Hazards Analysis, Code Compliance & Procedure Development

Services to identify process safety hazards and facilitate compliance with established standards and codes.

Combustible Dust Testing

Laboratory testing to quantify dust explosion and reactivity hazards

Flammable Gas & Vapor Testing

Laboratory testing to quantify explosion hazards for vapor and gas mixtures

Chemical Reactivity Testing

Laboratory testing to quantify reactive chemical hazards, including the possibility of material incompatibility, instability, and runaway chemical reactions

ISO Accreditation and Scope
Fauske & Associates fulfills the requirements of ISO/IEC 17025:2017 in the field of Testing
DIERS Methodology

Design emergency pressure relief systems to mitigate the consequences of unwanted chemical reactivity and account for two-phase flow using the right tools and methods

Deflagrations (Dust/Vapor/Gas)

Properly size pressure relief vents to protect your processes from dust, vapor, and gas explosions

Effluent Handling

Pressure relief sizing is just the first step and it is critical to safety handle the effluent discharge from an overpressure event

Thermal Stability

Safe storage or processing requires an understanding of the possible hazards associated with sensitivity to variations in temperature


Classification of hazardous materials subject to shipping and storage regulations

Safety Data Sheets

Develop critical safety data for inclusion in SDS documents


Model transport of airborne virus aerosols to guide safe operations and ventilation upgrades


Model transport of contamination for source term and leak path factor analysis

Fire Analysis

Model transport of heat and smoke for fire analysis

Flammable or Toxic Gas

transport of flammable or toxic gas during a process upset

OSS consulting, adiabatic & reaction calorimetry and consulting

Onsite safety studies can help identify explosibility and chemical reaction hazards so that appropriate testing, simulations, or calculations are identified to support safe scale up

Mechanical, Piping, and Electrical

Engineering and testing to support safe plant operations and develop solutions to problems in heat transfer, fluid flow, electric power systems

Battery Safety

Testing to support safe design of batteries and electrical power backup facilities particularly to satisfy UL9540a ed.4

Hydrogen Safety

Testing and consulting on the explosion risks associated with devices and processes which use or produce hydrogen

Spent Fuel

Safety analysis for packaging, transport, and storage of spent nuclear fuel

Decommissioning, Decontamination and Remediation (DD&R)

Safety analysis to underpin decommissioning process at facilities which have produced or used radioactive nuclear materials

Laboratory Testing & Software Capabilities

Bespoke testing and modeling services to validate analysis of DD&R processes

Nuclear Overview

Our Nuclear Services Group is recognized for comprehensive evaluations to help commercial nuclear power plants operate efficiently and stay compliant.

Severe Accident Analysis and Risk Assessment

Expert analysis of possible risk and consequences from nuclear plant accidents

Thermal Hydraulics

Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions

Environmental Qualification (EQ) and Equipment Survivability (ES)

Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions

Laboratory Testing & Software Capabilities

Testing and modeling services to support resolution of emergent safety issues at a power plant

Adiabatic Safety Calorimeters (ARSST and VSP2)

Low thermal inertial adiabatic calorimeters specially designed to provide directly scalable data that are critical to safe process design

Other Lab Equipment and Parts for the DSC/ARC/ARSST/VSP2 Calorimeters

Products and equipment for the process safety or process development laboratory


Software for emergency relief system design to ensure safe processing of reactive chemicals, including consideration of two-phase flow and runaway chemical reactions


Facility modeling software mechanistically tracks transport of heat, gasses, vapors, and aerosols for safety analysis of multi-room facilities


Our highly experienced team keeps you up-to-date on the latest process safety developments.

Process Safety Newsletter

Stay informed with our quarterly Process Safety Newsletters sharing topical articles and practical advice.


With over 40 years of industry expertise, we have a wealth of process safety knowledge to share.

Recent Posts

Combustible Dust, Flammable Dust, Explosive Dust: A Fire Hazard?

Posted by The Fauske Team on 07.03.13

When thinking about dust hazards within your facility, the first thought is typically: “Is my dust an explosible hazard?” Even though that is a great question to investigate, another question to ask should be: “Is my dust a fire hazard?” Depending on the answer to this question, your dust may fall into the flammable solids category for identification.

According to BusinessDictionary.com, a flammable solid is "any solid, other than an explosive or blasting agent, that can catch fire in the following ways:

  1. through friction

  2. via absorption of moisture

  3. a spontaneous chemical change

  4. through heat retained from a manufacturing or other process, or

  5. that which can be ignited easily and, when ignited, burns so vigorously or persistently as to create a serious fire hazard.” 

Further, HAZMAT (Hazardous Materials) Class 4 Flammable Solids describes flammable solids as “any materials in the solid phase of matter that can readily undergo combustion in the presence of source of an ignition under standard circumstances, i.e. without:

  1. Artificially changing variables such as pressure or density; or

  2. Adding accelerants”

So, what is a solid exactly? While we might think of wood as a solid, for example, so are its many constituent fibers.  Medications are a solid as are the particles making up each pill.  Powder based makeup is made up of many particles before it is packaged.  Before you eat your morning cereal, your “crunchios” were once solid dusts capable of combustion. Other industries with flammable dust solids: plastics/polymers, manufacturing, agriculture and petrochemical.

Download Case Study on A Risk Based Approach for Combustible Dust Hazard  Mitigation

combustible dust,flammable solid

The Class 4 Division 4.1 – Flammable Solids Test is often referred to as the “UN 4.1 - Burn Rate Test”.  This test was designed to distinguish between materials that will barely ignite when an ignition source is present and those that will burn very rapidly.  This information is important when characterizing your material. 

The video attached is an example of a Class 4 Division 4.1: Flammable Solid – Packing Group II.  This means that the flame has traveled the entire length of the powder train in less than 45 seconds and has passed the wet zone.  The test is also used by OSHA and the EPA [as described in Method 1030] to establish the combustibility/ignitability of a material for regulatory purposes dealing with employee safety and waste disposal safety.

The test method is fairly straightforward and provides semi-quantitative data (burning rate and burning time) that can be used to qualify a material’s hazard class. This test is used by the US Department of Transport [DOT] for rules governing ground transportation of hazardous chemicals; but it is also used in the Dangerous Goods Regulations [DGR] established by the International Air Transport Association [IATA] and in the International Maritime Dangerous Goods Code [IMDG Code] establish by the International Maritime Organization [IMO] for safe air and sea transport, respectively.

For more information on this subject, the Burn Rate Test, a simple Go/No-Go test (simple screening test to see if you need more) and combustible dust, please visit www.fauske.com  

FAI's 3 Step Approach to DHA


Topics: Combustible Dust, explosive dust, flammable dust, fire hazard, dust hazard, flammable solid, explosive solid, combustible solid, UN 4.1, burn rate test


Is My Dust Combustible?

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