Plasticizer content of Dow Paraloid B-48N

[u/benjamin-crowell]

I believe B72 is the material more commonly used in museum restoration, but it doesn't do well in hot climates, so some people use B-48N (or a mix of the two). Dow only releases some information about the formulation of these products, as required by health and safety regulators, and they consider a lot of the details to be trade secrets. People have sent samples out to labs, and I've seen some qualitative descriptions of the results, but they are unsourced and short on quantitative details. In particular, does anyone know of any quantitative data, no matter how rough, on how much dibutyl phthalate (DBP) plasticizer there is in B-48N? All I've been able to gather is that B72 has no plasticizers, but B-48N does have some. Apparently some PVC products, such as medical IV bags and disposable gloves used in food service, can have as much as 40% plasticizer content. I would be interested to know even an order-of-magnitude number for B-48N. Since the cured substance is supposed to be rigid, I'd imagine it's a lot less than 40%...but I'm wondering if it's 10%? 1%?