# What material is Metal Foil?

**URL:** <https://forum.digikey.com/t/what-material-is-metal-foil/72351>\
**Category:** Q&A\
**Created:** [September 30, 2026, 6:31pm UTC](https://forum.digikey.com/t/what-material-is-metal-foil/72351 "2026-09-30T18:31:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![brianw](https://avatars.discourse-cdn.com/v4/letter/b/b2d939/32.png) [@brianw](https://forum.digikey.com/u/brianw)\
**Post date:** [September 30, 2026, 6:31pm UTC](https://forum.digikey.com/t/what-material-is-metal-foil/72351/1 "2026-09-30T18:31:08Z")

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------Question for [KRL2012-KIT-FILE](https://www.digikey.com/en/products/detail/susumu/KRL2012-KIT-FILE/5972634) Please Put your question below------

What metals are used in the metal foil resistors in the above kit?

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**Author:** ![jon\_11475](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/jon_11475/32/73382_2.png) [@jon\_11475](https://forum.digikey.com/u/jon_11475)\
**Post date:** [October 2, 2026, 3:26pm UTC](https://forum.digikey.com/t/what-material-is-metal-foil/72351/2 "2026-10-02T15:26:43Z")

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Hello @brianw

Thanks for your question. Susumu states [HERE](https://www.susumu.co.jp/en/environment/material/) that the resistive element in their chip resistors is a NiCr (nickel-chromium) based alloy that does not contain hexavalent chromium, and that the electrodes are lead-free tin. They also state the ceramic substrate contains no lead.

This is Susumu’s general statement for their chip resistors, as they don’t list the foil alloy for the KRL series specifically.