What are the gaseous corrosivity levels

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According to ANSI/ISA-71.04-2013 Environmental Conditions for Process Measurement and Control Systems: Airborne Contaminants, the gaseous corrosivity levels are G1 (mild), G2 (moderate), G3 (harsh), and GX (severe)

Other related questions:
Environmental corrosion level requirements of storage products
1. The corrosion rate of the copper test wafer is lower than 300 ?b per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. 2. The corrosion rate of the silver test wafer is lower than 200 ? per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. You are advised to ask a professional organization to monitor environmental corrosion levels in the equipment room.

What's the concentration level of corrosive airborne contaminants in a data center
The concentration level of corrosive airborne contaminants in a data center shall meet the requirements listed in the white paper entitled Gaseous and Particulate Contamination Guidelines for Data Centers published in 2011 by American Society of Heating Refrigerating and Air-conditioning Engineers (ASHRAE) Technical Committee (TC) 9.9. According to the Guidelines, corrosive airborne contaminants in a data center shall meet the following requirements: Copper corrosion rate Less than 300 ?/month per ANSI/ISA-71.04-2013 severity level G1. Silver corrosion rate Less than 200 ?/month.

Reasons of disk corrosion
Disks are integrated electronic mechanical devices. They have printed circuit boards (PCBs) which easily corrode in the corrosive environment. (Similar electronic devices have the same corrosion risk).

Ideal environments to prevent disk corrosion
Disks need to run in environments meeting the following requirements: 1. The corrosion rate of the copper test wafer is lower than 300 ? per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. 2. The corrosion rate of the silver test wafer is lower than 200 ? per month in compliance with ANSIc/ISAd-71.04 environmental corrosion G1 level. If disks run in environments whose corrosion level is worse than G1, disks may corrode. Environment requirements for normal disk running have been described in the product documentation.

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