Sandustry: How to Move and Store Lava With the Cinder Process

Lava in Sandustry breaks the rules that make the rest of your factory tidy. It will not ride a belt, it cannot be pumped through pipes, and the second you dig into a pool it pours out and burns whatever sits below. The fix is to stop treating lava as a liquid and start moving it as a solid.

Quick answer: Freeze a lava pool into Scoria with snow or the Cryoblaster, smash the Scoria with any tool or weapon to drop Cinder, carry the Cinder on belts, launchers, grabbers or drones, then hit it with the Flamethrower at the destination to turn it back into lava.

The Cinder loop: the only reliable way to move lava

Raw lava has a density of 75 and is flagged as non-launchable, so no transport building will accept it. Every working method runs lava through a solid intermediate called Cinder. Once you understand the loop, it becomes repeatable and safe.

Dump snow or ice onto the lava pool. The Cryoblaster does this cleanly, and you can keep piling snow onto flowing or dripping lava until it stops moving. The lava cools and hardens into Scoria.

Destroy the Scoria. Any weapon, rocket, shovel or mining tool works. When it breaks apart it drops as Cinder, a solid powder.

Collect and move the Cinder. It behaves like any other solid, so conveyor belts, launchers, the vacuum, the grabber and drones all handle it. A grabber or vacuum makes quick work of gathering it after the Scoria shatters.

Re-melt the Cinder where you need heat. Drop it into a chamber and apply the Flamethrower’s direct flame. Only a hot enough source like the Flamethrower converts Cinder back into lava. Passive heat, thermal buffers and pyro dispensers will not do it.

How you know it worked: the first stage is done when you see the named solid Scoria, not just a darker crust on the lava edge. Cinder that arrives but stays powdery means the heat source is not hot enough. Lava that forms and then leaks means the destination chamber is not sealed.

Where to find lava and how to open a pool safely

Lava sits deep underground in the Lava Cave, showing up as bright orange pools once you dig past the ice layers. You will find it under ice, behind shatter stone and in open chambers, with larger deposits generally sitting deeper. Map generation varies, so exact sizes differ between worlds.

to Move Lava in Sandustry - step 1 — Lava pools sit deep in the caves, often below ice and behind stone.

The moment you glimpse the glow, stop and plan before you break the wall. Lava spreads instantly and will flood belts or water systems that sit downhill. Keep a Cryoblaster and a supply of snow ready so you can freeze any spill the second it starts running.

The lava freezes into Scoria — Approach a pool with cold ammo ready so you can freeze any spill immediately.

Lava is also handy while exploring. It melts thick ice and can open routes through frozen sections that would otherwise block your path.

How to store lava

Because lava depletes as heat systems draw on it, storage is really about keeping a Cinder stockpile and converting it on demand. Build containment early rather than improvising when a pool is already spilling.

Put a filter on top of the chamber so stray sand and residue cannot fall in.
Leave extra height and add launchers or belts so you can pull material back out cleanly.
Seal every side. A single missing pixel lets lava drip into places you do not want it.
Keep a visible pile of Cinder on hand, since heat systems slowly burn through lava and need topping up.

A single shared chamber that holds Cinder and melts it as needed carries most players for a long time. If your factory grows large, you can later split pure lava tanks and pure Cinder tanks, but that separation is optional.

Tip: There is no vanilla endless lava building. Any true infinite source you have heard about comes from mods, so plan around a consumable supply.

What lava is used for

Lava supplies heat and burning power, and every system that pulls that heat gradually consumes it. The main jobs break down like this.

Use	How it works
Auto-burning	Rising lava flames ignite residue, slag, seeds and flowers as they pass overhead. Lava can also be trapped inside a Filter to ignite pixels that cross it.
Thermal buffers	Buffers charge from the Flamethrower or by consuming adjacent lava or snow. A buffer sitting in lava consumes it, while one above a pool heats from the rising flames.
Steam	Water or snow landing on lava evaporates instantly into Steam. The amount of lava does not drop from this reaction.
Smelting	Copper and later materials smelt on a thermal buffer or near lava that is kept hot, so many players build a small lava chamber under the smelter line.
Exploration	Melts thick ice, opens frozen paths, and supplies constant low-level heat for anything that must stay warm.

Two details matter when you build around these. Wide, shallow pools give better flame coverage than deep, narrow ones, so surface area beats depth for heating. And Steam has no direction of its own, so guide it into tanks or condensers with walls and filters before it rises off and rains back down somewhere random.

A semi-automated Cinder-to-lava setup

You do not need a perfect closed loop to make lava useful. A dependable working build feeds Cinder in, converts it on demand, and lets the flames handle the burning.

Bring Cinder in on a belt.
Use an Advanced Filter set to allow only Cinder through, blocking everything else and especially snow.
Drop the Cinder into a small conversion chamber.
Apply the Flamethrower, by hand or with careful positioning, to melt it into lava when heat is needed.
Let the rising flames do the actual burning under planter boxes or burner lines.
Add filter layers that contain the lava while still letting other materials pass.

For an auto-burner, the trick is to keep the heat in place and move the material to it. Fill a Filter with Cinder, set it to allow only Cinder, put a solid block below, and ignite the pile. When the Filter is full of lava and residue runs across it, the residue touching the belt ignites and becomes Burnt Residue. That feeds a Kinetic Slag Press without ever piping lava anywhere. Watch heat levels, because even a well-built rig slowly consumes lava and needs Cinder top-ups.

Common mistakes that ruin a lava setup

Mistake	Fix
One missing wall pixel	Double-check containment. A single gap rains lava into your main factory.
Snow mixing with water	Filter snow out early, since snow plus water becomes ice that clogs belts and tanks.
Deep, narrow pool	Build wide and shallow instead. Surface area gives you more useful flames.
No Cinder buffer	Keep a stockpile so your heat chain does not go cold mid-production.
Trying to belt or pipe raw lava	It does not work. Always use the Cinder method.
Free-rising steam	Steer it with solid blocks and vents so it does not condense and flood random areas. A grabber can pull out steam stuck where nothing else reaches.
Overloaded chamber	Feed Cinder in small batches. Too much at once makes conversion messy.

Treat lava as a consumable heat source that needs regular top-ups, and the Cinder loop stops being a hazard. Freeze it, break it, haul it as a solid, and re-melt it only where the heat has a job to do.