Combustible Dust Testing

Laboratory testing to quantify dust explosion and reactivity hazards

Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Gas and Vapor

Laboratory testing to quantify explosion hazards for vapor and gas mixtures

Classification of hazardous materials subject to shipping and storage regulations
Testing and consulting on the explosion risks associated with devices and processes which use or produce hydrogen
Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Thermal Stability

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

Adiabatic Calorimetry
Data demonstrate the consequences of process upsets, such as failed equipment or improper procedures, and guide mitigation strategies including Emergency Relief System (ERS) design
Reaction Calorimetry
Data yield heat and gas removal requirements to control the desired process chemistry
Battery Safety

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

Safety Data Sheets

Develop critical safety data for inclusion in SDS documents

Cable Testing
Evaluate electrical cables to demonstrate reliability and identify defects or degradation
Equipment Qualification (EQ)
Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions
Water Hammer
Analysis and testing to identify and prevent unwanted hydraulic pressure transients in process piping
Acoustic Vibration
Identify and eliminate potential sources of unwanted vibration in piping and structural systems
Gas & Air Intrusion
Analysis and testing to identify and prevent intrusion of gas or air in piping systems
ISO/IEC 17025:2017

Fauske & Associates fulfills the requirements of ISO/IEC 17025:2017 in the field of Testing

ISO 9001:2015
Fauske & Associates fulfills the requirements of ISO 9001:2015
Dust Hazards Analysis
Evaluate your process to identify combustible dust hazards and perform dust explosion testing
On-Site Risk Management
On-site safety studies can help identify explosibility and chemical reaction hazards so that appropriate testing, simulations, or calculations are identified to support safe scale up
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 safely handle the effluent discharge from an overpressure event

FATE™ & Facility Modeling

FATE (Facility Flow, Aerosol, Thermal, and Explosion) is a flexible, fast-running code developed and maintained by Fauske and Associates under an ASME NQA-1 compliant QA program.

Mechanical, Piping, and Electrical
Engineering and testing to support safe plant operations and develop solutions to problems in heat transfer, fluid, flow, and electric power systems
Hydrogen Safety
Testing and consulting on the explosion risks associated with devices and processes which use or produce hydrogen
Thermal Hydraulics
Testing and analysis to ensure that critical equipment will operate under adverse environmental conditions
Nuclear Safety
Our Nuclear Services Group is recognized for comprehensive evaluations to help commercial nuclear power plants operate efficiently and stay compliant
Radioactive Waste
Safety analysis to underpin decomissioning process at facilities which have produced or used radioactive nuclear materials
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

Introducing UN Test 0.3 Oxidizing Solids

Posted by Fauske & Associates on 04.17.24

Oxidizing Solids (Combustible Dust Hazard) continued on page 4 Oxidizing substances increase the combustion capabilities of nearby materials, usually by acting as a more reactive oxygen source than the ambient oxygen in the air. The oxidative strength of an oxidizer can vary wildly based on its composition and, especially for solids, factors like particle size and moisture content. As such, classifying oxidizers based on their relative oxidative strength is important for determining the proper safety measures when storing, shipping, and handling oxidizers.

The UN Model Regulations assign Division 5.1 for oxidizing solids, liquids, and gases. Solid oxidizers can be classified using the UN Test 0.3: Gravimetric test for oxidizing solids from the UN Manual of Tests and Criteria. This test compares the oxidative strength of the test material with a standard oxidizer and based on the test results, classifies the test material as an oxidizing substance or not. If the test material meets the criteria for an oxidizing substance, it is then further classified into one of three Packing Groups depending on severity. This article provides an overview of how the test is performed and provides example photos and results.

UN Test 0.3: Gravimetric Test for Oxidizing Solids

0.3 Weigh Scale SetupThe test setup, Figure 1, primarily involves a digital weigh scale connected to a nearby computer, an insulative test plate on the scale, and a wire for igniting the sample. A solid base plate under the scale protects the measurements from vibration. A positioning plate with wide holes is used in conjunction with thin rods projecting up from the base plate to consistently position the test plate on the scale. This positioning plate can also provide further insulation. The setup is protected by a small wind shield to prevent air currents from affecting the data.

To perform the test, the test sample is mixed with cellulose into 30 g aliquots at ratios of 1:1 and 4:1. A cone of aliquot is placed on the scale and ignited. As the aliquot burns, the scale records weight measurements over time. Once the mass loss rate drops below 1 gram/minute, the reaction is considered complete. Five trials are performed for each ratio.

The burning rate during the main combustion period, or BR20-80, is determined by taking 60% of the total cellulose mass in the aliquot and dividing by the time elapsed between 20% total mass loss and 80% total mass loss. The sample’s higher mean BR20-80 between the two tested ratios is used for categorization.

The standard material for the test, calcium peroxide, is tested at ratios of 3:1, 1:1, and 1:2. The standard’s BR20-80s are used in the Division 5.1 and Packing Group classifications, which are outlined in Table 1.

Packing Group Classification

Standard Calcium Peroxide Test 0.3 Example Trial Data and Results

0.3 Test in Progress

The standard reference material described in UN Manual of Tests & Criteria is calcium peroxide. Figure 2 and Figure 3 show example results for one trial. Typically, 5 trials are performed per ratio.

Table 2 lists example results after all trials are complete. Standard deviations greater than 20% warrant error analysis and repeating the test to obtain more consistent results. Similarly, if a linear regression of the data within the t20-80 region yields an R2 value less than 0.90, it is advised that the trial be repeated.

Oxidizing Solid Aliquot Mass Versus Time Displaying Main Combustion Period Length Between 20% Total Mass Loss and 80% Total Mass Loss


Strong oxidizers greatly increase both the risk and the consequences of accidental fires during handling or storage. Understanding the proper shipping, handling, and storage procedures of an oxidizer requires an understanding of its oxidative strength. As such, categorizing oxidizers relative to a standard oxidizer provides crucial insight when assessing hazards in an associated process line. The 0.3 Gravimetric test for oxidizing solids allows for categorization of oxidizers using precise numerical measurements.


  • [1] UN Manual of Tests and Criteria, Seventh Revised Edition (2019)

Topics: Combustible Dust


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