I have no idea but casual reseach indicates it is 99% sand and water and that companies are reluctant to release exact formulations.
More and more are becoming available online.
MSDS sheets of individual components available at the link.
That’s my understanding too. And if it were ONLY sand and water, we probably wouldn’t be talking about it.
I have found out the following.
Fracking was granted explicit exemptions from the Safe Drinking Water Act, the Clean Air Act, and the Clean Water Act.
Frackers are allowed to pump millions of gallons of fluid containing toxic chemicals into the ground without having to identify them.
Substances used include benzene, ethylbenzene, toluene, boric acid, monoethanolamine, xylene, diesel-range organics, methanol, formaldehyde, hydrochloric acid, ammonium bisulfite, 2-butoxyethanol, and 5-chloro-2-methyl-4-isothiazotin-3-one.
I don’t want these things in the water that my family drinks.