Blast Design

The Two “8 ms Rules” in Blasting

The Two “8 ms Rules” in Blasting: Why They’re Different and What It Means Today At Petr Explosives Group, students in our education classes often ask: “Why do people talk…

The 8 ms Rule: What It Really Means

The 8 ms Rule: What It Really Means – & Why It’s Time to Move Beyond It At Petr Explosives Group, we believe great blasting starts with understanding why we…

Row-to-Row vs. Hole-to-Hole Timing: Most Confused Concept in Blast Design

Row-to-Row vs. Hole-to-Hole Timing: The Most Important (and Most Confused) Concept in Blast Design Timing is one of the most critical factors in surface blasting — and also one of…

Timing in Surface Blasting: Understanding Control, Safety, and Efficiency

Timing in Surface Blasting: Understanding Control, Safety, and Efficiency We discussed with our students what to use for proper timing in our blast designs. We have different practical experiences and…

When Do You Need to Placard Your Truck?

When Do You Need to Placard Your Truck? A Practical Guide for Commercial Blasters Transporting Explosives and Detonators By Petr Explosives Group (PEG) In commercial blasting operations, transporting explosives and…

Why Some Detonators Are HD 1.1 and Others Are HD 1.4

Detonators and Squibs in Mining: Why Some Are HD 1.1 and Others Are HD 1.4 By Petr Explosives Group (PEG) In mining and blasting operations, detonators and squibs are fundamental…