You have to be careful about numbers. Sometimes when a manufacturer claims a percentage of carnuba, it means the % of wax in the formulation is that percentage pure (carnuba). No formula can be 100% carnuba or even close to it. Carnuba is a hard brittle wax, and has to be melted and added to a companies formulation to stay suspended in solvents. If a company does claim 100% carnuba wax, it means that the wax in the product is 100% pure. Forrest from mothers puts it nicely..........
"........There is no easy answer, and most manufacturers will not even release the info. However, you shouldn't get caught up in the percentage number.
There comes a "saturation" point in the manufacturing process. If more carnauba is added to the formulation, beyond this point, it does not increase gloss, durability or anything else. It simply inflates the number to make it sound better.
If the saturation point of carnauba in a given formula (given many variables like solvent type used, fillers, cleaners, etc) is 14%, then it does no good to put 15, 20, or 50% carnauba. You derive no benefit from the added carnauba content except to say mine is bigger, faster, more expensive than your's.
It's simply a numbers game.
Since different formulae have differing thresholds, a comparison between them based solely on percentage content is meaningless......."