Caustic Substance Warning Sign HS0061

Caustic Substance Warning Sign (HS0061)

The Caustic Substance Sign (HS0061) alerts crew and visitors to areas where corrosive liquids, alkalis, or caustic chemicals are stored, handled, or transferred aboard a vessel. It reproduces the standard ISO 7010 pictogram for caustic substances — a black-bordered warning triangle on a yellow ground showing liquid corroding a hand and a flat surface, the internationally recognised symbol for corrosive-material danger. This caustic substance sign gives an immediate, language-free instruction that skin, eyes, and equipment can be damaged on contact, so anyone entering the marked space knows to take precautions before proceeding.

Within the Hazard Signs range, HS0061 sits alongside our other chemical and process-hazard pictograms, forming a consistent visual language across a vessel’s safety signage plan. A caustic substance sign of this type is typically fitted at chemical lockers, battery-charging rooms, boiler and descaling stations, and tank spaces where caustic soda or other alkaline agents are dosed. Wherever corrosive liquids are present on deck or below, this sign gives crew a clear, at-a-glance warning before handling begins.

Like the rest of the Hazard Signs catalogue, HS0061 is produced on rigid, marine-grade substrate or as a durable self-adhesive vinyl, with a photoluminescent option available for spaces where lighting may fail. The print and substrate are formulated to resist saltwater spray, UV exposure, and the humid, corrosive atmosphere typical of engine rooms and chemical stores, so the caustic substance sign continues to read clearly after years of shipboard service.

Why Caustic Substance Hazards Matter

Caustic and corrosive chemicals cause some of the most severe injuries recorded aboard ships — chemical burns to skin and eyes, respiratory damage from fumes, and material degradation that can weaken decks, fittings, and protective equipment. An unmarked or poorly marked storage or handling area increases the chance that a crew member enters without gloves, goggles, or an understanding of the correct handling procedure, turning a routine task into a serious incident. A clearly posted caustic substance sign removes that ambiguity, prompting the correct PPE and handling response before contact occurs.

Consistent use of this pictogram also supports the vessel’s broader safety culture. It gives officers a fixed reference point during safety rounds, helps new crew and contractors recognise the hazard immediately, and demonstrates to auditors that corrosive-material risks have been identified and controlled at the point of exposure.

Compliance and Certification

HS0061 reproduces a registered ISO 7010 safety sign, the international standard referenced by IMO shipboard safety signage guidance for graphical symbols, colours, and shapes used at sea. Fitting recognised, standardised pictograms such as this caustic substance sign supports a vessel’s general SOLAS safety obligations, and is the kind of detail Port State Control officers and classification society surveyors check during signage audits. For the full specification of the underlying pictogram, see the ISO website.

Installation Recommendations

Mount the caustic substance sign at eye level directly on or beside the door, hatch, cabinet, or bulkhead where the corrosive material is stored or used, ensuring it is the first thing a crew member sees before entry. On tanks, drums, or dosing units, position the sign close to the access or fill point rather than on a distant wall, and duplicate it at multiple approach routes in larger compartments such as engine rooms or laundries so the warning cannot be missed.

• Reproduces a genuine, registered ISO 7010 pictogram for caustic and corrosive-material hazards
• Available in rigid marine-grade board, self-adhesive vinyl, or photoluminescent finish
• Engineered to withstand saltwater spray, UV exposure, and humid engine-room conditions
• Bold black-on-yellow warning format for instant, language-free recognition
• Suited to chemical stores, battery rooms, boiler bays, and tank dosing points aboard any vessel

Fit HS0061 wherever caustic or corrosive chemicals are stored or handled to keep crew informed and your vessel inspection-ready. Browse the full Hazard Signs range for related chemical and process warnings, or check our Fire Fighting Signs for complementary emergency-response signage.