Danger Highly Flammable signs warn you where flammable substances may ignite if exposed to sparks, heat or naked flames. They help staff, contractors and visitors recognise higher-risk stores, workshops and handling areas before unsafe behaviour starts.

Where Danger Highly Flammable Signs Should Be Positioned

You should install these signs at flammable stores, chemical cupboards, workshop doors, fuel handling points, spray areas and waste solvent locations. Place them before someone reaches the hazard so the warning is seen before ignition sources, hot work or careless handling can create danger.

Practical Viewing Distance For Clear Warnings

Use smaller signs for close-range doors and cupboards, and larger formats where people approach from yards, corridors or vehicle routes. Keep the sign clear of clutter and mount it at natural eye level.

Sign size	Best viewing use	Typical distance
H 150 x W 125 mm	Cupboards, small stores, close approach doors	Up to 2–3 metres
H 297 x W 210 mm / H 420 x W 297 mm	Workshops, stock rooms, chemical handling points	Around 5–10 metres
H 400 x W 600 mm	External approaches, fences, yards, wider work areas	Around 10–20 metres

What These Flammable Hazard Signing Helps You Achieve

When placed at the decision point, this sign helps people slow down, check what is stored nearby and avoid actions that could introduce sparks, heat or flame into a higher-risk area.

✅ Staff recognise flammable storage before entering or starting work.

✅ Contractors see the hazard before using tools, heat or electrics nearby.

✅ Visitors are less likely to treat chemical or fuel areas as ordinary storage.

Danger Highly Flammable Sign Technical Details

Sign message: Danger Highly Flammable
Sign type: hazard warning
EN ISO 7010 code: W021
Conforms to EN ISO 7010
Conforms to BS 5499 sign regulations
Pictogram: black flame inside yellow warning triangle
Background colour: yellow
Text colour: black

Symbol colour: black
Shape: rectangle
Orientation: portrait
Materials: rigid plastic or self-adhesive vinyl
Finish: glossy film surface
Non-photoluminescent
Non-reflective
Supplied individually

Size option: H 100 x W 250 mm
Size option: H 150 x W 125 mm
Size option: H 210 x W 148 mm
Size option: H 297 x W 210 mm
Size option: H 420 x W 297 mm
Size option: H 300 x W 500 mm
Size option: H 400 x W 600 mm
Display area: indoors or outdoors

ⓘ Installation Guidance

Installing Danger Highly Flammable Signs Without Weakening The Warning

Placement errors that reduce impact

❌ Fitting the sign after the hazard has already been reached.

❌ Mounting it behind stock, shelving, bins or open doors.

❌ Using a small sign where people approach from a wider yard or route.

When this sign is the wrong choice

❌ Do not use it for oxidising substances where a different hazard applies.

❌ Do not rely on it alone where smoking or naked flames must be prohibited.

❌ Do not use damaged, faded or dirty signs in areas with serious ignition risk.

Better fitting decisions on site

✅ Use vinyl on smooth, dry, clean surfaces for fast internal application.

✅ Use rigid plastic where the sign needs a firmer wall, fence or door fixing.

✅ Place the sign at eye level on the approach side of the hazard area.

? Customers Questions

Danger Highly Flammable Signs Questions Answered

What are Danger Highly Flammable signs used for? They warn people that flammable substances are stored, handled or present nearby, helping them avoid sparks, flames, smoking and careless hot work.

Where should you fit this sign? Fit it at the entrance to chemical stores, fuel rooms, workshop cupboards, flammable waste points, spray areas and any place where the warning must be seen before entry.

Should you choose rigid plastic or self-adhesive vinyl? Choose rigid plastic for walls, fences and more exposed fixing points. Choose self-adhesive vinyl for smooth, clean doors, cupboards and internal surfaces.

Does the W021 symbol matter? Yes. W021 is the EN ISO 7010 warning symbol for flammable material, helping people recognise the hazard quickly even before reading the wording.

Can this sign replace fire controls or storage procedures? No. It supports your risk controls, but it should sit alongside safe storage, segregation, ignition control, staff training and suitable fire arrangements.

✔ Features & Benefits

Danger Highly Flammable Signs Features And Practical Benefits

Features

✓ ISO W021 flammable material warning symbol
✓ Clear “Danger Highly Flammable” message
✓ Rigid plastic and adhesive vinyl choices
✓ Multiple sizes for doors, stores and wider approaches

Benefits

✓ Helps you warn people before they enter higher-risk areas
✓ Reduces confusion around fuels, solvents and combustible stock
✓ Lets you match fixing style to the surface and location
✓ Supports clearer control of ignition risks in busy workplaces

Related signs for stronger flammable risk control

For a broader hazard reminder, you may prefer highly flammable hazard signs where the message needs to stay simple. Useful for general storage, handling and production areas.

If smoking and flames must both be controlled, choose danger highly flammable no smoking no naked lights signs. These suit areas where ignition sources need firm prevention.

For storage-specific risk marking, compare danger highly flammable store notices where combustible goods are kept. Helpful for doors, cabinets and dedicated store entrances.

Where outdoor visibility matters, danger highly flammable material reflective signs give you a more noticeable option. Useful around yards, delivery points and external stores.

For more wording options, browse highly flammable chemical hazard warning signage. It helps you match the sign message to the real site risk.

🚚 Delivery

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