Coal Laboratory Testing

PT. Arbie Scientific was established its coal laboratory in 2006. Although it’s still considered as new, we have a wide range of customers that trust us for its day to day operation. We provide the best and reliable services for coal laboratory testing with a very competitive price.

Quality Control in our laboratory testing is maintained by daily analysis of standard sample, the result of which are presented as range charts for our internal consideration. We also organize and participate in a regular “round robin” proficiency testing program with more than 80 other laboratory. If you want to know or interested to join our round robin testing program, you can click here.

Arbie Scientific coal analysis services include:


Moisture is the water that exists in the coal at the site, time, and under the conditions it is sampled. Our analyst determine the amount of moisture in your samples by measuring the loss in mass between an as-mined sample and a sample that has been heated under controlled conditions.


It is important to measure the sulfur content in coal samples to evaluate the potential sulfur emissions from coal combustion or for contract specifications purposes.

Calorific Value

The calorific value of coal is the heat liberated when the solid fuel undergoes complete combustion in oxygen. In order to obtain accurate results, Arbie Scientific burns your fuel sample in a bomb calorimeter and measures the total heat energy.

Volatile Matter

Volatile matter includes the components of coal, except for water, which are liberated at high temperature in the absence of oxygen. Volatile matter is a key health and safety concern as coals high in volatiles have an increased risk of spontaneous combustion. Arbie Scientific determines the volatile matter in your coal sample by measuring the mass of volatiles before and after weight analysis under controlled conditions.

Fixed Carbon

The fixed carbon content of coals is determined by subtracting the percentages of moistures, volatile matter and ash from the original mass of the coal sample.

Hardgrove Grindability Index

Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will perform in their mills, allowing them to estimate grinding power requirements and throughput capacities. Typical resulting HGI values lie between 30 (increased resistance to pulverization) and 100 (easier to pulverized)

Size Analysis

The behavior of coal particles in crushing and grinding circuits, operations, and solid-liquid separations is strongly dependent on size, a reliable and accurate measurement of particle size and particle size distribution is a vital aspect in coal cleaning.

Crucible Swelling Number

The Free Swelling Index (FSI) is used in this test to measure a coal’s swelling properties when heated under prescribed conditions without physical restrictions. The FSI is obtained by heating prepared samples of coal over a burner and comparing the resultant coke button to a series of standard profiles.