Signage Academy

Prohibition Signs: Complete Guide for Australian Workplaces

3 September 2026 · Jason Hennah

Prohibition Signs: Complete Guide for Australian Workplaces hero image

Prohibition signs ban unsafe actions. Use AS 1319: red circle/slash over black symbol with clear legend, placed where the decision is made.

Prohibition signs communicate a clear “do not” instruction using a simple symbol style that most workers and visitors understand at a glance. They play a critical role in hazard control by preventing unsafe actions in workshops, warehouses, construction sites, healthcare, retail and public facilities.

This guide explains what prohibition signs are, how they are designed, where to use them, suitable materials, how we manufacture them in-house, installation basics and practical ordering tips for Australian conditions.

Australian environment considerations

Australian UV, heat, dust and coastal salt can accelerate wear. Select materials and finishes to suit local conditions and cleaning regimes.

  • High UV exposure: Direct UV printing onto ACP with a suitable finish provides robust performance. Consider lamination for frequent washing.
  • Coastal and industrial sites: Use corrosion-resistant fixings and avoid dissimilar metal corrosion where possible.
  • Heat and cold cycles: Adhesive selection matters on glass, powder coat and textured masonry; high-tack or specialty adhesives may be needed.
  • Low light: In some locations, reflective films can improve visibility at night or in dim corridors.

Ordering checklist

Clear instructions reduce back-and-forth and speed production. Include the following when requesting a quote or placing an order:

  • Message and symbol: Pictogram only or pictogram plus text.
  • Substrate and finish: ACP, aluminium, corflute, vinyl decal, lamination if required.
  • Mounting method: Screws, rivets, tape, grommets, posts, or decal application.
  • Environment: Indoor/outdoor, exposure to chemicals, cleaning and abrasion.
  • Quantities and delivery locations: Site names, access details and any deadlines.
  • Artwork files: Vector where available; confirm colours and any brand requirements.

Ready when you are — get standard legends or configure customs: Prohibition Safety Signs.

Repair and refurbishment

When a sign is damaged, illegible or detached, replace it immediately. For minor issues, the following repair methods can extend service life safely:

  • Graffiti and contamination: For laminated prints, use non-abrasive graffiti removers or isopropyl alcohol. For unlaminated prints, test in an inconspicuous corner first; avoid strong solvents.
  • Edge lift on decals: Warm gently with a heat gun and re-squeegee with pressure; apply an edge-sealer where ongoing moisture is expected.
  • Scratches and chips on rigid plates: Small chips may be acceptable if the symbol and red bar are unaffected. If the ring/bar/pictogram is compromised, replace the panel.
  • Loose fixings: Refit with appropriate corrosion-resistant screws/rivets and oversized washers on mesh. If holes have elongated, shift centres or replace the plate.
  • Temporary cover-ups: Do not tape over a prohibition sign. If the control changes, remove or replace the sign to prevent mixed messages.

We supply repair kits on request: matching spare decals, cable ties, stainless fixings, VHB tape strips, alcohol wipes and an instruction sheet tailored to your substrates.

Detailed repair guidance we can include with your order:

  • Edge-sealing: apply a thin bead of clear edge-sealer to exposed decal edges in wet areas (typical cure 24 h).
  • Rebonding ACP plates: clean substrate, apply new VHB tape strips with 100% coverage near corners and 50% in-field, roll with pressure to activate bond.
  • Inspection interval: add signs to monthly housekeeping; for harsh outdoor sites, move to fortnightly quick visual checks.

How Sign Portal helps

We manufacture prohibition signs in-house using two Mimaki JFX EX flatbed UV printers, a MultiCam SM2412 CNC router, Trotec Speedy 500 laser, a large-format 230 W CO2 laser and a Roland VG-640 wide-format printer/cutter. Our 480+ m² facility with clean print rooms supports consistent colour and reliable lead times.

As a Veteran-Owned business with Local Buy credentials, we ship Australia-wide including regional and remote delivery. Repeat ordering is streamlined with customer-specific catalogues and saved artwork, helping multi-site operators keep signage consistent.

First-party results: our internal QC records show stable reds and deep blacks on ACP after prolonged outdoor exposure in SE QLD when using our UV workflow, with routine cleaning and appropriate lamination where required. Councils and utilities use our batch-labelled plates for easy reorders years later. Ask us to add QR reorder codes to your next run.

Real-world examples
  • A warehouse upgrades all no pedestrian symbols to matching ACP plates for a new forklift traffic plan.
  • A hospital replaces faded no smoking decals at all entrances with laminated vinyl for frequent cleaning.
  • A contractor orders corflute no entry signs for a 12-week shutdown and permanent ACP plates for handback.

Maintenance and inspection

Safety signs should be visible, legible and securely fixed at all times. Build them into your routine inspections and housekeeping.

  • Cleaning: Use non-abrasive cleaners and soft cloths; avoid harsh solvents on unlaminated prints.
  • Fixings: Check for loose screws, lifted vinyl edges and cracked panels; replace as needed.
  • Fading or damage: Replace at the first sign of colour loss, cracks or vandalism.
  • Site changes: Update messages when processes or layouts change to prevent mixed signals.

Want a one-click reorder path for maintenance teams? We can print a small QR code on the back of each plate linking to your pre-approved item in our system.

Key takeaways

Use prohibition signs wherever a clear “do not” instruction is needed to control risk. Choose materials to match the environment, keep symbols consistent and install for immediate visibility. With in-house UV printing, CNC routing and laser capability, we can produce durable signs across rigid plates and decals, and deliver Australia-wide.

Ready to order or standardise your site set? View our range and request a quote: Prohibition Safety Signs.

Related Sign Portal resources: Prohibition - Do Not Wear Gloves Sign · Prohibition - No Forklifts Sign · Prohibition - Fire Naked Flame Prohibited Sign

Frequently Asked Questions

What is the purpose of a prohibition sign?

It tells people what action is not allowed, using a red ring with a diagonal bar over a black pictogram to communicate the ban clearly.

Do prohibition signs need text or can the symbol stand alone?

The symbol should carry the message on its own. Short text can be added below the symbol if needed for clarity at your site.

Which material should I choose for outdoor prohibition signs?

ACP or aluminium plates are reliable outdoors. For glass or equipment, use self-adhesive vinyl; add lamination where frequent cleaning or abrasion is expected.

How do I install a prohibition sign on a mesh fence?

Use cable ties through pre-drilled holes or grommets. For temporary installations, lightweight corflute is convenient; for long-term, choose ACP.

Can you match our existing safety sign style and colours?

Yes. Supply a photo or artwork, and we’ll reproduce the symbol and colour approach consistently across the required substrates.

Do you ship to regional and remote locations?

Yes. We ship Australia-wide, including regional and remote areas. Provide site access notes and deadlines when ordering.

What artwork format is best for crisp symbols?

Vector files (AI, PDF, EPS) produce the sharpest results. Outline fonts and include any colour notes when submitting artwork.

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