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Foreign matter refers to substances other than the target item that are mixed into raw materials or products and affect product appearance or use. Foreign matter composition analysis is a technique specifically for tiny embedded foreign matter, surface contaminants and precipitates on products. Abnormal substances such as embedded or precipitated particles, migrating small molecules, spots, oils, mists and rubber bloom are qualitatively analysed to find the contamination source or incompatible formulation, making this one of the most commonly used methods for product improvement.
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