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ASTM B368 CASS Test Chamber – M Series Size 15L

ASTM B368 CASS Test Chamber – M Series Size 15L

The Auto Technology M Series Size 15L CASS salt spray chamber is a compact, water-jacket-heated chamber configured with the High Temperature Package for copper-accelerated acetic acid salt spray testing. The configuration supports ASTM B368 and ISO 9227 CASS operating conditions.

  • Internal Volume: 12 ft³ (339 L)
  • CASS Temperature Capability: High Temperature Package for the elevated chamber and humidifying-tower conditions required by the selected method
  • Salt Spray System: Conditioned atomizing air, corrosion-resistant atomizer, and baffled salt spray distribution
  • Related Standards: ISO 9227 CASS, JIS H 8502 CASS, and GB/T 10125 CASS

ASTM B368 and ISO 9227 specify different CASS temperature and solution requirements. Configure and operate the chamber to the exact standard and revision governing the product being evaluated. Additional M Series sizes are available.

SKU: MSERIES-15L-CASS Categories: , Tags: , ,

Description

The Auto Technology M Series Size 15L CASS salt spray chamber, equipped with the High Temperature Package, is configured for copper-accelerated acetic acid salt spray testing under ASTM B368 and the CASS method of ISO 9227. The chamber combines indirect water-jacket heating, conditioned atomizing air, baffled salt spray generation, and a corrosion-resistant exposure zone in a compact 12 ft³ (339 L) platform.

CASS testing uses an acidified sodium chloride solution containing copper chloride and operates at a higher chamber temperature than neutral salt spray or acetic acid salt spray. The High Temperature Package allows the M Series to operate at the elevated chamber and humidifying-tower conditions associated with these methods.

M Series Size 15L Configuration

  • Model: M Series Size 15L
  • SKU: MSERIES-15L-CASS
  • Internal Volume: 12 ft³ (339 L)
  • Exposure Zone: 22.65 × 30.27 × 29.64 in (57.5 × 76.9 × 75.3 cm)
  • Chamber Dimensions: 37 × 42 × 52 in
  • Chamber and Tank Footprint: 73 × 42 × 52 in
  • Solution Tank: External 55-gallon tank with air agitation
  • Required CASS Configuration: High Temperature Package
  • Heating Architecture: Indirect water-jacket chamber heating with conditioned atomizing air

Auto Technology M Series Size 15L CASS salt spray chamber

M Series Size 15L: Compact steel salt spray chamber available with the High Temperature Package for ASTM B368 and ISO 9227 CASS operation.

ASTM B368 CASS Salt Spray Conditions

ASTM B368 specifies copper-accelerated acetic acid salt spray conditions for evaluating decorative nickel/chromium and copper/nickel/chromium coatings and anodized aluminum. The product specification determines the applicable exposure period and acceptance criteria.

Parameter ASTM B368 Requirement
Exposure-zone temperature 49 ±1 °C
Base salt solution 5 parts sodium chloride by weight in 95 parts ASTM D1193 Type IV water
Copper chloride addition 0.25 g CuCl2·2H2O per liter
Collected-solution pH 3.1 to 3.3, measured electrometrically at 25 °C
Collected sodium chloride concentration 4.5% to 5.5% by mass
Spray collection rate 1.0 to 2.0 mL/h for each 80 cm² horizontal collecting area, based on a typical run of at least 22 hours
Operation Continuous salt spray unless the governing product specification states otherwise

ISO 9227:2022 CASS Salt Spray Conditions

ISO 9227 covers neutral salt spray, acetic acid salt spray, and copper-accelerated acetic acid salt spray as separate methods. The following values apply specifically to the ISO 9227 CASS method.

Parameter ISO 9227:2022 CASS Requirement
Exposure-zone temperature 50 ±2 °C
Sodium chloride concentration 45 to 55 g/L; collected solution 50 ±5 g/L
Copper chloride addition 0.26 ±0.02 g/L CuCl2·2H2O
Collected-solution pH 3.1 to 3.3 at 25 ±2 °C
Average collection rate 1.5 ±0.5 mL/h for an 80 cm² horizontal collecting area
Collection-rate measurement Measured over a minimum of 24 hours of continuous spraying

How the M Series Produces the CASS Salt Spray Environment

  • High Temperature Package: Configures the chamber for the elevated exposure-zone and humidifying-tower temperatures used by CASS methods.
  • Indirect water-jacket heating: Controls cabinet temperature without placing an exposed heater directly in the test space.
  • Conditioned atomizing air: The bubble tower heats and humidifies clean compressed air before it reaches the atomizer.
  • Baffled salt spray distribution: The atomizer and dispersion system generate a distributed salt spray environment without directing spray onto the specimens.
  • Anti-drip cover geometry: Limits condensate from the chamber cover falling directly onto test specimens.
  • External solution supply: The 55-gallon agitated tank supports solution mixing and delivery to the salt spray system.

Exposure zone inside an Auto Technology M Series Size 15L CASS salt spray chamber

Size 15L exposure zone: Compact chamber space for coated panels, plated components, coupons, connectors, and other appropriately sized specimens.

CASS Salt Spray Chamber Contamination Control

CASS solution contains copper chloride and acetic acid. ISO 9227 notes that a cabinet used for CASS can be difficult to clean sufficiently for subsequent NSS or AASS operation. Residual copper can alter the corrosivity of later exposures.

A dedicated CASS salt spray chamber is therefore the preferred configuration for laboratories performing routine CASS work or maintaining tightly controlled NSS and AASS programs. If a chamber is changed between methods, the cleaning, collected-solution verification, and cabinet-corrosivity verification requirements of the applicable standard must be followed.

CASS and Related Salt Spray Standards

The M Series Size 15L with the High Temperature Package can be configured around the following CASS procedures:

  • ASTM B368 — Copper-Accelerated Acetic Acid-Salt Spray (Fog) Testing
  • ISO 9227 CASS — Copper-Accelerated Acetic Acid Salt Spray
  • JIS H 8502 CASS — Corrosion-resistance testing for metallic coatings
  • GB/T 10125 CASS — Copper-accelerated acetic acid salt spray testing

The High Temperature Package is also used in certain elevated-temperature modified salt spray procedures, including ASTM G85 Annex A2 and Annex A3. These are separate methods—not CASS—and the chamber controls and operating sequence must be configured to the specific annex being performed.

Configure the Salt Spray Chamber to the Governing Standard

Specify the exact standard, revision, specimen dimensions, loading arrangement, exposure duration, electrical service, exhaust configuration, and whether the chamber will be dedicated to CASS. Auto Technology can then confirm the final Size 15L configuration and required option package.

Additional M Series salt spray chamber sizes are available for larger specimens and higher testing throughput.

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