From the plans
The RV-6 plan sheet 25 calls out Type 304 18-8 stainless steel 28-26 ga. for the firewall.
That would make it 0.015 to 0.018 inch thick.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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