Passive Corrosion Monitoring

Corrosion Classification Coupon

The Corrosion Classification Coupon (CCC) measures the amount of corrosion that forms on copper and silver surfaces. This provides data allowing an industry standard classification of the amount of corrosion present, as well as identifying contaminant classes. Because many contaminants are corrosive in nature (e.g., hydrogen sulfide and sulfur dioxide), reactivity monitors have long been used to gauge the quality of ambient air and to indicate the effectiveness of pollution control strategies. Purafil’s CCC is a passive reactivity monitoring technique involving the use of copper and silver.

Typical CCC Installation Sites

Industrial and Mission Critical Environments:

Control Rooms, Rack Rooms, Motor Control Centers, Data Centers, Server Rooms, and Critical Parts Storage Rooms.

Museum and Library Environments:

Recirculation Air Handlers, Storage Rooms, Display Cases, Archives, and Historic Houses.

Clean Room Manufacturing Environments:

Semiconductor, HDD, LED, and more.

Customer Benefits

Unobtrusive, easy installation and data gathering
Economical investment for determining air quality
Scientifically supported, reliable results
Provides the documentation required for manufacturers’ warranty compliance
Vital for determining corrective solutions to protect equipment, processes, and artifacts

Copper and Silver Analysis

After an installation period of 30 days, the CCCs are collected from the field and returned to Purafil’s laboratory for analysis. The purpose of CCC analysis is to determine the type and thickness of corrosion films on the surface of each metal coupon. A normalized 30-day reactivity rate is calculated using the amount of time the metal coupon is exposed and the thickness of the corrosion that has formed.

ISA Environmental Classes: Airborne Contaminants

This standard requires that rooms containing backplane wired equipment, instrumentation, process control systems or computers, must have a G1 environmental classification, defined in terms of corrosion thickness as 0-299 Angstroms (Å) per 30 days on copper and 0-199 Å per 30 days on silver coupons. Purafil provides a report that directly correlates to the G1, G2, G3, and GX ratings.

ISA STANDARD ANSI / ISA-71.04-2013
Severity Level	Copper Corrosion	Silver Corrosion
G1 – Mild	<300 Angstroms / 30 days	<200 Angstroms / 30 days
G2 – Moderate	<1000 Angstroms / 30 days	<1000 Angstroms / 30 days
G3 – Harsh	<2000 Angstroms / 30 days	<2000 Angstroms / 30 days
GX – Severe	>2000 Angstroms / 30 days	>2000 Angstroms / 30 days

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Corrosion Classification Coupon+

The Corrosion Classification Coupon + (CCC+) measures the amount of corrosion formation on copper and silver surfaces and logs the temperature and relative humidity of the immediate environment. This provides data allowing an industry standard classification of the amount of corrosion present as well as identifying contaminant classes.

Because many contaminants are corrosive in nature (e.g., hydrogen sulfide and sulfur dioxide), reactivity monitors have long been used to gauge the quality of ambient air and to indicate the effectiveness of pollution control strategies. The CCC+ also contains a temperature and relative humidity logger for evaluation of controls and limits.

Typical CCC Installation Sites:

Industrial and Mission Critical Environments

Control rooms
Rack rooms
Motor control centers
Data Centers
Critical parts storage rooms
Server rooms

Museum and Library Environments

Outside air intakes
Recirculation air handlers
Storage rooms
Display cases
Archives
Historic Houses

Customer Benefits:

Unobtrusive, easy installation and data gathering
Economical investment for determining air quality
Scientifically supported, reliable results
Provides the documentation required for manufacturers’ warranty compliance
Vital for determining corrective solutions to protect equipment, processes, and artifacts

Copper and Silver Analysis:

Temperature and Relative Humidity

Temperature should be maintained consistent with electronic equipment warranty requirements or at the lowest level possible consistent with personal comfort, typically 72°F, 22°C (±2°F, ±1-2°C). Relative Humidity should be less than 50% with close control of deviations, no greater than 6% per hour. Features	CCC		CCC+
Copper Corrosion Analysis	Yes		Yes
Silver Corrosion Analysis	Yes		Yes
Summary Report	Yes		Yes
Temperature Analysis		Yes
Relative Humidity Analysis		Yes