There is no law that dictates how much fluid overfill can be done in saline breast implants. That is completely up to the judgment of the implanting surgeon. The manufacturer lists recommendations for each implant size but that is not an absolute number.
There is no law regarding this.You can overfill as much as you want but at some point they will break, so that's why there is a range. Overfilling or underfilling is NOT recommended and may void the warranty.