Becoming a licensed blaster isn’t just about passing a test—it’s about proving you have the knowledge and discipline to work safely with explosives. Whether you’re preparing for your Colorado and Other Blaster License, a state renewal, or a federal/DoD training program, here are the five key things you need to know before exam day:
1. Understand the Regulations Inside & Out
Every state (and federal agency) follows strict rules for explosive storage, handling, and use.
Expect questions on:
•ATF Part 555 requirements (magazines, records, transportation).
•State-specific regulations (e.g., Colorado Rule 7, Missouri statutes).
•Safety distances (K-factors, scaled distance formulas).
Tip: Bring a solid understanding of both state and federal law—memorizing isn’t enough, you must know how to apply the rules in real-world scenarios.
2. Know Your Explosives & Accessories
You’ll be tested on explosive types and properties:
• Dynamite, ANFO, emulsions, water gels – composition, velocity, water resistance.
• Detonators, boosters, and blasting caps – storage and safe handling.
• Basic performance calculations (detonation pressure, energy).
Tip: Examiners want to see that you can choose the right explosive for the right job, not just define it.
3. Be Ready for Math & Calculations
Blasting isn’t guesswork—expect math on your exam. Topics often include:
• Scaled distance formula for safe blasting.
• Burden & spacing in drilling patterns.
• Explosive weight per delay for vibration control.
• Unit conversions (ft → m, lbs → kg).
Tip: Practice sample problems. If you’re rusty in math, spend time reviewing—this is where many candidates lose points.
4. Safety Always Comes First
The exam will test your decision-making in hazardous situations. Know:
• Proper PPE and site safety practices.
• Misfire procedures and reporting.
• Fire, lightning, and transportation precautions.
Tip: Examiners often use “what would you do if…” scenarios—think like a blaster-in-charge, not a helper.
5. Exam & Licensing Logistics
Don’t get caught by surprise:
•Duration: Written tests often run 2–3 hours.
•Format: Multiple choice, calculations, and short answers.
•Passing Score: Usually 70–80%.
•Practical Requirement: Some states require proof of field hours under a licensed blaster.
Tip: Arrive early, bring ID, and double-check what materials (calculator, handbook, PPE) you’re allowed to bring into the exam room.
Final Advice
Treat the blaster exam like the real job: serious, safety-focused, and detail-oriented. Passing isn’t just about a license—it’s about proving you’re ready to take charge of explosive operations.
If you want to go into your exam 100% prepared, consider joining our Practical Explosives Training School (PETS) or our new Video Blaster Training Courses. We’ve designed them to match exactly what regulators expect—and to give you the confidence you need to pass the exam on the first try.
📅 November 20-21, 2025, or February 5-6, 2025, in-person in Golden, Colorado
Anytime: Website-based, online classes: Registration for class online
NEW Services for blasters: SETUP live video-based classes with instructors: contact Dr. Petr to set up a schedule: vp***@*****************up.com / 303-273-0303
