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Fire assay is an age-old technique that has been used for thousands of years for the determination of precious metals content. It provides unmatched accuracy for the determination of gold in any given sample.
During the last few decades, X-Ray Fluorescence (XRF) systems have become increasingly popular. These systems are very appealing considering their relatively inexpensive price and the fact that they do not require a full laboratory setup. However, even though XRF is a great tool for a quick screening of samples, it is advisable to be cautious when accurate determinations are needed. Many aspects of the sample such as its surface characteristics, light elements, and interferences can jeopardize the accuracy of the results. This is why fire assay is still the industry standard and the approved method for standard institutions such as ASTM or ISO.
At United, we still see many customers who own their own XRF equipment send samples in for fire assay or ICP determinations. It is good practice to verify the XRF findings and also provides peace of mind.
United PMR provides analytical services for the jewelry industry including Fire Assay, ICP, X-ray Fluorescence, MacBeth Color Measuring, Plating Thickness, and Vickers Hardness testing.
For more information, call us at 1-800-999-FINE (3463).