there's no such thing as 85% rejection.
the "real" measurement come in TSER, and even the best tinted film (top of the range, like VKool, Ecotint), come around 60%-65% TSER.
Tinted film range around RM500 will have 30-35% TSER max, apply to all kind of tinted film. IR rejection is not the entire heat rejection, ask for TSER. Many dealer don't tell the entire truth, they only tell you half/part of the story.