The application of TPU (Thermoplastic Polyurethane) in laminated glass products lies in its exceptional overall performance as an interlayer material. By achieving an outstanding balance between safety, optical properties, and durability, TPU has become an ideal choice for many high-end and specialty glass applications.
Core Advantages of TPU Interlayers
- Superior Mechanical Properties: TPU has a tensile strength 5–10 times that of traditional PVB (polyvinyl butyral) and an elongation at break of 500%–800%. This allows it to absorb impact energy through significant deformation, effectively preventing penetration – making it ideal for high-security applications such as bulletproof, blast-resistant, and storm-resistant glass.
- Excellent Low-Temperature Flexibility: TPU remains elastic even at -65°C without becoming hard or brittle. This property makes it particularly suitable for windows, curtain walls, and other applications in high-latitude cold regions.
- Broad Substrate Adhesion: TPU exhibits excellent adhesion to a wide range of materials including glass, polycarbonate (PC), and acrylic (PMMA), enabling the design of lightweight composite structures (e.g., glass-TPU-PC) or the manufacture of complex curved shapes.
- Outstanding Optical Properties: Optical-grade TPU interlayers can achieve light transmittance of over 90%, with haze as low as below 1% and a neutral color tone – making them ideal for applications requiring high clarity such as decorative glass and high-end skylights.
- Long-Term Environmental Stability: TPU contains no plasticizers, so it does not suffer from performance degradation due to plasticizer migration. It also offers excellent UV resistance and hydrolysis resistance, effectively resisting yellowing and aging, with a long service life.
- Excellent Processability and Environmental Friendliness: As a thermoplastic material, TPU has relaxed storage requirements and does not require refrigeration. It is compatible with mainstream composite processes such as autoclave and vacuum bag methods, supports secondary thermal fusion and trim recycling, and tends to form fewer bubbles when laminating curved glass surfaces.
Key Selection Parameters
| Parameter Category | Key Indicator | Typical Value / Requirement | Significance & Selection Guidance |
|---|---|---|---|
| Optical Properties | Light Transmittance | ≥ 90% | Higher values indicate clearer, more transparent glass. |
| Haze | ≤ 1% | Lower values mean clearer vision and less visual blurring. | |
| Mechanical Properties | Tensile Strength | > 30 MPa | Higher values mean better impact and puncture resistance. |
| Elongation at Break | 400% – 800% | Higher values mean better material toughness and energy absorption. | |
| Tear Strength | Typically > 50 kN/m | Measures resistance to tear propagation, preventing glass fragment separation. | |
| Hardness (Shore A) | Approx. 75 | Affects film flexibility and scratch resistance. | |
| Environmental Durability | Glass Transition Temperature (Tg) | Approx. -68°C | Lower Tg means better low-temperature toughness. |
| Yellowing Resistance | Low ΔYI change | Selecting aliphatic TPU is key to ensuring long-term outdoor anti-yellowing performance. |
Typical Application Scenarios
- Building & Architecture: Windows and curtain walls in extremely cold regions; curved/shaped laminated glass; high-end decorative glass, interior partitions, and railings; security applications such as bank counter glass.
- Transportation: Cabin glass and windows for automobiles, rail transit, and aircraft.
- Specialty Protection: Bulletproof, blast-resistant, and impact-resistant glass, as well as photovoltaic modules and specialty industrial composite glass.
Selection Summary
Choosing TPU interlayers essentially means selecting a ”high-performance safety and long-term durability” solution for your project. It is best suited for projects with high standards for safety protection, low-temperature toughness, design flexibility, and long-term stability. When making your selection, base your decision on specific project requirements, focusing on core parameters such as tensile strength, elongation at break, light transmittance, haze, and yellowing resistance.
It is worth noting that aliphatic TPU is typically the preferred choice for high-end applications due to its superior UV resistance and anti-yellowing properties. Additionally, customizable functional properties such as film thickness, hardness, and adhesion strength support large-scale customized production for glass processors worldwide.
In Summary
TPU interlayers, with their excellent elasticity, toughness, optical clarity, and long-term reliability, are becoming a key material driving innovation and upgrading in laminated glass applications across the safety, building, and transportation industries. For details, please contact with LingHua.
Post time: Aug-14-2026