When researching transparent or clear burglar bars, many homeowners ask: “What’s the difference between Polycarbonate and Perspex?”
And more importantly: “Which material is stronger and safer for home security?”
Although both materials look similar, they are not the same — especially when it comes to security applications.
What Is Polycarbonate?
Polycarbonate is a high-impact thermoplastic used in:
- Riot shields
- Bullet-resistant glazing
- Aircraft windows
- Safety goggles
- Machine guards
It is widely known as an “unbreakable” material because of its exceptional impact resistance. In the security industry, UV-treated polycarbonate is the preferred material for transparent burglar bars because it combines strength with crystal-clear visibility.
What Is Perspex?
Perspex (also known as acrylic) is a rigid plastic commonly used for:
- Retail displays
- Picture frames
- Signage
- Light fixtures
- Decorative panels
While Perspex offers good clarity and appearance, it is more brittle than polycarbonate and can crack or shatter under heavy impact. For decorative use, Perspex performs well. For security use, it is not ideal.
Strength Comparison
1. Impact Resistance
Polycarbonate
- Extremely high impact resistance
- Can absorb significant force without cracking
- Used in safety shields and protective barriers
Perspex
- Rigid but brittle
- Can crack under heavy force
- Not designed for impact protection
For burglar bars, impact resistance is critical.
Polycarbonate is significantly stronger.
2. Heat & Fire Performance
Polycarbonate
- Higher working temperature range (up to approx. 120°C)
- Often self-extinguishing
- Better fire performance
Perspex
- Lower softening point
- More likely to ignite and burn
- Less suitable for high-heat environments
Security materials must withstand environmental stress — especially in hot South African climates.
3. Drilling & Installation
Polycarbonate
- Can be drilled and cold-bent without cracking
- More forgiving during installation
- Suitable for secure anchoring systems
Perspex
- Prone to cracking if drilled too close to the edges
- Requires heat-bending
- Less durable at fixing points
For transparent burglar bars, installation strength is just as important as material strength.
Which material does ClearBars® use?
Transparent burglar bars are manufactured from UV-treated polycarbonate, not Perspex. The reason for this is because security applications require:
- Extreme impact resistance
- Structural durability
- Long-term clarity
- Resistance to yellowing
- Strong anchoring capability
Perspex simply does not meet the strength requirements needed for residential security.
Do polycarbonate burglar bars turn yellow?
Premium UV-treated polycarbonate is specifically engineered to resist fading and ageing. Lower-quality acrylic (Perspex-type materials) may discolour over time — especially in direct sunlight.
When investing in transparent burglar bars, always confirm:
- UV protection rating
- Warranty period
- Material origin
- Professional installation
Why material choice matters for home security
Many imitation “clear burglar bars” on the market use acrylic or lower-grade plastics to reduce cost. Visually, they may look similar at first. Structurally, they are not. Cheaper material means lower impact resistance.
Security products should never be selected based on appearance alone.
The internal strength of the material determines whether your home is truly protected.
To ensure your material is polycarbonate, ask for material certification and warranty documentation. Reputable suppliers will confirm the exact specification.
Final Verdict: Polycarbonate vs Perspex
If you are installing transparent burglar bars for security purposes, polycarbonate is the only appropriate choice. Perspex is excellent for display and decorative use — but not for impact protection.
When it comes to protecting your home, material strength should never be compromised.
ClearBars® manufactures and installs high-quality UV-treated polycarbonate transparent burglar bars designed for durability, clarity and long-term security.
Contact our team today for a professional assessment and quote.
