I was willing to put up with the other chemicals as I mainly wanted to avoid the possibility of asbestos in dust all over the shop but looks like even the new generation fillers still contain some percentage of talc.
According to the verbage from bodyshopbusiness.com website:

"Talc — The original body fillers that replaced lead are filled with talc. Talc is hard clay that often has a fancy name like “magnesium silicate” but is really just mined out of the earth. Filler with talc isn’t waterproof because the talc wicks the moisture right through the repair. You know this is true because every time it rains, the water on your lawn is absorbed into the earth by the clay in the soil. If talc were waterproof, your front yard would be under water every time it rained.
Aluminum or fiberglass — Moisture-resistant fillers use aluminum or fiberglass as fill material. Neither will absorb moisture like talc does.
Mixing long strands of fiberglass into the polyester resin makes waterproof filler that’s also very strong. Why? Because the strands of fiberglass cross each other at every possible angle. However, it’s difficult to sand the very hairy filler to a smooth surface.

Using chopped-up fiberglass as fill makes for a non-talc filler that’s much easier to work with than the long stuff and is still waterproof.

Finely ground aluminum body filler is not only waterproof, but also spreads easily and gets so hard you can drill and tap it. So why doesn’t everyone use aluminum-filled body filler? Have you priced a can lately?

Plastic — Then there’s lightweight body fillers, which use microspheres as filler. Unlike pieces of talc — which are not only surrounded by the polyester resin but also absorb it — microspheres are surrounded by resin but don’t absorb any. As their name indicates, microspheres are tiny globes of plastic. Available in several sizes, they reduce the weight of the filler and speed the cure time.
Since they’re hollow plastic and won’t absorb any resin, they weigh less than a resin-soaked chunk of clay. And since they’re only surrounded by resin, there’s less resin mass for the hardener to catalyze so lightweight fillers harden faster. Because most lightweights also contain some talc, they’re not waterproof."