flame resistance aluminum honeycomb cleanroom panel Aluminum Honeycomb Core has core diameter of P180 and lower 19∮. Its core material is light with nonflammable feature. Primary used in the cleanroom system. Panels are comprised with Germany high standard adhesives. The adhesive is non-outgassing and non-pollutions with zero chemical reaction under flame resistance PU panel‧flame resistance paper honeycomb cleanroom panel‧1 and 2.5 hours fire rated rock-wool panel