# tert-Butyl acetate — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For tert-Butyl acetate, cas no. is 540-88-5; pel (ppm) is 200; pel (mg/m³) is 950, verified against its source on 2026-08-05.

- **Substance:** tert-Butyl acetate
- **CAS No.:** 540-88-5
- **PEL (ppm):** 200
- **PEL (mg/m³):** 950

## What the source says

> tert-Butyl acetate | 540-88-5 | 200 | 950 | - |

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### PEL (mg/m³)

osha.gov says pel (mg/m³) is **950**, as of 2026-08-05.

> tert-Butyl acetate | 540-88-5 | 200 | 950 | - |

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

dir.ca.gov says pel (mg/m³) is **955**, as of 2026-08-05.

> 540885 | | tert-Butyl acetate | 200 | 955

Source: https://www.dir.ca.gov/title8/5155.html


## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- https://www.dir.ca.gov/title8/5155.html

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/).