ISO 9022

Hi all,

Wish to get help from here.

I am trying to interpret the ISO 9022-12 contamination. I have no idea how does it needed to to be done.

For example : ISO 9022-87-02-1

Do I tested with each test agent for 120mins (total 720mins for 6 agent) or dip the test pad with all the 6 agents and one time test for 120mins?