Laboratory testing for dust explosion hazard |
We are a UK based company specialising in laboratory testing of dusts and powders for explosion hazard.
DSEAR (UK) & ATEX (Europe) are applicable for any potentially explosive substance that is found in the workplace. If the explosion hazard of the material is unknown, the classification test provides a simple means of screening to establish whether a dust is explosible or not.
Group A : Combustible dust which ignites and propagates flame. The dust is an explosion hazard and appropriate prevention and protection measures are necessary to meet mandatory safety legislation.
Group B : Non-combustible dust which does not ignite. The dust is not an explosion hazard and no additional precautions are needed.
If the dust is classified as explosible, further laboratory tests are required to provide information on the explosion and ignition characteristics of the material to show compliance with the essential safety requirements of ATEX or DSEAR.
Layer Ignition Temperature
This laboratory test determines the lowest temperature at which a layer of dust of specific thickness (usually 5mm) ignites on a heated surface. By limiting the temperature of any surface inside the company workplace, fires caused by motors and electric light fittings for example can be avoided.
Minimum Ignition Temperature
The minimum ignition temperature is the lowest temperature of a hot surface that will cause a dust cloud to ignite and propagate flame.
Minimum Ignition Energy
The minimum ignition energy is a measure of how sensitive a combustible dust is to electrical or electrostatic ignition. It gives guidance on whether ignition by electrostatic discharge from plant personnel or process conditions is likely to occur in practice.
This laboratory test measures the maximum explosion pressure and rate of pressure rise. These parameters are commonly used to design explosion protection systems – explosion venting, explosion suppression and explosion containment.
Minimum Explosible Concentration
This is the lowest concentration of dust that will support combustion. It may be used as an explosion prevention measure in area where the concentration of the dust can be reliably controlled.
Limiting Oxygen Concentration
LOC is the highest concentration of oxygen that prevents a combustible dust forming an explosive atmosphere. This test is mandatory for any company relying upon inert gas as the basis for explosion safety.
Isothermal Basket tests for self heating
These lab tests are used to determine the self heating characteristics of dusts and powders. Thermal ignition theory can then be applied so that companies can safely transport, store and handle these materials without risk of fire or spontaneous combustion.
Powder Volume Resistivity
Powder volume resistivity is determined by the simultaneously measuring the voltage and current passing through a dust sample of known cross sectional area and depth under laboratory conditions.
The train fire test measures the ability of a combustible dust layer to propagate flame in order that companies can safely transport, store and handle the material.
Summary of tests available in our dust testing labs
Dust explosion testing
Classification screening test for flammability
Explosion Indices test for Kst and Pmax
Minimum Explosible Concentration test for LEL | MEC
Limiting Oxygen Concentration test for LOC
Minimum Ignition Energy test for MIE
5mm Layer Ignition Temperature for LIT
Minimum Ignition Temperature test for MIT
Self heating tests
Isothermal basket test for spontaneous combustion characteristics
UN 4.2 classification test for self heating classification
Other laboratory dust tests
Powder bulk resistivity
Dust explosion testing prices
Discounts are available for testing multiple samples and total order value. Please fill in the dust testing application form for prices.