Acoustic Insulation Burnthrough The Oil Burner Test for thermal/acoustic insulations evaluates the burnthrough resistance of thermal and acoustic insulation materials when they are exposed to a high-intensity flame to show compliance with the requirements of 14 CFR § 25.856(b). Powerplant Firewalls Magnesium Alloys Powerplant Fuel Systems Cargo Liner (Flame Penetration) Request Testing Request Information