Can Ryton PPS still be used after it has been in a dryer longer than the recommended period of time?
We have conducted tests on drying Ryton R-4 at 300F (149C) and found that the initial melt flow of 28.7 g/10 min varied from a low of 26.0 g/10 min to a high of 30.0 g/10 min, up to 96 hrs. If, however, your drying temperature was too high (400F, 204C), the melt flow would decrease from 28.7 g/10 min to 13.9 g/10 min. Therefore, if your dryer is set at 300F (149C) or lower, you should have no problem using that material.
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