# p-isomer — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For p-isomer, cas no. is 99-99-0, verified against its source on 2026-08-05.

- **Substance:** p-isomer
- **CAS No.:** 99-99-0

## What the source says

> p-isomer | 99-99-0 | - | - | - |

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).