I've noticed recently that there is a lot of incorrect or outdated information regarding wood pallets. My company makes dozens of pallets each day so I thought I would clear the air...
More companies are starting to build one-time-use pallets or use heat treatment rather than Methyl Bromide fumigation. Pallets now require an IPPC logo which certifies that the pallet was heat-treated or fumigated with Methyl Bromide.
The standard is a 2 letter country code (xx), a unique number (#####) assigned by the National Plant Protection Organization (NPPO), HT for Heat Treatment or MB for Methyl Bromide, and DB to signify debarked.
The logo in the first image shows that it was produced in the U.S., the material was provided by 11187 (Unique number assigned to the producer), it was heat treated (HT) and was verified by PRL (Package Research Laboratory)
There are some additional codes that can go on pallets but the main one to watch out for is MB. It means it was treated with Methyl Bromide.
If you don't see an IPPC logo then you know not to use it. While a pallet may be perfectly safe without the logo, it could also mean it was treated with chemicals.
Another issue is what has spilled on the pallet. I'd be careful, personally, about oily pallets or ones that have clearly had something spilled on them.
Source:minnecrapolis (via a Facebook post from "Repurposing 24/7").