I believe what you're looking for is the code for Dangerous and Hazardous (which are mostly chemicals as you said). These are four digit numbers appearing on placards on the side of trucks and they and they range from 1001 to 9279
Hope this helps.
Okay I have an answer for you. You can either accept my question for the $15, or you can email firstname.lastname@example.org and have them change the value of the question and you can accept it at the lower value.
Again, thank you so much for offering to send something my way!