# Ex q / qb / qc — Certification marks and hazardous-area classifications: cross-market equivalences

For Ex q / qb / qc, meaning is Quartz/Sand Filled; governing standard / law is EN/IEC 60079-5, verified against its source on 2026-08-11.

- **Designation:** Ex q / qb / qc _(verified: appears in the quote below)_
- **Meaning:** Quartz/Sand Filled _(verified: appears in the quote below)_
- **Governing standard / law:** EN/IEC 60079-5 _(verified: appears in the quote below)_

## What the source says

> Quartz/Sand Filled - Ex q / qb / qc EN/IEC 60079-5

## Source

- https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [Certification marks and hazardous-area classifications: cross-market equivalences](https://referencesource.org/certification-standards-equivalence/).