Placards on reefers

Hauling them together is forbidden, but hauling a food load after hauling a hazmat load is fine, as long as there wasn't any type of leakage. And putting that placard on the trailer means more money to haul it because of the increased risk.

 

Some aircraft paints/resins require refrigeration.

 

It does; I've hauled paint and other stuff in reefers.

That's one good reason to be a reefer driver. Can haul refrigerated loads, dry van loads, hazmat loads in reefer trailers.
I was never stuck anywhere because of no loads available.
One time in Ohio, there were 5 of us from the same company that unloaded. I was the only one with hazmat endorsement.
Dispatcher had a load of paint going to California and I got it.

 

You would be amazed at the number of food ingredients that are listed as hazardous and require placards. And some require temperature controls in a very narrow band to remain viable.

 

Phosphoric acid

 

The type of HM going in reefers is palletized. They don't just put open vats of chemicals sloshing around and spilling on the floor. A few years ago the FMCSA added some washout regs, but I didn't do reefer long enough to encounter them, it just felt like forever. Customers are usually more strict on washouts than the FMCSA regs anyway.

 

The regs don't allow HM classified as Poison to be loaded with food or products destined for human consumption. There is a HM Segregation Chart you can find in the regs or online. It lists all kinds of restrictions on what can be carried with what else.

 

I hauled corrosives for 3 years. I worked for one chemical company and all I ever hauled was phosphoric acid, a corrosive HM in a tanker. Phosphoric acid comes in many "flavors" Lots of the customers for phosphoric acid are paving/asphalt producers, oil companies, and bread/food producers. Phosphoric acid is in many soft drinks. Our tanker trailers were washed out thoroughly after hauling phosphoric acid unless it was going to be reloaded with the exact same flavor of phosphoric acid when it returned.

Tanker customers have an elaborate set of requirements on the tanks they load/receive chemicals. The food-grade people also have many rules on the trailers they ship/receive product. Hardly anything in trucking isn't fully regulated. It all becomes much more clear after you start hauling stuff. If someone were to list all the requirements and procedures involved it could quickly read like describing brain surgery. Just as if someone tried to describe all the things a new teen driver needs to look for when driving (traffic signals, multitude of road signs, customer signs, traffic hazards, etc) it seems far more overwhelming than it feels in practice.

 

Regarding hazmat loads on reefer,,do it all the time..annoys me when the paper placards dissolve in the rain(last night) and I got to get the crayons out