Stemming plugs do one job: hold stemming material in place so your blast energy goes into the rock, not up the hole. If you're losing energy to blowouts, getting inconsistent fragmentation, or burning through stemming material because it won't stay put — the plug is the fix.
MTI's range of stemming plugs are built for drill and blast operations. Sized from 2 inches (50mm) through to 12 inches (300mm), they fit standard production holes across hard rock mining, quarry, and construction blasting.
How Stemming Plugs Work
A stemming plug sits inside the blast hole at a set depth above the explosive charge. It creates a physical barrier that holds the stemming column (usually drill cuttings or aggregate) in place.
When the charge detonates, the plug limits the blast energy from venting straight up the hole. That means more energy goes into breaking rock, and less gets wasted as noise, dust, and flyrock.
They can also be used to create air decks — a gap between the charge and the stemming that changes how the blast energy distributes through the rock mass. Air decking with a stemming plug can give you a consistent deck length, which you can't guarantee with alternative methods.
