Your coins never touch the print.
Collectors are right to ask hard questions about plastics. Decades of coins were damaged by plasticized PVC flips, so "is 3D-printed storage safe around my collection?" deserves a straight, specific answer. This page is that answer.
- PVC-FREE
- NO PLASTICIZERS
- INERT
- MADE IN USA
- VETERAN OWNED
The holder touches the tray. The coin touches the holder.
StoneFyr slab and flip products store coins that are already sealed in NGC, PCGS, ANACS, or CAC holders, or in 2x2 flips. The printed part contacts the holder, not the metal. Whatever plastic your coin rests against was chosen by your grading service, not by us.
No PVC. No plasticizers. Ever.
The damage collectors remember came from plasticized PVC: the softening additives migrate out of the plastic over years and attack coin surfaces. Our materials contain no PVC and need no plasticizers. There is nothing formulated to leach.
PETG is the boring choice, on purpose.
PETG is the glycol-modified form of PET, the polymer the food and beverage industry runs on. It is chemically inert at room conditions, dimensionally stable, and it prints accurately enough to hold our fits. Boring chemistry is exactly what you want next to a collection.
Materials in use
| Material | What it is | Where we use it | Why it matters for storage |
|---|---|---|---|
| PETG | Glycol-modified PET, the same polymer family as food and beverage containers | The standard material across the coin storage and display lines | Chemically inert and stable at room conditions. No PVC, no plasticizers, nothing formulated to migrate out of the plastic. |
| PCTG | A tougher copolyester in the same family as PETG | Select products that need extra impact resistance | Same inert copolyester chemistry as PETG: no PVC, no plasticizers. |
| ASA | A UV-stable engineering plastic related to ABS | Select products where UV resistance matters | No PVC and no plasticizers. We do not describe ASA as inert; for coin-contact-adjacent products we use the copolyesters. |
What we do not claim
- Our trays and cases are not airtight and are not a substitute for slabs, capsules, or flips. Raw coins should be in a holder; our products organize and protect the holders.
- We do not hold third-party archival certifications, and we will not print a badge we have not earned. What we state here is the chemistry of the materials we buy and how our products contact your holders.
- Environment still matters. No storage product replaces sensible humidity and temperature control.
Will your holders fit?
The Fitment Chart maps NGC, PCGS, ANACS, and CAC slabs, 2x2 flips, and Air-Tite capsules to StoneFyr products.
More questions?
The FAQ covers compatibility and materials, or ask us directly. Material questions get answered by the person who runs the printers.