Hazard Communication
Corrosion Pictogram
Acid & Base Hazards
Acid & Base Hazards
OSHA 1910.1200 · GHS Corrosion = Skin/Eye Corrosive & Metal Attack Hazards · pH <2 or >12.5
The GHS corrosion pictogram means the product will actively destroy tissue or metal on contact. On NYC construction sites, corrosive chemicals are common — acid-based concrete cleaners, masonry etching compounds, epoxy hardeners, and certain waterproofing agents. Chemical burns from corrosives are among the most severe injuries a construction worker can suffer, and they require immediate treatment.
What the Corrosion Symbol Means
- Skin corrosion: Destroys skin tissue on contact — visible injury within 4 hours of exposure. pH below 2 (strong acid) or above 12.5 (strong base)
- Eye corrosion: Can cause permanent blindness — the eye is far more vulnerable than skin. Any splash requires immediate flushing
- Respiratory corrosion: Some corrosive vapors (muriatic acid, ammonia) attack the airways — inhalation can cause pulmonary edema hours after exposure
- Metal corrosion: Indicates the product attacks metals — a storage and container compatibility concern
Common Corrosives on NYC Construction Sites
- Muriatic (hydrochloric) acid: masonry cleaning, efflorescence removal — very common and frequently mishandled
- Sodium hydroxide (lye): drain cleaning, concrete form release additives
- Epoxy hardener components: skin sensitizer with corrosive properties
- Battery acid (sulfuric acid): from equipment batteries
PPE and Handling
- Neoprene or PVC gloves (not nitrile for strong acids/bases) — check SDS Section 8
- Safety goggles (not glasses) — chemical splash goggles form a seal around the eye
- Immediate access to eyewash station required when working with corrosives
First Aid — Corrosive Contact
- Skin: flush with large amounts of water for at least 15–20 minutes. Remove contaminated clothing while flushing
- Eyes: flush immediately at eyewash station for 15 minutes minimum. Do not rub. Call 911 for eye exposures
- Eyewash station must be within 10 seconds of travel from any corrosive use area — verify location today
Discussion Questions
- Where is the nearest eyewash station to where corrosives are being used on this site?
- Why are safety glasses NOT sufficient when working with liquid corrosives? What is the correct eye protection?
- A worker gets muriatic acid on their arm. They say "it just stings." What do you do and how long do you flush?
- What PPE does the SDS specify for the specific corrosive chemicals in use on this site today?
Sign-Off
Project Address
Date
Time
Foreman / Supervisor
SSM / SSC Name & License No.
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