Why was asbestos used in acoustic popcorn ceiling?

Asbestos was used as a binder, a lubricant for the spray rotor/stator pump, and because of its fire proofing properties. Although outlawed in 1978 old stock was still legal and applied well into the 1980's. Asbestos was also used in the joint taping compound for finishing the drywall. Removing the acoustic does not eliminate asbestos from your home however the joint compound is typically encapsulated by texture and paint and does not present a danger.