Layer Ignition Temperature (LIT) Testing

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Our UK laboratory generates flammable & explosive test data for your combustible dust and powders. Th layer ignition temperature test determines the lowest temperature at which a heated surface will ignite combustible dusts or powders when settled as a dust layer.


The Sigma-HSE Advantage

Sigma-HSE is your single solution provider for a full range of combustible dust testing & explosion analysis testing. Our dedicated team of experts are committed to helping you ensure that your dusts and/or powders will not generate a combustible dust explosion. We will aid you in understanding your material characteristics so you can maintain workplace safety and comply with the regulators.

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Frequently asked questions

What are your Standards & Schedule of Accreditation

BS EN ISO IEC 80079-20-2 to the standards before BS EN 50281-2-1 / ASTM E1491

What is the Layer Ignition Temperature (LIT) test?

The Layer Ignition Temperature (LIT) test is conducted to determine the lowest temperature at which a hot surface will ignite combustible dust or powders when settled as a dust layer.

How does the Layer Ignition Temperature (LIT) test work?

Your test sample is placed onto an isothermally heated hotplate and formed into a 5 mm layer. Once an ignition temperature is observed, the hotplate temperature is reduced and retested. This is then repeated with fresh combustible dust until the lowest ignition temperature of dust layers are established.

What does Layer Ignition Temperature (LIT) data do?

The layer ignition temperature test is one of the three core tests for accessing a material’s ignition sensitivity when exposed to hot surfaces. The hot surface ignition temperature of dust layers are generally used when the avoidance of ignition sources’ is the ‘basis of safety’ for an operation.

This dust layer test data is required for defining the maximum operating temperature for electrical and non-electrical equipment used in areas where test materials are present, or dust accumulation may occur.

What is the benefit of the Layer Ignition Temperature (LIT) test?

The avoidance of sources of ignition as the ‘basis of safety’, is often used for processes such as powder handling systems; charging, storage vessels, from sacks, IBCs or FIBCs, pneumatic conveying, milling and tabletting operations.

Many materials that can create explosive atmospheres are found to be insensitive to ignition and therefore, it is easy, practical and cost-effective to ensure that an ignition source capable of initiating a dust explosion is not present.

How to get your materials tested

Receive quick and accurate testing data in just a few simple steps

Contact us

Get in touch with one of our experts so we can learn more about your specific process, unit operations and combustible dust testing requirements. We'll then generate and send you a customised quote.

Prepare & ship

Prepare your material samples and ship them to one of our globally accredited laboratories (UK or India).

Analysis & Reports

Once we've received your samples, we'll begin testing and analysing. We'll then create and send you an actionable in-depth report detailing the potentially hazardous properties of your materials.

Post-project support

If you need support after receiving your report, our after-project support team will be on hand to assist you with any questions you may have.

Discover our range of combustible dust testing solutions

We undertake the following combustible dust and powder tests to simulate full scale process, and process upset conditions. ​

Test your explosive dust and powders for their minimum ignition energy

Whether your process uses grain dust, coal dust or metal dust, getting your hazardous materials tested is an important step to prevent a combustible dust explosion, flash fire or other process-related hazards. Get in touch to learn more about how we can assist you in keeping your process plant and unit operations safe from combustible dust and powder explosions.
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