id	keyword
brj-23121	flame
brj-23121	retardant
brj-23121	char
brj-23121	et al
brj-23121	wood
brj-23121	group
brj-23121	doi
brj-23121	flame retardant
brj-23121	acid
brj-23121	article
brj-23121	urea
brj-23121	smoke
brj-23121	heat
brj-23121	release
brj-23121	pan-6
brj-23121	layer