Petr Explosives Blog

The Hidden Punch: It’s Not the Push, It’s the Crack

Same Charge, Different Slope: Why Your Shot Doesn’t Always Work How explosives really trigger avalanches Petr Explosives Group · Practical Explosives Training School · October 2, 2026 Every avalanche blaster…

Same Charge, Different Slope: Why Your Shot Doesn’t Always Work

Where, How High, How Much? A New Calculator for Avalanche Control Blasters Every avalanche blaster knows that the same charge does not do the same job twice. A hand charge…

Secondary Blasting and Boulder Breaking: Selecting the Safest and Most Economical Method

Secondary Blasting and Boulder Breaking: Selecting the Safest and Most Economical Method By Dr.-Ing. Vilem Petr Petr Explosives Group Oversized boulders can interrupt road, railroad, highway, excavation, quarry production, trenching,…

PETS Toolbox Boulder Splitting Capability CalculatorFor Double Base Propellant NxBurst

Development of the PETS Toolbox Boulder Splitting Capability Calculator Lessons Learned from Jackson Hole, Wyoming During the Practical Explosives Training School (PETS) conducted in Jackson Hole, Wyoming, we had the…

Why Do We Care? REGULATORY GUIDANCE & COMPLIANCE Understanding ATF Regulations Through ATF Newsletters

REGULATORY GUIDANCE & COMPLIANCE Understanding ATF Regulations Through ATF Newsletters A Resource for Responsible Blasters By Dr.-Ing. Vilem Petr · Petr Explosives Group & PETS Why Do We Care? The…

Why Do You Care about Stemming Length Calculation

Why Do You Care about Stemming Length Calculation: Good & Bad Practices Petr Explosives Group | Technical Blog Stemming Done Right: A Blaster’s Guide to Better Confinement Proper stemming is…