Research Article
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 | — | — |
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