Kiln accessories explained: Kiln plates, supports, separating agents & firing rods
LB BerlinMany people buy a kiln first and only realize after the first few firings that the real difference comes from the accessories. Not because they are "nice to have," but because they determine whether you fire safely, efficiently, and without expensive damage.
If you are looking for the basics on temperatures, bisque/glaze firing, and firing curves: Firing Ceramics: Basics, Temperatures, and Techniques Explained. And if you are just deciding which kiln is right for you: Buying a Kiln: What size, power & technology do you really need?.
Quick Start: The minimum setup for your first safe firing
If you want to start pragmatically, you only need the following to begin:
- Kiln shelves (compatible with your kiln)
- Props / Posts (to create levels)
- Kiln wash for shelves/kiln floor
- A loading plan (spacing, height, airflow)
Important: Never place glazed pieces directly on the kiln floor. Shelves protect the kiln from glaze drips.
Accessories Overview: What everything is for
| Accessory | What you need it for | Typical beginner mistake |
|---|---|---|
| Kiln Shelves | Support the pottery, protect the kiln floor, create levels. | Wrong size / too little clearance from the wall → jams, cracks, splinters. |
| Props / Posts | Stacking stably, creating height, distributing weight. | Too many props / uneven placement → shelf warps or breaks. |
| Kiln Wash | Protective layer: prevents glaze from soaking into shelves and sticking. | Applied too thickly or on both sides → flaking/peeling. |
| Firing Aids (stilts, tripods) | "Lifting" glazed pieces, minimizing contact points. | Wrong placement → marks, wobbling, glaze defects. |
| Heating Elements | Wear part: provides the heat. Must be replaced eventually. | Replacing too late → long firing times, uneven results. |
Kiln Shelves: Material, thickness, shape, and the most common mistakes
Kiln shelves are the "floor" inside your kiln. Cordierite/refractory shelves are very common in the DACH region. Robust, but not indestructible. More important than the brand is: the right dimensions, correct thickness, and proper loading.
Two points that many only learn "the hard way":
- Shelves have temperature limits. If you fire continuously above the maximum temperature, you risk warping and material damage.
- Shelves require even load distribution. Putting items that are too heavy on a thin shelf or point-loading them leads to cracks/warped levels.
A specific, frequently mentioned point: shelves should not be supported "randomly." Manuals often recommend stacking shelves cleanly and stably on props. Not with too many contact points.
Props & Setups: Stacking stably without stressing your shelves
Props (posts) are not just "accessories," but your shelving system. Good setups save energy because you utilize the kiln better, and they reduce the risk of wobbling and shelf breakage.
A common professional approach: standardized heights. If you build up a set of props in typical heights, you can quickly create levels without improvising every time.
Why cordierite is often mentioned: dimensionally stable, heat-resistant, reliable, and suitable for many standard firings up to high temperatures.
Kiln Wash: How to protect your shelves and kiln floor
Kiln wash is a protective layer that prevents glaze drips from soaking into porous shelves or sticking to them. This allows you to lift off glaze residue later rather than "sacrificing" the shelf.
The function is often described very similarly: glaze should not penetrate/stick, but rather be removable along with the layer. See, for example, Töpferbedarf Brock: Kiln Wash.
Depending on the product/manufacturer, there are specific mixing and application instructions (e.g., "apply thinly").
Firing Aids: Stilts, tripods, etc. (when to use, when it's risky)
Firing aids are tools to "decouple" glazed pieces. For example, with highly fluid glazes or special shapes. The trade-off: you reduce the contact area, but risk marks or instability if you set them up incorrectly.
A good, non-obvious tip: use test pieces. When testing new glazes, test the combination of glaze + firing aid in the same firing. This saves you from nasty surprises (e.g., the glaze running more than expected).
Heating Elements: Understanding wear & how to replace them
Heating elements are wear parts. Eventually, they become weaker. Not always "all at once," but gradually: firing times become longer, temperature peaks become harder to reach, and in the worst case, the heat in the kiln becomes more uneven.
If you have already ordered heating elements, that is a good sign: these are exactly the accessories that real kiln owners need regularly. In a buying guide (and product advice), it is worth stating clearly: A kiln is a system; maintenance is part of it.
For brand/model-specific details (e.g., Kittec), you can link internally: Guide: Kittec Kilns.
Maintenance & Safety: Dust, cleaning, storage
A topic many underestimate: Dust. Old kiln/refractory dust and ceramic dust should not be stirred up. In practice, the advice often heard is: clean with a damp cloth, ventilate well, and use a mask/respirator when working with dust.
For "shelf maintenance" and dust, it is frequently recommended to clean carefully and wear protection (masks/respirator) rather than stirring up dust.
Checklist: Before buying & before firing
- Does the shelf size fit? (Diameter/internal dimensions, plan for clearance from the wall)
- Do you have enough prop heights? (Standard heights instead of improvisation)
- Is kiln wash available? (Protect shelves/kiln floor. Apply thinly, let dry)
- Loading plan? (not too dense, allow airflow, nothing with glaze directly on the kiln floor)
- Maintenance plan? (Heating elements are wear parts)
-
Dust handling? (clean damp, wear protection, ventilate well)
FAQ
Do I have to apply kiln wash to both sides of the kiln shelf?
In practice, usually only the "top" side is treated. This reduces flaking and prevents flakes from falling onto glazes below. (This topic is very commonly described this way in community discussions.)
How much space does a kiln shelf need from the kiln wall?
Plan for some air on the sides so that the shelf and kiln can move minimally when hot without jamming. Many experienced users deliberately measure "with a reserve."
Why does my firing become uneven even though the temperature is correct?
Common reasons include packing too densely, uneven weight distribution, insufficient airflow, or a kiln taking longer because heating elements are wearing out.
