Soil report
Know your clay.
Every Mudkraft piece is made from river clay tested by an independent national laboratory. Here is everything the report found, and what it means for the food you cook.
Tested by
Central Glass & Ceramic Research Institute
March 2026
Ref. CGCRI/KHRJ/2026-03-118
Origin
River bank silt, Ganges tributary, Khurja (Uttar Pradesh)
Depth of extraction
1.8–2.4 metres, below the topsoil horizon
Physical properties
| Colour, wet / fired | Ochre-brown / terracotta |
|---|---|
| Plasticity index | 22.4 · highly plastic |
| Shrinkage, wet to fired | 9.7% |
| Water absorption, fired | 12.8% |
| Firing range | 920–1040 °C |
| Kiln | Wood, 48 h slow cycle |
Chemical properties
| pH | 7.2 · near-neutral |
|---|---|
| Organic content | 1.8% · aged 90 days |
| Iron oxide (Fe₂O₃) | 6.4% |
| Silica (SiO₂) | 58.1% |
| Alumina (Al₂O₃) | 18.3% |
| Lead, cadmium, arsenic | Not detected |
What the numbers mean in your kitchen
Not detected
Lead, cadmium, arsenic
No heavy metals above the lab's detection limits, and no chemical glaze on any piece. Food touches only fired clay.
pH 7.2
Near-neutral clay
The clay itself is close to neutral, so it sits gently with tomato, tamarind and curd.
12.8%
Water absorption
The fired walls stay porous. That is why a matka cools water, and why a new handi is soaked before first use.
48 h
Slow wood firing
Fired at 920–1040 °C over two days, so the pot is strong enough for years of daily cooking.
safe
Heavy metals below detectable limits. No chemical glaze.
The full lab report is available on request.
Orders & enquiries
Find your perfect handcrafted piece.
- Call / WhatsApp
- +91 99906 49990
- sales@mudkraft.com