Factory products may have abnormal defects or surface contamination such as black spots, oily substances, powdery substances, oil stains, etc. Many foreign objects have destructive effects on product quality and even threaten the personal safety of production personnel and consumers. Therefore, it is of great significance to analyze the foreign matter components as soon as possible, identify the source or link of pollution, eliminate hidden dangers, and improve the formula system in order to enhance product quality.

Embedded foreign objects or abnormal spots, surface pollutants, precipitates, oily substances, foggy substances, rubber spray, yellowing and black spots of industrial products, impurities and by-products of chemical products in electronic products

CNAS、CMA

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test project	Testing standards and methods	Sample Requirements
Foreign object analysis test	Adopting internal standards