I've made a few parts for my motorcycle project using vacuum infusion and the products available from easy composites and am moving on to the seat now. I need to make the seat pan between 10 and 12 mm thick so it is self supporting, I.e. no metal subframe. The items I've made so far probably peak at 4mm thick. Can I make a 10mm thick part in a single infusion or is the technique to get to 10-12 mm thick achieved by running successive infusions of smaller thickness? Grateful for any experience people might have on making thicker parts.
Thanks 😉

10-12 mm solid laminate are definitely overkill for this application. This would be so heavy that a steel subframe should be lighter. And incredible expensive btw.
Your seat should be easy closed structure, I guess. if so, way less wall thickness should be sufficient. I can't give you a actual number, but it should be something around 2-3mm at the base, and less and less up to the tip.
And if you really have an open structure, the main problem should be the bending and torsion forces. And for this cases, a sandwich construction would be advantageous. You can infuse sandwich parts with a soric core.
If you aren't building industrial parts like wind turbine blades, over 10mm solid laminate would never be necessary. Even over 5mm.