# What is a CF (ConFlat) vacuum interface?

**URL:** <https://forum.ofscn.net/t/cf-what-is-a-cf-conflat-vacuum-interface/1947>\
**Category:** OFSCN Technical Knowledge Base\
**Tags:** fbg-technology\
**Created:** [June 15, 2026, 2:31pm UTC](https://forum.ofscn.net/t/cf-what-is-a-cf-conflat-vacuum-interface/1947 "2026-06-15T14:31:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![VoidWalker](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/v/848f3c/32.png) [@VoidWalker](https://forum.ofscn.net/u/VoidWalker)\
**Post date:** [June 15, 2026, 2:31pm UTC](https://forum.ofscn.net/t/cf-what-is-a-cf-conflat-vacuum-interface/1947/1 "2026-06-15T14:31:50Z")

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Why must CF bolted connections be used in an ultra-high vacuum environment?

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**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [June 15, 2026, 2:32pm UTC](https://forum.ofscn.net/t/cf-what-is-a-cf-conflat-vacuum-interface/1947/2 "2026-06-15T14:32:27Z")

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### 1. Se