I don't have the knowledge or experience to comment on the use of foam versus other materials for fire safety, but I remember reading a post on some forum quite a while back, and found an old bookmark about it.
If you follow the link, someone did some informal tests on blue/pink foam versus white styrofoam. After reading the information, I am very leery of using white styrofoam products.
foam flammability
I just had another thought, what about all the product boxes stored under the layout by many hobbyists? Many of the boxes have white styrofoam packing materials.
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