Round Robin Tests to Determine Fiber Content of Carbon Fiber-Reinforced Thermoplastic Composites by Combustion and Thermogravimetry

Table 5

Calculated fiber content of CFRTP with 9 plies after resin removal by thermogravimetry.

Organization	Number of specimens	Initial weight (mg)		Weight after step 3 (mg)		Weight after step 5 combustion (g)		Fiber content in weight (%)		Apparatus
		Average	Standard deviation	Average	Standard deviation	Average	Standard deviation	Average	Standard deviation	Company	Code
A	4	9.9813	0.7107	6.1136	0.0992	–0.0336	0.0876	61.587	0.775	SII	TG/DTA 6200
B	1	10.2490	—	6.2790	—	0.1090	—	60.201	—	Hitachi High-Technology GLOBAL	STA 7300
C	3	5.1997	0.0940	3.3480	0.0246	0.1100	0.1012	62.299	2.148	Rigaku Corporation	TG 8120
D	3	20.0600	0.1497	12.3881	0.1353	0.0000	0.0000	61.754	0.300	ULVAC RIKO Inc.	TGD-9600
E	5	10.1700	0.2194	6.3700	0.3742	0.4240	0.8217	61.073	0.420	Rigaku Corporation	TG-DTA
F	5	9.5084	0.2246	5.6500	0.0866	–0.1961	0.1676	61.484	1.292	Rigaku Corporation	TG-DTA
G	3	17.0867	3.0766	10.7170	1.9514	0.0260	0.0200	62.555	0.195	Hitachi High-Technology GLOBAL	STA 7300
H	3	11.4332	1.6052	6.9750	1.0769	–0.0823	0.1304	61.678	1.896	Rigaku Corporation	Thermo Plus EVO2
Total	27	12.2109	4.8670	7.5088	3.0437	–0.0278	0.1360	61.668	1.155	—	—
Interlaboratory	8	11.711	4.379	7.230	2.722	0.045	0.171	61.579	0.678	—	—