ImpressSeed can be purchased at impressseed.com. Claims to be:
- Fire Resistant up to 3000°F
- Corrosion resistant to acid, rusting, saltwater
- Crush proof: solid plate, deeply stamped
It was really annoying to stamp the letters into this plate due to its small size. And due to the thinness, the plate itself warped and curved inward with additional stamping along the sides. One nice aspect was that ImpressSeed includes their own jig which makes it far more manageable. However, I noted that after several hundred strikes the jig started to fail, similar to how I’ve seen other plastic jigs give in to fatigue.
Heat Stress Test
Slight discoloration around the edges but no data loss.
Corrosion Stress Test
Like some of the other titanium devices we can observe substantial pitting of the surface. A tiny amount of data loss with regard to the more lightly stamped letters. This seed phrase is certainly still recoverable.
Crush Stress Test
No additional data loss.