Actuary tables for electonic equipment

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Comments:
         : My client's electronic/electrical equipment operates in industrial environments.

: We need some kind of "actuary" table that correlates diverse factors, such as airborne contaminants (Chlorine, sulfides, dust), humidity, humidity cycling, temperature, and air velocity.

: Insurance underwriters have such handy rough-and-ready rules of thumb for the human frame! Where can we find a similar servicable SWAG for machinery?

: Thanx!