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Synthetic fibres such as polyamide, polyester and nylon are sprayed with an oil-based coating (spin finish or OPU) to reduce static electricity and friction as well as enhance other physical characteristics. Determination of the coating levels is vital for optimising the manufacturing process. Benchtop Nuclear Magnetic Resonance (NMR) is a clean, fast and accurate technique for the measurement of finish content and is a viable alternative to traditional wet chemical techniques which are time consuming, use hazardous chemicals and require skilled laboratory personnel. NMR is capable of measuring finish levels below those accurately measurable by solvent extraction.

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