What Is Jesmonite? The Material Behind Our Vessels
Every Petrichor vessel is made from Jesmonite AC100. If you've never heard of it, you're not alone — it's not a household name. But it's the reason our vessels feel the way they do: heavy, cool, honest. Like holding a piece of stone.
Here's what it is, where it comes from, and why we chose it over every other material we considered.
What Jesmonite Is
Jesmonite is a water-based composite material made from a gypsum-based powder and an acrylic resin. It was developed in the UK in the 1980s as a safer, more versatile alternative to fibreglass — one that could be used indoors, without the toxic fumes, and with a much wider range of finishes.
It's used in architectural restoration, museum conservation, film and theatre set construction, and high-end interior design. When you see a replica of a classical sculpture in a museum lobby, or a decorative column in a hotel that looks like stone but isn't, there's a good chance it's Jesmonite.
The AC100 formulation — the one we use — is the standard for fine casting work. It produces a dense, durable surface with a stone-like quality that no other material quite replicates.
How We Work With It
Every vessel starts as a mixture of Jesmonite powder and liquid, combined by hand in precise ratios. The mixture is poured into a mold, where it begins to cure. Once demolded, each piece is sanded by hand to smooth the surface and refine the edges, then sealed to protect the finish.
The entire process — mixing, pouring, demolding, sanding, sealing — is done by one person, in one studio, one piece at a time. There is no production line. There is no batch automation. Each vessel is handled individually from start to finish.
Why Surface Variation Is Not a Flaw
Jesmonite is an honest material. It shows how it was made. Small variations in surface texture, subtle differences in tone, the occasional mark from the mold — these are not defects. They are evidence of the process. They are what makes each piece unique.
No two Petrichor vessels are identical. That's not a limitation of the material. It's the point.
We stamp an edition number into each vessel permanently — into the material itself, not applied as a label. That number doesn't wash off. It doesn't peel. It's part of the piece. It's a record of when it was made and where it sits in the sequence of things we've made.
Why Jesmonite and Not Something Else
We considered ceramic. We considered concrete. We considered resin. None of them gave us what Jesmonite gives us: the weight, the surface quality, the workability, and the durability, all in a material that's water-based and safe to work with indoors.
Jesmonite is also genuinely durable. It's designed to last — in buildings, in museums, in spaces that need to hold up over decades. A Petrichor vessel is not a disposable container. It's a piece you keep. You refill it. It lives on your shelf for years. The material needed to be worthy of that intention. Jesmonite is.
What You're Holding
When a Petrichor vessel arrives at your door, you're holding something made from the same material used to restore historic buildings and preserve museum collections. It was mixed, poured, sanded, and sealed by hand. It has a number stamped into it that no other piece shares.
It is heavy in the hand. Cool to the touch. Honest about how it was made.
That's what we wanted. That's what Jesmonite makes possible.