Brook One fire barrier cover film has underwent mandatory Federal Aviation Administration (FAA) testing for Flammability and Burn Through.

Brook One fire barrier product has surpassed all fire testing requirements as established by the FAA, including

• FAR 25.856 (a) – Flammability
• FAR 25.856 (b) – Burn Through (Click here for Video)

FAR 25.856 provides guidance for installation and test method of thermal/acoustic insulation.

The purpose of Burnthrough test is to evaluate fire barrier resistance properties of thermal and acoustic insulation material when exposed to a high-intensity open flame.

FAA testing burnthrough requirement is 4 minutes or longer, and heat flux reading of less than 2 BTU/ft2-s. But in fact, Brook One has tested heat flux reading less than 2 BTU/ft2-s for 10 minutes in some cases, exceeding FAA Testing Requirement by at least 6 minutes! Also, during the stringent testing, Brook One products illustrated no flame penetration for 25 minutes! – Brook One Material Burnthrough Testing at AccuFleet Lab
5.6.7* – Brook One Insulation Blankets Tested at FAA Lab
(*5.6.7 Source: FAA Insulation Burnthrough Round Robin 2017 – Figure 27.28.29)




Brook One burnthrough cover film products feature long “no burnthrough” time with low heat flux readings. According to FAA regulation, if heat flux reaches 2 BTU/ft2-s in 4 minutes, the product fails the test. Our products last much longer than 4 minutes, and heat flux readings are kept at low levels (e.g. 0.3 BTU/ft2-s in 8 minutes). 3 Runs Heat Flux Results are as follows:




FAR 25.856 (a) requires thermal/acoustic insulation/cover film/material installed in the fuselage to meet flame propagation test (Radiant Panel Test). This test requires consideration of 2 parameters: as pass/fail criteria – flame propagation & flame time after removal of ignition source. The criteria adapted was essentially that the specimen did not ignite, which is specified by not allowing any flaming beyond a 50mm (2 inch) length from the point of flame application and no continued flaming after the removal of the pilot flame.