In cooperation with decentral-investieren.de we offer a metal plate for engraving, on which you can safely store your seed phrase (12 or 24 passwords/private key of the wallet). The plate is made of 1.4301 V2A stainless steel and has the following characteristics:
1mm stainless steel
7.5 cm wide
Fire resistant (melts at 1400-1455°)
Since an apartment fire is around 1100°C, source 1 , source 2 , stainless steel 1.4301 should provide the best protection against fire. The thickness of 1mm was also chosen to reduce mechanical deformation due to collapse or debris. In addition, this alloy enables easy processing with a standard engraving pen.