Choosing the Right Pottery Clay
Choosing the right pottery clay depends on your experience level, what you want to make (e.g., functional items like mugs/bowls vs. decorative/sculptural pieces), how you'll fire it, your preferred techniques (wheel throwing, hand-building, sculpting), and practical factors like cost and availability
Key Factors to Consider When Choosing Clay
Here are the main things to evaluate:
1. Your Experience Level
- Beginners: Start with forgiving clays that are plastic (easy to shape without cracking), hold form well, and aren't too finicky when wet or drying. Avoid very smooth/fine clays like pure porcelain at first—they're harder to throw and prone to slumping. Good examples of this are NPS Cone 6 White or Primo Pro W2502 Stoneware with Grog
2. Type of Clay Body (the three main categories for kiln-fired pottery)
- Earthenware — Low-fire (usually cone 06–04, ~1000–1100°C). Forgiving, smooth, great color response with glazes, but porous unless sealed. Good for bright colors and decorative work. Often recommended for absolute beginners due to easier handling. Good examples of this are Laguna EM210 Lowfire Clay or Primo Pro R-Terracotta
- Stoneware — Mid- to high-fire (cone 5–10, ~1200–1300°C). Stronger, more durable, often vitreous (non-porous) when fired high enough—better for functional ware like food-safe mugs/bowls. Very popular for beginners/intermediates because it's workable and versatile. Many studios fire to mid-range (cone 6). Good examples of this are Primo Pro W2502 Stoneware with Grog or Laguna White Stoneware Clay.
- Porcelain — Mid- to high-fire (cone 5–10, ~1200–1300°C). Very fine, white/translucent when fired, but least forgiving—less plastic, warps easily, harder for beginners. Save this for later. Good examples of this are Laguna Frost White Midfire Porcelain Clay or Primo Midfire Porcelain Clay
Quick recommendation for most beginners: Go with a mid-fire stoneware (cone 5–6/7). It's forgiving, throws well, and suits functional pieces. If you're doing mostly hand-building or low-fire testing, earthenware is a solid starter.
3. Texture/Grog Content
Smooth (no grog) - Great for detailed work and throwing, but can feel "slippery" or collapse easier. A good example is Laguna White Stoneware Clay.
- Medium/coarse grog — Adds tooth/stability, helps prevent cracking during drying/throwing—excellent for beginners on the wheel or larger pieces. A good example is Primo Pro W2502 Stoneware with Grog
Many starter clays have a bit of grog for better handling.
- High/coarse grog — Not suitable for the wheel but ideal for larger pieces. Adds tooth/stability, helps prevent cracking during drying/throwing. Can be very rough to handle. A good example of this is Primo Pro RTM5015 Sculptural Clay.
4. Firing Temperature (Cone Size)
Match the clay to your kiln/studio's firing range (most NZ community studios fire mid-range cone 6 stoneware or low-fire earthenware). Check with your class or kiln operator first—mismatched cone = failed pots.
5. Colour When Fired
- Red/buff/terracotta (iron-rich) — Warm earthy tones.
- White/off-white — Clean look, shows glaze colours best.
- Speckled/grogged — Adds visual texture.
6. What You Plan to Make & Technique
- Functional/food-safe → Stoneware (mid/high-fire).
- Decorative/sculpture → Earthenware or stoneware.
- Wheel throwing → Smooth or lightly grogged stoneware.
- Hand-building → Any grogged clay helps with slabs/coils.
7. Other Practical Stuff
- Cost — Earthenware often cheaper; porcelain pricier.
Best Starter Options
- Mid-fire stoneware (cone 5–6) — Widely recommended for beginners who want to throw or make usable pots. Smooth or lightly grogged versions are easiest. NPS Cone 6 White Clay or Primo Pro W2502 Stoneware with Grog Clay
- White/off-white stoneware — Clean look, forgiving. Laguna White Stoneware Clay.
- If your class/studio uses low-fire → Earthenware for vibrant glazes. Laguna EM210 Lowfire Clay
Start small, wedge it well, and experiment. Your first choice doesn't have to be perfect—most potters try a few bodies before settling on favourites.