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See Chinese contents: GB/T 6504-2017 GB/T 6504-2017: Man-made fiber -- Test method for oil content
This Standard specifies the test method for oil content of man-made fiber: extraction method (Method A), neutral soap solution washing method (Method B), optical refractive index method (Appendix A), nuclear magnetic resonance method (Appendix B), rapid extrusion method (Appendix C). This Standard is applicable to polyester (dacron), polyamide (chinlon), polyacrylonitrile (acrylic), polypropylene (polypropylene), polyvinyl formal (vinylon), regenerated cellulose fiber (rayon); other type of man-made fibers can refer to.
