Quality Control Practices Quality Control - Page 2 Determination of Fiber Content 1. Perform a normal sieve analysis procedure in accordance with ASTM D5644-18 Standard Test Method. 2. As the test screens are disassembled, there may be free fabric in the form of bundles of fibers or “fabric balls” which can be removed from each screen level. 3. Accumulate the “fabric balls” as the screens are disassembled. 4. Weigh the “fabric balls” using a similar method used for the metal weighing procedure. Determine the weight in grams +/- 0.1 g. 5. Because the sample used is 100 grams, the mass recorded for the “fabric balls” represents the percentage of the fabric in the sample. 6. The “fabric balls” may entrap very small particles of rubber. It is permissible to attempt to dislodge these particles by shaking the “fabric balls” or dropping them on a clean surface. Weighing the “fabric balls” with entrapped rubber will tend to distort the fabric content to the higher value. 7. Report the result to the nearest 0.1 g.
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