#TrellidorAnswers: How Safe Are Clear Burglar Bars?

If there’s one thing criminals are relentless with, it’s finding new innovative ways to break past security barriers. As specialists largely responsible for your protection, it’s our job to be ahead of all attempts that might endanger your safety. One of the most frequent questions we receive from our customers remains “How safe are Clear Burglar Bars?” – Let’s get to it.

What are Clear Burglar Bars?

Clear Burglar Bars, otherwise known as Transparent Burglar Bars, are invisible burglar bars made from polycarbonate. Polycarbonates are a group of thermoplastic polymers containing carbonate groups in the carbonate structures. They are easily worked, moulded and thermoformed in different grades on the basis of the application desired.

Products made from polycarbonates carry the following qualities:

  • High impact & fracture resistance.
  • Better heat resistance (Stable over a range of temperatures with a glass transition temperature of about 147°C to 155 °C).
  • Durable with toughness.
  • Easy to handle and relatively light.

The thermoplastic used to manufacture Transparent Burglar Bars is also used to create airplane windows, bulletproof glass, sound walls, electrical & electronics, and other personal security applications.

How strong are Clear Burglar Bars?

The above-mentioned applications give insight into how solid and secure Clear Burglar Bars are. High-density polycarbonate bars are stronger than steel and provide secure levels of protection. They have high impact-resistance and low scratch-resistance. This thermoplastic that is used for airplane windows and bulletproof glasses, as remarked about already, also cannot be snapped when bent out of shape – unlike acrylic or perspex. The thickness varies from 5-7mm.

Polycarbonate is a virtually indestructible material, which is the primary reason why it is used in high demand applications such as cockpits of fighter jets, shields used by riot control police, Formula One cars, and high-speed trains. It boasts high tensile strength and its burglar bars are also flexible. Even cutting the bar at a single point won’t provide access, as the part will snap back into its place.

Our engineers redesigned Polycarbonate bar burglar proofing, adding a full-frame that secures the bars in place, increasing their stability and ability to resist attack. The unit is secured into the substrate surrounding the window, rather than merely being screwed into the window frame.

See the attack test we conducted to prove durability.

Clear Burglar Bars Benefits

  • Excellent lifespan
  • Virtually invisible
  • Aesthetically neat & attractive
  • Customized gap sizes
  • Strong & flexible
  • Minimal maintenance
  • Complements modern interior design
  • Effective in keeping out baboons and monkeys

Trellidor’s neat Poly Guard design and strengthening features provide you with protection as well an attractive, see-through installation. For more on features & any other remaining questions, Contact Us.


En.wikipedia.org. (2019). Polycarbonate. [online] Available at: Polycarbonate [Accessed 17 Oct. 2019].

Corrosionpedia. (2019). What is a Polycarbonate? – Definition from Corrosionpedia. [online] Available at: What is a Polycarbonate?  [Accessed 17 Oct. 2019].

SecurityPro. (2017). Polycarbonate Transparent Burglar Bars in South Africa.

Available at: Polycarbonate Transparent Burglar Bars in South Africa [Accessed 17 Oct. 2019].


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