"Just burn it" and "just recycle it" both sound simple until you look at what a sanitary napkin is actually made of, and what burning or landfilling it actually produces. We've sat across the table from facilities managers who'd heard both claims from different vendors and had no way to tell which one was true. So here's the detailed version — the one with real numbers in it, not the marketing-brochure version.
What a sanitary napkin actually is
A conventional sanitary napkin is a layered product, not a single material — which is exactly why it's hard to dispose of safely. A typical pad includes a perforated plastic top layer (polypropylene and polyethylene), synthetic fragrance and dye chemicals, a synthetic-fibre or cellulose-pulp transfer layer, a sodium polyacrylate super-absorbent core, a polyurethane hot-melt adhesive, a petrochemical-based polyethylene bottom layer, and a silicone-coated release paper. Put simply: most of a pad, by volume, is plastic and petrochemical material — which is why it takes an estimated 500 to 800 years to degrade in a landfill, and why open burning at low, uncontrolled temperatures releases genuinely harmful smoke.
The scale of the problem
India has an estimated 336 million menstruating women and girls. Of those who use sanitary pads rather than other materials, that works out to roughly 121 million regular pad users — at an average of 8 pads per cycle, that's somewhere around 1 billion pads used every month, or 12 billion a year. Sanitary waste is estimated to make up around 0.65% of India's total solid waste stream by weight — roughly 925 tonnes generated daily. That sounds small as a percentage, but 925 tonnes a day of material that's mostly plastic, handled inconsistently, and often mixed with general waste, is not a small problem in practice.
What official guidance actually says
Menstrual hygiene management (MHM) guidance in India ranks disposal practices on a rough safety spectrum. At the unsafe end: throwing sanitary waste loose into fields or onto rooftops, or wrapping it in paper or plastic and discarding it with general trash. In the middle: burying it to decompose, or burning it in the open in rural and peri-urban areas — both better than the unsafe end, but still uncontrolled. At the safe end: using small-scale incinerators at the community or school level, or managing waste through a proper municipal solid-waste system. The guidance is consistent: incineration, done properly, sits at the safe end of that spectrum — open burning does not.
That "done properly" qualifier matters enormously, and it's the whole reason this article exists. Incineration in general is not automatically safe. Uncontrolled, low-temperature burning of plastic-heavy material produces genuinely toxic emissions. Controlled, high-temperature incineration with air treatment does not. Those are two very different things that both get called "incineration," and the difference between them is the entire point.
The numbers: landfill vs. traditional incineration vs. SMART Kojin
Figures below are from SMART Kojin's own product testing, shown per pad or in parts per million (PPM) as measured, and compared against landfill disposal (no incineration) and generic uncontrolled traditional incineration.
| Pollutant | Landfill | Traditional Incineration | SMART Kojin |
|---|---|---|---|
| CO₂ | 21.4 g/pad | 10–12 g/pad | ≤0.5 g/pad |
| CH₄ (Methane) | 0.009 g/pad (225× CO₂ impact) | 0 g/pad | 0 g/pad |
| CO | N/A | ~2744 PPM | ≤1 PPM |
| SO₂ | N/A | ~332 PPM | ≤1 PPM |
| NOx | N/A | ~65 PPM | ≤1 PPM |
| Dioxins & Furans | Released | Present | Not detected |
The pattern across every pollutant is the same: landfill avoids combustion emissions but generates methane and leaves plastic to persist for centuries; uncontrolled traditional incineration burns the material but without proper temperature or air treatment, producing high levels of carbon monoxide, sulfur dioxide, nitrogen oxides and dioxins; controlled incineration with high operating temperature and air treatment — the approach SMART Kojin is built on — addresses both problems, destroying the material completely while keeping emissions at or near detection limits.
"Incineration" isn't one thing with one safety profile. An open fire and a controlled 800–900°C chamber with treated air both get called incineration — one produces the toxic smoke people fear, the other doesn't produce it at all.
What to actually check before choosing an incinerator
If you're evaluating any sanitary napkin incinerator, not just ours, two things matter more than anything else: the actual operating temperature of the combustion chamber (SMART Kojin runs at 800–900°C, which is what achieves complete rather than partial combustion), and whether exhaust air is genuinely treated before release rather than just vented. Ask for emissions data, not just a temperature spec — a hot chamber with no air treatment can still produce the exact smoke and odor problems people associate with "burning pads."