Stemming Plugs

MITIPLUG

Mechanical plugging device used in underground mining.
· SKU 01-052

MITIPLUG™ is a mechanical plugging device used in underground mining to prevent emulsions and ANFO from slumping or falling out from up holes. The device is made from a semi rigid polymer. The product is resistant to the chemicals in emulsions and ANFO. This plug was recently improved and now features a higher holding capacity, improved downline protection as well as a better seating mechanism for the ANFO hose.

Size · 2 1/2" - 3"
Size guide
Not sure which size? Use the size guide →
Ships same-day from Stanton, KY
Same-day shipping Stocked in Stanton, KY
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MITIPLUG
MITIPLUG
2 1/2" - 3"
Get trade pricing
DROP IT IN. IT HOLDS.
Mechanical UG plug · Chemical-resistant
Why this product

Why MITIPLUG

Blocks emulsions, ANFO

Holds back both emulsion and ANFO in upholes and angled holes.

Why it matters: One plug type handles both explosive products. Simpler inventory, no product-specific plugs.

Chemical-resistant polymer

Made from polymer that won't degrade on contact with explosive chemicals.

Why it matters: Maintains its seal and strength throughout the sleep time. No softening or failure from chemical attack.

High holding capacity

Deep fin design provides exceptional grip force against the hole wall.

Why it matters: Holds heavy explosive columns in steep upholes without slipping.

Improved downline protection

Fin arrangement shields detonating cord and shock tube from damage during loading.

Why it matters: Your initiation system stays intact. No crushed or severed lines at the plug point.

Flexible fin design

Fins flex to accommodate slight variations in hole diameter.

Why it matters: Works in holes that aren't perfectly round. Real-world drill holes, real-world performance.

Enhanced seating mechanism

Tapered entry guides the plug into position and locks it at depth.

Why it matters: Seats cleanly the first time. No re-insertions, no adjustments needed.

Benefits

Built for the bench.

Drop it in. It holds.

Flexible fins fold back going in, snap open at depth. The plug stays where you placed it.

Chemical-resistant polymer

Built for direct contact with emulsions and ANFO. Won't degrade in the loading environment.

Improved downline protection

Updated seating mechanism protects the detonator downline during loading and right up to firing.

Built for every condition

Built for every condition.

Underground upholes

Prevents emulsion or ANFO slumping out of upholes. Hold the collar height where you set it.

Voids and breakthroughs

Bridges voids in the column and seals breakthroughs that would otherwise waste explosive.

Cost-sensitive headings

Cheap insurance against wasted emulsion. Pays for itself in unblown product.

Product details

Specs, storage & more.

Size chart
01-052 2.5" - 3" / 64 - 76mm — 250/box
01-138 3" - 4" / 76 - 89mm — 250/box
Compliance
Non-sparking Yes
Packaging
Pack size 250/box
Two ways: pushed in on the end of the charge hose, or placed with a separate applicator. The flexible fins fold back going in — they catch and hold once seated.
No. The semi-rigid polymer is chemical-resistant to both. That's why it can sit in direct contact with the charge.
Currently 2.5–3" (64–76 mm) and 3–4" (76–102 mm). Pick the one that matches your hole at the collar.
Yes — UV-sensitive polymer. Store in a covered area away from direct sunlight.
Size guide

Step 1 · Measure your hole diameter at the collar
Drag the slider or type a diameter. Between two sizes? Go up.
Recommended
INCHES
4"
5"
6"
7"
8"
9"
10"
11"
12"
13"
ModelNominalMetricRangeQty/BoxSKU
2.5" - 3" 64 - 76Mm 2.0–3.0" 250/box 01-052
3" - 4" 76 - 89Mm 33.5–34.5" 250/box 01-138
Detailed comparison
Side-by-side

Pick the right one.
Every time.

Detailed Comparison

BLASTBAG SOLO self-inflating blast hole plug with dual aerosol cartridgesBLASTBAG™ SOLO BLASTBAG™ EVO - BLASTBAGS™ - MTi USABLASTBAG™ EVO BLASTBAG™ ACE II - BLASTBAGS™ - MTi USABLASTBAG™ ACE II BLASTBAG™ AERO - BLASTBAGS™ - MTi USABLASTBAG™ AERO BLASTBALL™ - Stemming Plugs - MTi USABLASTBALL™ MITIPLUG - Stemming Plugs - MTi USAMITIPLUG ROCKRIVETS - Stemming Plugs - MTi USAROCKRIVETS SLUMPSTOPPA™ - In-Hole Accessories - MTi USASLUMPSTOPPA™
TypeInflatable bagInflatable bagInflatable bagInflatable bagInflatable plugMechanical plugRetention plugRetention device
Inflation / MechanismAerosol, 2-speed actuator (non-flammable, non-toxic)Aerosol, variable pressure sleeveChemical reaction (non-DG, no metal)Compressed air (service air lines)Compressed air via drop line, hermetic bladder + nylon webbingFlexible pilgrim-hat fins (no inflation)Collet-fin friction (rigid or semi-rigid)Polymer bristles + stainless spine (gas-permeable)
Hole Size Range4.5" – 12.25" / 114 – 311 mm4" – 9⅞" / 100 – 250 mm3" – 10⅝" / 76 – 270 mm2.5" – 12.25" / 64 – 311 mm2.5" – 8" / 64 – 203 mm2.5" – 4" / 64 – 102 mm3" – 9" / 76 – 230 mm2.5" – 4.5" / 64 – 115 mm
Surface / UGBothSurfaceBothUG specialist - bothBoth, wet-hole ratedUGBothUG
DG ClassClass 9Class 9Non-DGNon-DGNon-DGNon-DGNon-DGNon-DG
Best For Air DeckingThe most-used aerosol bag worldwide — single-operator, ~30 seconds per holeTwo SKUs cover most hole sizes — simpler stocking, fewer decisionsSites with strict storage rules or metal-detector conveyorsUnderground sites running service air — snap-on couplingWet holes, breakthroughs, cracks/voids — the only wet-hole-rated inflatableUnderground emulsion or ANFO upholes — column retention + air deck in oneRetains the charge column and creates a controlled air deck on trim and pre-split rowsEmulsion uphole loading — holds the column while letting gas through

Swipe to see all columns →

When to pick each
BLASTBAG™ SOLO

Pick BLASTBAG™ SOLO when you're running surface benches and want the most-used aerosol gas bag on the market. Self-contained, single-operator deploy, no extra gear — ~30 seconds per hole. Two-speed actuator lets you inflate slow or fast depending on the situation. Sizes from 4.5" to 12.25" (114 – 311 mm) cover every standard production hole. Class 9 DG — stores and ships under aerosol rules.

BLASTBAG™ EVO

Pick BLASTBAG™ EVO when you want aerosol convenience without the SKU sprawl. Two sizes — Hawk (4" – 6") and Eagle (6" – 9⅞") — cover most surface holes, so you stock less and make one decision on the bench instead of four. Single bladder seals against the hole wall; pressure sleeve controls inflation speed. Class 9 DG.

BLASTBAG™ ACE II

Pick BLASTBAG™ ACE II when storage or transport rules make aerosol products a hassle, or when you're running metal-detector conveyors that throw false trips. Chemical reaction inflation — no aerosol, no metal components, non-DG. Same air-deck performance as SOLO and EVO, just delivered through a controlled chemical reaction instead of pressurized gas. Sizes 3" through 10⅝" (76 – 270 mm).

BLASTBAG™ AERO

Pick BLASTBAG™ AERO when you're underground with service air lines available. Compressed-air operated, dual-bladder construction, snap-on coupling for fast connect/disconnect. Works in any direction — up holes, down holes, even underwater. Sizes 2.5" through 12.25" (64 – 311 mm). Best-seller in underground and the cleanest install when air is already on site. Non-DG.

BLASTBALL™

Pick BLASTBALL™ when the hole is wet or you've got breakthroughs and cracks to seal. The only inflatable in this collection rated for wet-hole deployment — lower it through water on a drop line, then inflate with compressed air. Reinforced rubber bladder with nylon webbing handles -58°F to 185°F (-50°C to 85°C). Sizes 2.5" to 8" (64 – 203 mm). Underground development specialist.

MITIPLUG

Pick MITIPLUG™ when you're loading emulsion or ANFO into underground upholes and need a mechanical plug that creates an air deck AND retains the column. Flexible pilgrim-hat fins fold back on insertion, then lock in place — and the fins let gas through. Revised design includes downline protection. Fits 2.5" to 4" (64 – 102 mm). The most popular plug for underground emulsion upholes.

ROCKRIVETS

Pick ROCKRIVET™ when you need to create a controlled air deck on a trim or pre-split row, or hold the charge column with maximum retention and downline pass-through. Collet-style fins bite the hole wall and don't walk, twist, or shift. Iron ore case study: 38% smaller P80 fragment size with ROCKRIVETS installed. Sizes 3" to 9" (76 – 230 mm), rigid for heavier loads, semi-rigid for tighter holes.

SLUMPSTOPPA™

Pick SLUMPSTOPPA™ when you're loading emulsion in underground upholes and need a gas-permeable retention device to hold the column without compromising the gassing reaction. Polymer bristles with a stainless steel spine hold the column while letting emulsion gas through. Fits 2.5" to 4.5" (64 – 115 mm). The dedicated emulsion-slump solution for underground upholes.

Field reviews

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