Flammability and explosiveness tests of suspended powders/dusts

Flammability and explosiveness testing of suspended powders and dusts are essential safety tests for assessing industrial risks associated with the handling, storage, and transport of finely divided solids. Many powders of food, plant, chemical, or polymer origin exhibit a high explosive potential when suspended in air, particularly in the presence of an ignition source.

These tests make it possible to characterize the behavior of combustible dusts (sugars, starches, flours, vegetable powders, dry extracts, additives, polymer powders, etc.) under controlled conditions, in order to prevent industrial accidents, silo explosions, fires or installation failures.

They are fully part of an approach to managing ATEX risks , regulatory compliance and the safety of people, equipment and industrial sites.

Principle of flammability and explosiveness testing

The tests are carried out in a standardized closed chamber , specially designed to simulate the conditions of a suspended dust explosion. The powder being tested is dispersed homogeneously in the air, then subjected to a controlled energy source.

Depending on the protocols implemented, several critical parameters can be measured:

• minimum ignition energy (MIE)
• the minimum ignition temperature
• the maximum pressure developed during the explosion (Pmax)
• the maximum rate of pressure rise (dP/dt)
• the explosiveness index (Kst)
• the flame propagation behavior

This data makes it possible to classify dust according to its hazard level , to identify critical ignition conditions and to adapt prevention and protection measures.

Measured parameters and interpretation of results

The results obtained during the tests provide an objective basis for the analysis of industrial risks:

• Minimum ignition energy (MIE) : indicates the sensitivity of the dust to a source of spark or electrostatic discharge.
• Maximum pressure (Pmax) : reflects the potential violence of the explosion.
• Kst index : allows dust to be classified (St0 to St3) according to its explosive power.
• Flame propagation speed : useful for assessing the spread of an accidental event in a facility.

These parameters are essential for defining equipment design requirements, protective devices (vents, inerting, explosion suppression) and operational procedures.

Matrices involved

Flammability and explosivity tests are suitable for a wide variety of industrial powders, including:

• sugars, starches, flours, cereals, food powders
• functional ingredients and additives
• dried plant extracts and plant powders
• powders for animal nutrition
• cosmetic powders and formulated ingredients
• polymer powders, fillers and powdered materials
• dust from grinding, drying or mixing processes

Each matrix can exhibit specific behavior, strongly influenced by particle size, humidity, chemical composition, and suspension conditions.

Application sectors

These trials are relevant to many industrial sectors:

• agri-food industry
• animal nutrition
• nutraceutical
• cosmetic
• plants and natural ingredients
• packaging
• materials and polymers
• design offices and process engineering

They are particularly recommended during the development of new products, the modification of a process, the safety audit of a site or in the context of an ATEX regulatory analysis.

Regulatory issues and industrial safety

Dust explosivity tests help to meet regulatory requirements for the safety of industrial facilities, particularly within the framework of ATEX directives and occupational risk prevention measures.

They allow manufacturers to:

• Identify the dangers associated with combustible dust
• adapt the equipment and processes
• reduce the risk of serious accidents
• documenting security and insurance files
• securing operators and infrastructure

YesWeLab Expertise

YesWeLab relies on a rigorously selected network of partner laboratories equipped with the specialized equipment necessary to perform flammability and explosivity tests. The majority of these laboratories are certified and/or accredited according to recognized standards (ISO 17025, COFRAC).

Each request is analyzed by our scientific team in order to direct your samples to the most suitable laboratory, taking into account the nature of the powders, the volumes available, the objectives of the study and the regulatory constraints.

Thanks to our digital platform, you benefit from centralized management of your trials , simplified sample tracking and rapid access to analytical results.

For any technical questions, specific needs or quote requests regarding powder flammability and explosivity testing, contact the YesWeLab team now.

• Powder particle size analysis
• Analysis of powder cohesion
• DSC/ATG thermal analysis
• FTIR/Raman identification of powders