Keep Locked Shut - Safety Signs by Caledonia Signs

“Keep Locked Shut” signs are important because they help maintain security, safety, and fire protection by clearly instructing that specific doors must remain locked when not in use. These signs are particularly critical for doors leading to hazardous areas, secure zones, plant rooms, storage rooms with flammable materials, or areas that must maintain fire resistance (such as fire-rated compartment doors). Locking these doors helps prevent unauthorised access, tampering, or accidental exposure to risks.

They also play a vital role in fire safety, especially when installed on fire doors designed to slow the spread of fire and smoke. A door that’s left open or unsecured can render fire safety systems ineffective, endangering occupants and property. The sign reminds staff and visitors that these doors must stay locked to perform their intended protective function.

These signs should be installed directly on the relevant doors in environments such as industrial facilities, utility rooms, maintenance areas, data centres, chemical storage spaces, and fire escape doors. Placement at eye level ensures visibility and reinforces routine safety checks.

By using “Keep Locked Shut” signs, organisations reduce the risk of accidents, theft, and safety breaches. These signs promote compliance with internal policies and fire safety standards, contributing to a more secure and well-managed environment.

Materials Explained

Below is a more detailed description of the materials this particular safety sign is available in. Helping you decide which sign option is most suitable for your application.

Rigid Plastic: This lightweight, gloss white PVC is resistant to weather, moisture, chemicals, and general wear and tear, making it suitable for harsh environments. Its smooth, solid surface allows for crisp printing of text and graphics, enhancing readability and visual impact. Businesses who choose Rigid Plastic signs benefit from fewer replacements and minimal maintenance, making it a practical investment for reliable and effective safety signs.

Self-Adhesive Vinyl: Self-adhesive vinyl is easy to apply and it’s budget-friendly. Its adhesive backing allows for easy application to a variety of surfaces such as glass, metal, plastic, and painted walls, which simplifies installation and reduces setup time. Self-adhesive vinyl provides a clean, professional finish that suits many indoor environments including offices, retail, industrial sites, and vehicles. It is more affordable than many other material types and allows for custom shapes, colours, and graphics.

Rigid Plastic with Self Adhesive Backing: Our standard rigid plastic is a gloss white, smooth, solid material that allows for crisp printing of text and graphics - resistant to weather, moisture, chemicals. A strong peel & stick adhesive backing eliminates the need for tools or hardware, providing a long-lasting bond to most smooth surfaces, saving time and labour costs.

5. Anodised Aluminium: A fully recyclable, premium material for signage, offering a combination of durability, aesthetics, and performance. A lightweight yet extremely strong material which won’t rust or peel. It is sleek, professional looking and has a smooth satin finish. A smart, 100% recyclable, sustainable option for environmentally conscious projects.

5. Roll / Sheet of Labels: Manufactured from self-adhesive vinyl, our roll / sheets of labels are easy to apply and are budget-friendly. The adhesive backing on each label allows for easy application to a variety of surfaces making them ideal for high-volume tasks such as product packaging, shipping, inventory tagging, or compliance labelling.