 24 hours. Acceptable operation requires 55 g/m² ±15 g/m² steel mass loss after 24 h. This verifies the chamber atmosphere; it is not the acceptance criterion for the customer product.

Can the same cabinet return to NSS testing?

It should not automatically be assumed suitable. ISO 9227 and JIS Z 2371 warn that residues from AASS or CASS can influence neutral salt spray. Where neutral testing must remain controlled, use a dedicated NSS chamber.

What is the capacity of the Size 20?

The chamber provides approximately 20 ft³ or 594 L of usable test volume and includes an integrated 60-gallon solution reservoir.

What information is needed for a quote?

Provide the required standard and revision, governing product specification, specimen material and dimensions, loading quantity, exposure duration, evaluation requirements, and available electrical, compressed-air, water, drainage, and ventilation connections.

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