What “Class 6.2” actually means for your dental practice

If you run a dental practice, you generate Class 6.2 waste whether or not anyone has ever said those words to you. Class 6.2 is the dangerous-goods division for infectious substances under the federal Transportation of Dangerous Goods (TDG) regulation, and it is the quiet regulatory backbone under your sharps containers, your extracted-tooth waste, and your blood-contaminated gauze.

Category A vs Category B

The first thing worth understanding is that Class 6.2 splits into two categories, and the distinction matters enormously for what you pay and how the material is handled. Category A is material capable of causing permanent disability or life-threatening disease in otherwise healthy people — think cultured pathogens and certain laboratory specimens. Almost nothing a general dental practice produces is Category A.

Category B is everything else with an infectious character: your sharps, your blood-soaked consumables, your pathological waste. Category B infectious substances are assigned to UN3291, and that UN number is what drives the packaging standard you see referenced on the side of a compliant sharps container.

What UN3291 packaging actually requires

UN3291 is not a brand or a product line — it is a performance standard. A compliant package is a triple system: a leak-proof primary receptacle, a leak-proof secondary container, and a rigid outer packaging strong enough to pass drop and puncture testing. The yellow sharps container that meets this standard has been tested to survive the realistic abuses of transport, not just to look the part.

This is also why “just double-bagging it” is never compliant. The standard is about tested performance under transport stress, and an untested bag has no standing under TDG no matter how many you use.

Where clinics most often go wrong

• Overfilling. A sharps container has a fill line for a reason. Past it, the closure can fail the very performance test the container was certified against.
• Mixing streams. Dropping non-infectious chemical waste into a biomedical container doesn't make it disappear — it can re-classify the whole container and complicate the manifest.
• Storage drift. Accumulating filled containers past your storage limit between pickups is a compliance exposure even when every container is individually correct.

The generator's actual obligation

Here is the part that reassures most office managers: as a generator, you are not expected to be a TDG carrier. Your obligation is to segregate correctly, use compliant packaging, and hand the material to a certified carrier under a manifest. The transport classification, the documentation, and the chain of custody are the carrier's job — ours.

What you keep is the paperwork: a manifest copy at pickup and a disposal certificate once the material reaches a licensed facility. Those two documents are what an auditor or insurer will ask for, and they are the entire reason the classification exists in the first place.

None of this is complicated once it's named. The framework is just doing quietly, in the background, exactly what you'd want it to do: making sure the most sensitive waste your practice produces moves under a tested, documented, accountable system from your operatory to its final disposal.