Hang this poster beside the chemical storeroom door, so anyone can read the diamond posted there.
What is on the poster
Written for firefighters: the hazards of what is inside, at a glance, from the door.
| Section | What it rates |
|---|---|
| Blue, left | Health. 4: may be fatal on short exposure. 0: no unusual hazard. |
| Red, top | Flammability. 4: flammable gas or extremely flammable liquid. 0: will not burn. |
| Yellow, right | Instability. 4: the most reactive. 0: normally stable. |
| White, bottom | Special hazards, no number: OX oxidizer; W crossed out, reacts with water, use no water; SA simple asphyxiant gas. |
Posting it
- On two exterior walls, and at each access point to a room or area (NFPA 704, section 4.3).
- One diamond for a room of many chemicals: each number is the highest hazard present in that category, from a documented inventory review.
- The diamond on the door never replaces the HazCom label on each container.
The poster draws a labelled diamond reading 1, 0, 0 with a blank white square: a slight health hazard, will not burn, normally stable, no special hazard. The one thing to watch is mild exposure.
Built to the Science Safety Teaching Standard
This poster carries the SSTS mark. Like every Science Safety course, it is built to the Science Safety Teaching Standard (SSTS): every rule on it is taken from the body that governs it, at its current edition, and the source is printed on the poster, so you can check it yourself.
Stay current
When you get this poster, it is saved to your Science Safety account. If we revise the poster, or the Fire Safety in the Science Lab module it comes from changes, we will email you, and the latest version will be waiting under Downloads in your account. Every revision carries its revision number and date at the bottom of the poster, so you can tell at a glance whether the copy on your wall is current.
Printing and hanging
- One-page PDF, US letter (8.5 by 11 inches).
- White background, so it prints clearly on any office or classroom printer without using much ink.
- Hang it beside the storeroom door, under the diamond itself.
- The QR code in the blue title band opens this page, so anyone can get their own copy.
- The QR code at the bottom opens the Fire Safety in the Science Lab module.
Learn more
The Fire Safety in the Science Lab module teaches the full topic this poster comes from.
Sources:
- NFPA 704, 2027 edition – National Fire Protection Association (reviewed October 2, 2026)
- The Importance of Signs and Symbols in Fire and Life Safety (2025) – National Fire Protection Association (reviewed October 2, 2026)
- OSHA 3678, Comparison of NFPA 704 and HazCom 2012 Labels – Occupational Safety and Health Administration (reviewed October 2, 2026)
- School Chemistry Laboratory Safety Guide – CPSC, CDC and NIOSH (reviewed October 2, 2026)
Poster SSP-0051, Rev. 1, October 2026.
