Danger Highly Flammable Symbol Signs show the W021 flame warning symbol with clear danger wording, helping you alert staff, contractors and visitors where flammable substances are stored, handled or accessed so fire risk is understood before work begins.

Where Danger Highly Flammable Symbol Signs Should Be Installed

You should install these signs at entrances, cupboards, cabinets, storage rooms, workshop doors and handling points where highly flammable materials may be present. Place them before the risk area so people see the warning before opening, entering or starting work.

Practical Viewing Distance for These Flammable Warning Signs

Use the smaller size for close-range cupboard or door reading. Choose the larger size where people approach from a corridor, yard or workshop aisle and need the warning earlier.

Sign size	Best viewing use	Practical distance
H 100 x W 250 mm	Cupboards, cabinets and close doors	Up to around 3 metres
H 300 x W 500 mm	Stores, workshops and approach routes	Around 6–10 metres

What Should Improve After This Sign Is Fitted

Once installed in the right place, this sign helps people pause before entering or handling materials, reducing careless ignition behaviour around flammable substances.

✅ Staff recognise the flammable hazard before opening storage areas

✅ Contractors are prompted to avoid sparks, heat and unsafe tasks nearby

✅ Visitors receive a clear warning before entering controlled work areas

Technical Details for Choosing the Right Flammable Warning Sign

Sign message: "Danger Highly Flammable"
EN ISO 7010 code: W021
Conforms to EN ISO 7010
Conforms to BS 5499 sign regulations
Sign type: hazard warning
Shape: oblong
Orientation: landscape

Size: H 100 x W 250 mm
Size: H 300 x W 500 mm
Materials: rigid plastic or self-adhesive vinyl
Background colour: yellow
Text colour: black
Symbol colour: black
Pictogram: black flame inside yellow warning triangle

Finish: glossy film surface
Non-photoluminescent
Non-reflective
Supplied as a single sign
Display area: indoors or outdoors
Vinyl fixing: adhesive backing
Rigid plastic fixing: separate fixings required

ⓘ Installation Guidance

Installing Flammable Warning Signs Without Creating Blind Spots

❌ Placement mistakes that weaken the warning

❌ Fitting the sign after the hazard has already been reached

❌ Mounting it too low behind stored items, bins or equipment

❌ Using the small size where people approach from several metres away

❌ Situations where this sign is the wrong choice alone

❌ Areas needing a strict no smoking or no naked flames instruction

❌ Emergency routes where a safe condition sign is required instead

❌ Dark escape routes needing a photoluminescent sign format

✅ Better fitting choices for clear recognition

✅ Fit at eye level on the approach side of the risk area

✅ Use vinyl for smooth clean surfaces and rigid plastic for tougher fixing points

✅ Keep the sign close to the flammable store, cabinet or handling position

? Customers Questions

Danger Highly Flammable Symbol Signs questions answered

What are Danger Highly Flammable Symbol Signs used for? They warn people that highly flammable substances may be present, helping them avoid ignition sources before entering, opening or handling materials.

Should I choose rigid plastic or self-adhesive vinyl? Use vinyl on clean, smooth cupboards, doors or cabinets. Choose rigid plastic where you need a more durable fixed sign on walls, fences or external surfaces.

Is the W021 flame symbol important? Yes. W021 is the recognised EN ISO 7010 warning symbol for flammable material, so it helps people understand the hazard quickly without relying only on text.

Where should this sign be placed for best effect? Place it before the risk is reached, such as on the entrance door, storage cupboard, chemical cabinet or wall beside the handling point.

When is this sign not enough on its own? If smoking, naked flames or specific actions must be banned, you should also use clear prohibition signs alongside the flammable warning.

✔ Features & Benefits

Danger Highly Flammable Symbol Signs Features and User Benefits

Features

✓ W021 flame pictogram supports instant hazard recognition
✓ Danger heading gives the warning stronger visual priority
✓ Landscape layout suits doors, cabinets and store entrances
✓ Two material choices cover smooth surfaces and fixed positions

Benefits

✓ Helps you warn people before they enter a flammable risk area
✓ Reduces confusion where materials may ignite from heat or sparks
✓ Supports safer behaviour from staff, visitors and contractors
✓ Lets you choose a format that suits the surface and location

Compare symbol and text flammable warnings

If you need wording as well as the symbol, choose danger highly flammable text signs for clearer instruction. Helpful where visitors or new staff need the hazard explained quickly.

For general flame-risk marking, plain highly flammable warning signs keep the message simple and direct. Useful across stores, workshops and chemical handling points.

Where the risk is linked to storage, consider danger highly flammable store entrance signs. These help identify where combustible materials are kept before people enter.

For a warning-led alternative, warning highly flammable safety signs may suit less severe wording needs. Good for areas where awareness is the main priority.

To review the full range, see highly flammable symbol and text sign options. This gives you a practical way to compare visual and written hazard messages.

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