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Combustible Dust Training Institute

Combustible Dust Training Institute — Skills Development

Understanding Hybrid Mixtures and How They Change Your Dust Explosion Testing Parameters

A focused, expert-led course on how the presence of flammable gases or vapors in combination with combustible dust changes Kst, Pmax, MEC, MIE, and MIT — and what that means for your testing strategy, hazard assessment, and protection system design.

Led by Chris Cloney, PhD., PEng.
~40 Minutes of Training
6 Lessons + Assessment
Certificate of Completion Included
3 months access • Instant start
Save 40% — Limited Time
$299 $499
You save $200 USD
  • ✓ 6 Expert-Led Video Lessons
  • ✓ Hybrid Mixture Fundamentals
  • ✓ Impact on Kst, Pmax, MEC, MIE & MIT
  • ✓ Final Assessment Quiz
  • ✓ Certificate of Completion
  • ✓ 3 Months Course Access

Secure checkout • Instant access

Questions? support@dustsafetyscience.com

35+Years of
Industry Experience
6Structured
Lessons
40 minFocused
Training
100%Online &
Self-Paced

The Risk Is Real

Are Your Dust Explosion Parameters Still Valid When Flammable Gases Are Present?

Standard combustible dust testing assumes a pure dust-air mixture. But in many real-world industrial processes, combustible dust coexists with flammable gases or vapors — creating hybrid mixtures that behave very differently from either component alone. Hybrid mixtures can dramatically increase explosion severity, reduce ignition thresholds, and invalidate the testing parameters you are relying on for your hazard assessment and protection system design. If your facility handles both combustible dust and flammable gases or vapors, your standard dust test results may be significantly underestimating your actual risk.

This course gives you a clear, practical understanding of how hybrid mixtures affect each key explosion testing parameter — so you can determine when standard testing is sufficient and when hybrid mixture testing is required.

What You Will Gain

Specialized Knowledge You Can Apply Immediately

01
Identify How Hybrid Mixtures Form

Recognize the five common industrial causes of hybrid mixtures — from direct solvent mixing and powder charging into vessels with flammable headspace gases, to upset conditions in dryers, smoldering silos, and leaking conveying systems.

02
Quantify the Impact on Explosion Severity

Understand how even small amounts of flammable gas can dramatically increase Kst and Pmax, and why explosions can occur when dust is below MEC and gas is below LFL simultaneously.

03
Assess Changes to MEC, MIE, and MIT

Learn how hybrid conditions lower the minimum explosible concentration, reduce minimum ignition energy, and decrease minimum ignition temperature — and how to account for these shifts in your DHA and ignition control programs.

04
Apply Combined Flammability Limit Concepts

Work through combined lower flammability limit calculations for real dust-gas pairs including starch/methane, magnesium stearate/ethanol, and oil cake/hexane, and understand the testing challenges that come with hybrid mixture characterization.

Course Curriculum

Inside the Training Program

Six focused lessons cover hybrid mixture fundamentals, the impact on each key testing parameter, and practical guidance on testing strategy and protection system implications.

L1
Example Causes of Hybrid Mixtures
The five industrial scenarios that create hybrid mixtures: direct solvent mixing, powder charging into flammable headspace, dryer upsets, smoldering silo off-gassing, and leaking conveying or inerting systems.
L2
Impact on Explosion Severity Parameters
How flammable gas concentration shifts Kst and Pmax, why explosions can occur below both MEC and LFL simultaneously, and why hybrid testing requires significantly more data points than dust-only testing.
L3
Impact on Minimum Explosible Concentration
How even small amounts of gas can lower the MEC of a dust, with data from activated carbon/hydrogen hybrid mixtures and the non-linear mixing behavior seen in some dust-gas combinations.
L4
Combined Lower Flammability Limits
Combined LFL calculations for real dust-gas pairs including starch/methane, magnesium stearate/ethanol, and oil cake/hexane, and how the number of required tests increases from 4–5 to dozens per material.
L5
Impact on MIT & MIE
How hybrid mixtures reduce minimum ignition temperature and minimum ignition energy, illustrated with lactose/solvent data showing MIE dropping from 30–100 mJ to 10–30 mJ and MIT decreasing by up to 70°C.
L6
Course Summary & Testing Challenges
Summary of increased severity, decreased flammability limits, and reduced ignition thresholds, plus the key DHA questions to ask when hybrid mixtures may be present at your facility.
🏆
Certificate of Completion
Complete all lessons and pass the final assessment to earn your certificate of completion, awarded through the Dust Safety Academy platform.

Meet Your Instructor

Learn From Industry-Leading Experts

Chris Cloney

Lead Instructor

Chris Cloney, PhD., PEng.
Managing Director, Dust Safety Science • Co-Founder, CDTI

Chris Cloney has an undergraduate degree in mechanical engineering and a PhD in chemical engineering studying the physics and chemistry of dust explosions, including hybrid mixture behavior. Over the past decade he has worked with hundreds of companies and safety professionals around the world, sharing dust safety lessons through podcasts, webinars, and in-person training programs. He is the founder of Dust Safety Science and co-founder of the Combustible Dust Training Institute.

Michelle Murphy

Co-Instructor

Michelle Murphy, M.S., CCPSC
President, Mica LLC • Co-Founder, CDTI

Michelle Murphy is a seasoned chemical engineer and process safety expert with over 25 years of consulting experience. She founded Mica, LLC to help manufacturing facilities identify and manage combustible dust and reactive chemical hazards. Her expertise spans dust hazard analysis, combustible dust testing, process safety program development, and emergency relief system design across food, agriculture, chemicals, metals, and pharmaceuticals.

Why CDTI

World-Class Training Built on 35+ Years of Real-World Expertise

Expert-Led Training

Our instructors have over 35 years of experience in industrial safety, consulting for leading safety organizations and contributing directly to NFPA and OSHA standards development.

Practical and Actionable

Our training goes beyond theory to deliver practical solutions you can implement immediately. Learn to identify hazards and protect your facility with real-world strategies that work.

Trusted by Industry Leaders

CDTI training has been trusted by companies in manufacturing, grain, chemical, and energy sectors to reduce risk and ensure compliance. Join the ranks of professionals protecting their teams.

Evidence-Based Curriculum

Every lesson is rooted in peer-reviewed research, global incident data, and 35+ years of combined real-world expertise — not outdated textbooks or generic safety content.

3 Months Access

Enroll once and get 3 months of access to all course materials. Return to review lessons, reference calculations, and stay current with evolving safety standards at your own pace.

Who This Course Is For

Built for Technical Professionals Working With Complex Hazard Profiles

Process Safety EngineersDHA ConsultantsEHS ManagersDust Testing SpecialistsExplosion Protection EngineersChemical EngineersRisk EngineersResearch & Development Professionals

Enroll Today

Everything Included in the Course

Save 40% — Limited Time Offer

$499.00 USD

$299

You save $200 — Enroll before this offer expires

  • ✓ 6 Expert-Led Video Lessons
  • ✓ Hybrid Mixture Fundamentals
  • ✓ Impact on Kst, Pmax, MEC, MIE & MIT
  • ✓ Protection System Implications
  • ✓ Final Assessment Quiz
  • ✓ Certificate of Completion
  • ✓ 3 Months Full Course Access

Trusted by safety professionals in chemical, pharmaceutical, food, and energy sectors worldwide.

Hybrid Mixtures Course — $299