---
type: threshold
id: ortho
asset: workplace-exposure-limits
title: "(ortho) — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "(ortho) | 528-29-0 | - | - | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "(ortho)"
cas_number: "528-29-0"
verified: true
---
**Substance:** (ortho)

**CAS No.:** 528-29-0

> (ortho) | 528-29-0 | - | - | - |

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