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SGS is a global technical leader in float-sink/washability testing. Our experienced staff are located in major coal producing regions around the world and will give you accurate and impartial results.

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Independent SGS test results are recognized globally and comply with all applicable international standards. Data from your float-sink/washability tests provide you with the information that you need to ensure:

  • Compliance with customer and plant specifications
  • Accurate blending for optimum plant operation
  • Assessment of coal quality and expected recovery rates
  • Characterization of types and amounts of impurities
  • Determination of optimum parameters for plant operations
  • Determination of optimum size range of a specific coal for cleaning

Washability characteristics are determined from float/sink analysis of core samples, as mined samples, or from preparation plant feed samples. During the test, your sample is characterized and quantified as low-density clean coal, high-density reject or intermediate-density middlings.

Our float/sink analysis can be performed on samples ranging in size from bulk washability samples (over 1 ton) to bench-scale size samples. We conduct the tests over a range of densities (from 1.3 specific gravity up to 2.25 specific gravity) and a variety of sizes (from coarse to fine coal).

We also perform froth recovery testing on finer sizes. If your coal contains a high percentage of middlings, we can perform the crushing studies required to determine if you can obtain additional yield by liberating coal from the middlings through crushing.

We offer you a full range industry standard testing services for the coal and coke industry. Our float-sink/washability tests provide you with the information that you need to fully understand the characteristics of your coal, resulting in more growth from your coal operation.

Float-sink and washability testing in the US

SGS Minerals Services in the United States provides float-sink/washability tests at its laboratories in:

  • Beckley, WV
  • Charleston, WV
  • Harrogate, TN
  • Henderson, KY and Pikeville, KY

Our laboratories provide a range of washability services from single gravity quality checks through to full preparation plant performance studies. We efficiently process float-sink work in accordance with ASTM test methods to ensure you get a quick turn-around of your project.

Contact us to find out more.