UL 1821

For UL 1821, laboratory is UL LLC; standard title is Thermoplastic Sprinkler Pipe and Fittings for Fire Protection, verified against its source on 2026-08-10.

Laboratory: UL LLC verified
Standard number: UL 1821 verified
Standard title: Thermoplastic Sprinkler Pipe and Fittings for Fire Protection verified

Sourceosha.gov

Verified2026-08-10

Review by2026-12-08

DatasetWhich OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

What the source says

UL 1821 | Thermoplastic Sprinkler Pipe and Fittings for Fire Protection |

— osha.gov, retrieved 2026-08-10

Source

osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/ul

Last verified against source: 2026-08-10. Due for re-check by 2026-12-08. This page as Markdown · OKF bundle · full dataset as JSON.