Table 1.

Overview of samples and average data on key physical chemical characteristics

Sample code	NRCWE ID number	Product form	Particle sizea	BET specific surface area	Total pore volume	TGA mass loss	Main elemental impurities	ng endotoxin/mg particlec
CNT	NRCWE-026	Powder	11 ± 4 nm (diameter) 4+/− 0.4 μm (length)	246 m2/g	0.80 cm3/g	87 %	Al, Fe, Cob	BD
EPOXY-REF	NRCWE-034	Sanding dust	ND	4.53 m2/g	0.005 cm3/g	99 %	ND	3.43E-05
EPOXY-CNT	NRCWE-035	Sanding dust	ND	2.45 m2/g	0.003 cm3/g	99 %	ND	4.12E-06
EPOCYL	NRCWE-036	Sanding dust	ND	2.65 m2/g	0.003 cm3/g	99 %	ND	BD
CB		Powder	14 nmd	295−338 m2/ge	ND	ND	N (0.82 %), H(0.01 %)e	3.33E-03

ND not determined, BD below detection limit

^aAverage particle dimensions by SEM; ^bMain elemental impurities as determined by ICP-MS [6]; ^cEndotoxin content in particles/dust determined by Limulus Amebocyte Lysate test; ^dAccording to manufacturer’s data; ^e [26] and [27]