Special Laminated Glass

Standard laminated glass—glass bonded with PVB or SGP—has long been the benchmark for safety glazing. But some architectural and industrial applications demand more than impact resistance and UV protection. They require electromagnetic shielding, anti‑static properties, riot‑grade security, or ultra‑lightweight interlayers with exceptional clarity.

Special laminated glass meets these advanced requirements. By replacing conventional polymer interlayers with PET (Polyethylene Terephthalate) or embedding aluminum mesh / copper mesh between glass plies, manufacturers can produce laminated glass that not only holds fragments after breakage but also blocks electromagnetic interference, dissipates static charge, or withstands repeated violent impacts.

This guide explores two families of special laminated glass—PET‑based laminates and metal‑mesh laminates—their technical characteristics, performance advantages, and the architectural, industrial and security applications where they excel.

Part 1: PET Laminated Glass – Lightweight Strength and Acoustic Performance

What Is PET Laminated Glass?

PET laminated glass is a safety glass product composed of two or more glass sheets bonded with one or more interlayers of polyethylene terephthalate (PET) film. The lamination process uses the same high‑temperature, high‑pressure autoclave cycle as conventional PVB lamination, but the interlayer material is a specially engineered PET film rather than polyvinyl butyral.

PET is the same family of polyester used in high‑performance security films, magnetic tape, and food‑grade bottles. For glass lamination, PET is formulated to offer excellent optical clarity, high tensile strength, outstanding weatherability, and superior acoustic damping.

How PET Laminated Glass Is Made

The production of PET laminated glass follows a similar sequence to conventional laminated glass:

1. Glass sheets are cut to final dimensions, edges are ground and polished, and any holes or notches are drilled.

2. One or more layers of PET film (typically 0.15 mm to 0.50 mm per layer) are placed between the glass plies.

3. The assembly is passed through nip rollers to remove air (pre‑lamination).

4. The sandwich is heated in an autoclave at approximately 120–140 °C and 10–12 bar pressure for a defined cycle, permanently bonding the PET interlayer to the glass.

5. After cooling, the finished PET laminated glass is inspected for optical quality and edge integrity.

PET interlayers can be used alone or in combination with PVB layers to tailor performance.

Key Advantages of PET Laminated Glass

Why Choose PET Laminated Glass?

1. Exceptional impact resistance and post‑breakage strength. PET film has much higher tear strength than PVB. Even after the glass plies crack, the PET interlayer continues to hold the fragments firmly, resisting puncture and maintaining a security barrier. This makes PET laminated glass ideal for areas prone to vandalism, forced entry attempts, or storm‑driven debris.

2. Superior weatherability. PET is highly resistant to moisture, salt fog, and UV radiation. Unlike some PVB interlayers that can delaminate at exposed edges over many years, PET maintains its bond and optical clarity even in harsh coastal or high‑humidity environments.

3. Enhanced acoustic insulation. The dense, stiff nature of PET film effectively dampens sound vibrations. PET laminated glass can achieve sound reduction values comparable to or better than acoustic‑grade PVB, making it an excellent choice for windows and partitions in noisy urban or airport‑adjacent buildings.

4. Lightweight yet strong. Because PET does not require the same thickness as multiple PVB layers to achieve high tear resistance, designers can achieve security ratings with thinner overall laminates, saving weight on large facade panels.

5. Excellent optical quality. PET film is crystal clear with very low haze. PET laminated glass provides undistorted views, making it suitable for display cases, showroom glazing, and high‑visibility architectural glass.

Applications of PET Laminated Glass

• Building windows in high‑crime or vandal‑prone areas – PET interlayer resists brick, hammer, and crowbar attacks.

• Glass railings and balustrades – maintains integrity even if glass is cracked, preventing dangerous edge exposure.

• Storefronts and retail glazing – combines security with excellent transparency.

• Acoustic windows near airports, highways, or railways – PET’s sound‑damping properties reduce noise ingress.

• Interior partitions in offices and public buildings – safety glazing with superior impact resistance.

• Museum display cases – UV‑stable, clear, and provides protection against accidental impact or attempted theft.

Part 2: Laminated Glass with Metal Mesh – Electromagnetic Shielding and Anti‑Riot Protection

For applications that require not only safety glazing but also electromagnetic compatibility (EMC) , anti‑static protection , or riot‑grade forced entry resistance , conventional laminated glass is insufficient. Laminated glass with metal mesh —embedding aluminum or copper mesh between glass plies—delivers these specialized capabilities while maintaining transparency and safety glass properties.

How Metal Mesh Laminated Glass Is Made

The production process begins with a fine metal mesh (woven wire cloth) made of aluminum or copper. The mesh specifications—wire diameter, opening size, and weave pattern—are selected based on the required shielding effectiveness, transparency, and mechanical strength.

The metal mesh is sandwiched between two or more glass sheets along with PVB, PET, or SGP interlayers. The entire assembly is then autoclaved, bonding the mesh and interlayers into a single, solid laminated panel. The mesh becomes permanently embedded inside the glass, protected from corrosion and mechanical damage.

Laminated Glass with Aluminum Mesh

Aluminum mesh is lightweight, corrosion‑resistant, and offers moderate electromagnetic shielding. It is the preferred choice for applications where weight is a concern and the required shielding frequencies are relatively low (typically below 1 GHz).

Key characteristics of aluminum mesh laminated glass:

• Good electromagnetic shielding effectiveness (SE) – typically 20–40 dB depending on mesh density, sufficient for many industrial and commercial EMC requirements.

• Lightweight – aluminum is about one‑third the density of copper, reducing overall glass weight.

• Excellent corrosion resistance – aluminum forms a protective oxide layer, making it suitable for exterior and high‑humidity environments.

• Moderate transparency – the mesh pattern is visible but does not severely obstruct vision; opening sizes of 3–6 mm maintain adequate visibility.

• Anti‑riot strength – the metal mesh acts as a reinforcement layer, significantly increasing resistance to repeated impacts from tools or blunt objects.

Applications of aluminum mesh laminated glass:

• Industrial control rooms and electrical substations – shielding against electromagnetic interference (EMI) from nearby equipment.

• Laboratories and testing facilities – creating EMI‑controlled environments for sensitive measurements.

• Building windows in high‑security or riot‑prone areas – the mesh reinforces the glass against repeated impacts from stones, bats, or other objects.

• Prison and detention facility glazing – anti‑riot security combined with visibility for supervision.

• Government and embassy buildings – additional forced‑entry resistance.

Laminated Glass with Copper Mesh

Copper mesh offers superior electrical conductivity and shielding performance, particularly at higher frequencies (up to several GHz). Copper is the material of choice when stringent electromagnetic shielding is required, such as in data centers, medical imaging rooms, or defense facilities.

Key characteristics of copper mesh laminated glass:

• High electromagnetic shielding effectiveness – typically 40–80 dB or higher, depending on mesh density and frequency. Copper can effectively block Wi‑Fi, cellular, radio, and radar frequencies.

• Excellent electrical conductivity – can be grounded to provide a continuous conductive plane, preventing static buildup and enabling controlled discharge.

• Anti‑static properties – dissipates static charge, protecting sensitive electronic equipment.

• Good transparency – similar to aluminum mesh; opening sizes can be optimized to balance shielding and visibility.

• Higher density – copper is denser than aluminum, resulting in heavier panels.

• Requires corrosion protection – copper can tarnish over time if the glass edge seal is compromised; high‑quality edge sealing is essential.

Applications of copper mesh laminated glass:

• Data centers and server rooms – prevents electromagnetic eavesdropping (TEMPEST protection) and reduces interference between equipment racks.

• Medical facilities (MRI, CT, PET scan rooms) – shields the external environment from the strong magnetic fields and RF emissions of imaging equipment, and protects sensitive electronics from external interference.

• Defense and government facilities – secure communication centers and SCIFs (Sensitive Compartmented Information Facilities) require copper‑mesh glazing to prevent signal leakage.

• Research laboratories (EMC testing chambers) – observation windows that maintain the electromagnetic integrity of the chamber.

• Industrial facilities with high‑power RF equipment – protects workers and nearby equipment from stray electromagnetic fields.

Aluminum Mesh vs. Copper Mesh: Selection Guide

Combining PET Interlayer with Metal Mesh

For the most demanding security and shielding requirements, manufacturers can produce special laminated glass that combines PET interlayers with aluminum or copper mesh in a single unit. The PET interlayer provides exceptional tear resistance and acoustic damping, while the metal mesh adds electromagnetic shielding and additional impact reinforcement.

These hybrid laminates are used in:

• High‑security government facilities requiring both forced‑entry resistance and signal shielding.

• Military command centers and embassies where blast, ballistic, and TEMPEST protection are required simultaneously.

• Critical infrastructure control rooms (power grids, transportation hubs) vulnerable to both physical attack and electronic eavesdropping.

Summary: Choosing the Right Special Laminated Glass

Conclusion

Special laminated glass extends the capabilities of conventional safety glazing into new performance domains. PET laminated glass offers lightweight, weather‑resistant, high‑tear‑strength laminates with excellent acoustic damping—ideal for security glazing in harsh environments. Laminated glass with aluminum or copper mesh transforms windows and partitions into electromagnetic shields and anti‑riot barriers, protecting both physical spaces and sensitive electronic equipment.

Whether your project requires a retail storefront that resists smash‑and‑grab attacks, an MRI suite that contains powerful magnetic fields, or a data center that blocks electronic eavesdropping, there is a special laminated glass solution engineered to meet your exact needs. Contact our technical team to discuss your shielding, security, and acoustic performance requirements.