Is Your Facility Ready
for NFPA 660?
NFPA 660 Standard for Combustible Dusts and Particulate Solids is the new unified standard for combustible dust safety, replacing NFPA 652 and several other legacy standards. If your facility handles, processes, or stores combustible powders, NFPA 660 certainly applies to you.
At Stonehouse Process Safety, we specialize in helping manufacturers, processors, and users meet NFPA 660 requirements through:
- Combustible dust testing in our ISO 17025-accredited laboratory
- Dust Hazards Analyses (DHAs) performed by industry-leading experts
- Management Systems development and gap analysis
- Emergency Planning and Response
- Site audits, consulting, and training for full compliance
We work with clients across the United States and internationally to reduce explosion risks, protect personnel, and stay ahead of regulatory requirements
What is NFPA 660?
NFPA 660: Standard for Combustible Dusts was introduced by the National Fire Protection Association to consolidate multiple dust safety standards — including NFPA 652, NFPA 664, NFPA 655, NFPA 654, NFPA 484, and NFPA 61 — into one easy-to-follow framework.
It covers:
- Combustibility classification and powder testing
- Dust Hazards Analysis (DHA)
- Ignition source control
- Explosion protection and mitigation
- Housekeeping
- Operational procedures and management systems
- Employee and contractor training
If you previously followed NFPA 652 or another NFPA dust standard, you’ll need to update your practices to align with NFPA 660.
NFPA 660-Compliant Combustible Dust Testing
The foundation of NFPA 660 compliance is understanding your dust’s fire and explosion properties. We offer fast, accurate, and accredited testing, including:
Combustibility and Explosibility Testing
- Go/No-Go Explosibility and Combustibility Screening (NFPA 652/660)
- 20L Sphere Test for Kst and Pmax
- Ignition Sensitivity Testing
- Minimum Explosible Concentration (MEC)
- Minimum Ignition Energy (MIE)
- Minimum Auto-Ignition Temperature (Cloud) (MAIT)
- Hot Surface Layer Ignition Temperature (LIT)
- Self-Heating Screening and Isothermal testing
- Electrostatic Chargeability, Volume Resistivity, Surface Resistivity, Charge Decay, and discharge testing
Thermal Stability (Self-Heating) Testing
- Differential Scanning Calorimetry (DSC)
- Accelerating Rate Calorimetry (ARC)
- Grewer Oven
- Bulk Powder
- Isothermal Basket
- Aerated Powder
- Air Over Layer
All tests are conducted at our state-of-the-art laboratory, one of the largest and busiest of its kind in North America.
Dust Hazards Analysis (DHA) – A core NFPA 660 Requirement
A Dust Hazards Analysis (DHA) is a mandatory requirement under NFPA 660 for any facility where combustible dusts are present.
Stonehouse provides DHA services that are:
- Comprehensive – we evaluate all relevant processes, equipment, and storage areas
- Actionable – with prioritized, cost-effective recommendations
- Compliant – aligned with the latest NFPA 660 requirements
We also offer DHA updates and revalidations that are required at least every 5 years.
NFPA 660 Compliance Services
Stonehouse Process Safety offers a full range of support to help your facility meet and maintain compliance with NFPA 660:
- Laboratory testing of powders and bulk solids
- Dust Hazards Analysis (DHA)
- On-site audits and consulting
- Training programs for operators, safety teams, and management
- Equipment and process reviews
- Mitigation and engineering control advice
- Management systems development and gap analysis
Whether you’re starting from scratch or revalidating/updating an existing DHA, we can help you build a path to compliance.
Who We Help
We work with a wide range of industries, including:
- Chemical
- Food and beverage
- Pharmaceuticals
- Plastics and rubber
- Wood
- Pulp and paper
- Metal powders and components
Our clients range from multinational corporations to specialty manufacturers, all facing similar challenges in managing dust explosion risks.
Why Choose Stonehouse?
ISO 17025-accredited testing laboratories and a strong team of senior process safety specialists.
- Over 40 years of global process safety experience
- Deep knowledge of NFPA 660 and legacy dust standards
- Practical, engineering-based solutions
- International service with local expertise
Our mission is to provide proactive solutions to identify, assess, and pre-empt hazards – before they become real events.
Let’s Talk About NFPA 660 Compliance
Whether you’re unsure if NFPA 660 applies to your facility or you’re ready to book testing or a DHA, we’re here to help.
Request a Free Consultation
Use the form below or contact us directly to speak with a combustible dust expert.
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