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

Table 2

Calculated fiber content of the CFRTP with 9 plies after resin removal by combustion according to ISO 14127.

Organization	Number of specimens	Initial weight (g)		Weight with wire (g)		Weight after combustion (g)		Fiber content in weight (%)
		Average	Standard deviation	Average	Standard deviation	Average	Standard deviation	Average	Standard deviation
A	5	0.32436	0.00297	0.36034	0.00350	0.23474	0.00393	61.279	0.261
B	5	0.31903	0.00408	0.35990	0.00434	0.23580	0.00261	61.101	0.157
C	5	0.32410	0.00236	0.35404	0.00242	0.22764	0.00107	61.002	0.256
D	3	0.32455	0.00199	0.36442	0.00209	0.23810	0.00339	61.082	0.407
E	3	0.32247	0.00102	0.34893	0.00696	0.22253	0.00625	60.802	0.261
F	3	0.32291	0.00539	0.83230	0.05987	0.70320	0.06174	60.028	0.538
G	3	0.31970	0.00417	0.36330	0.01383	0.23907	0.01234	61.143	0.330
H	3	0.32203	0.00272	0.39320	0.00545	0.26443	0.00242	60.020	0.600
I	3	0.32167	0.00125	0.38700	0.00245	0.26300	0.00707	61.447	1.672
J	3	0.32107	0.00333	0.38653	0.00836	0.26223	0.00651	61.287	0.199
K	3	0.32297	0.00208	0.37904	0.01112	0.25272	0.01276	60.889	0.362
L	5	0.32298	0.00189	0.34562	0.00201	0.22252	0.00129	61.887	0.337
M	5	0.32144	0.00295	0.36070	0.00294	0.23604	0.00145	61.220	0.340
N	5	0.32338	0.00230	0.37468	0.00747	0.25030	0.00793	61.537	0.570
O	5	0.32365	0.00179	0.38249	0.00141	0.25691	0.00200	61.201	0.286
P	5	0.32286	0.00453	0.36392	0.00787	0.23838	0.00580	61.120	0.299
Q	3	0.32433	0.00125	0.37333	0.00189	0.24833	0.00245	61.459	0.002
Total	67	0.32278	0.00324	0.38813	0.09803	0.26265	0.09726	61.129	0.657
Interlaboratory	17	0.323	0.002	0.396	0.110	0.270	0.109	61.088	0.461