Magnetic separators They are used in a variety of processing products including powders, granular, and liquid materials. They are provided to capture and retain ferrous metal contaminants. The magnets attract and hold contaminants passing over or near the separator. The captured contaminants accumulate on the separator, and can be cleaned. This ensures product quality, protects consumers, and prevents damage to downstream equipment. The magnetic strength at the surface of the most commonly used NdFeB magnets is 10,000 Gauss.