UL 1821
For UL 1821, standard title is Thermoplastic Sprinkler Pipe and Fittings for Fire Protection; nrtl is NSF; laboratory is NSF International; status is currently recognized, recorded from its source on 2026-08-10.
- Test standard
- UL 1821 verified
- Standard title
- Thermoplastic Sprinkler Pipe and Fittings for Fire Protection verified
- NRTL
- NSF verified
- Laboratory
- NSF International verified
- Status
- currently recognized our reading
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
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/nsf