Bullet Proof Film Series

In the field of EVA glass film production, there is a team called Foundite. They are committed to the pursuit of high-quality products and are writing their own stories with passion and dreams.

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At the beginning of the team's establishment, the EVA glass film products on the market were uneven, with large differences in quality and performance. Foundite is determined to change this situation and create EVA glass film with excellent quality. In order to achieve this goal, the team members ran around, deeply studied advanced technologies at home and abroad, and exchanged and discussed with industry experts. In the process of research and development, they encountered countless failures. The selection of raw materials, the adjustment of production processes, and the testing of product performance are all challenging. But the team members did not give up. With their tenacious perseverance and love for the product, they tried again and again and constantly summed up their experience and lessons.
In daily work, Foundite's team members work closely together. R&D personnel focus on technological innovation and continuously optimize product formulas and production processes; workers on the production line strictly control every production link to ensure stable and reliable product quality; sales staff actively expand the market, listen to customer needs, and promptly feedback to the R&D and production departments. Everyone thinks in one direction and works hard together for the team's goals.
I remember once, in order to meet the urgent order needs of an important customer, team members took the initiative to ask for overtime. R&D personnel repeatedly tested in the laboratory to ensure that product performance met customer requirements; production workers stayed at their posts and worked continuously for more than ten hours to ensure production progress; logistics personnel also fully cooperated and provided material and technical support. In the end, they delivered high-quality products on time and won high praise from customers.
After years of hard work, Foundite's products have gradually emerged in the market. With excellent quality and performance, their EVA film has been favored by many customers and their market share has continued to expand. But they are not satisfied with this, but continue to pay attention to industry trends, continue to invest in research and development, and launch more innovative products. In the future, this passionate and dreamy team will continue to deepen its roots in the field of EVA glass film and bring more high-quality products and services to customers.

With the booming solar photovoltaic industry, the importance of photovoltaic film, a key encapsulation material for photovoltaic modules, is undeniable. It not only protects solar cells and extends module life, but also plays a key role in improving module power generation efficiency. Today, let's take a deeper look at photovoltaic film and its various types.

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1. What is Photovoltaic Film?


Photovoltaic film is a thin film material used for photovoltaic module encapsulation, primarily for module-level encapsulation of solar panels. It is positioned between the cell and the photovoltaic glass and backsheet, providing bonding, protection, light transmission, and insulation. The performance of photovoltaic film directly impacts the module's power generation efficiency, weather resistance, and service life. It is one of the core materials affecting photovoltaic module quality, accounting for 3%-4% of the module cost.


2. Types of Photovoltaic Film


EVA Film


EVA film is primarily composed of a copolymer of ethylene and vinyl acetate, with additives such as crosslinkers, thickeners, antioxidants, and light stabilizers. It exhibits excellent flexibility, impact resistance, elasticity, optical transparency, low-temperature flexural strength, adhesion, environmental stress cracking resistance, weather resistance, corrosion resistance, heat sealing, and electrical properties. EVA film can be further categorized into four types: high-transmittance, high-cutoff, white, and black. Single-glass modules typically utilize a combination of high-transmittance EVA and white EVA for encapsulation. This increases both light transmittance from the front and light reflectivity from the inner layers, thereby improving the module's photovoltaic conversion efficiency. Black single-glass modules typically utilize a combination of high-transmittance EVA, high-cutoff EVA, and a black backsheet, or high-transmittance EVA, black EVA, and a white backsheet for encapsulation. The high-cutoff EVA blocks UV rays from sunlight, reducing damage to the inner backsheet. Currently, transparent EVA film remains the most widely used film in the market, accounting for approximately 42.5% of the market share.


POE Film


POE film is made from POE resin with the addition of appropriate processing aids. POE is a random copolymer elastomer formed by the polymerization of ethylene and 1-octene. It features a low melting point, a narrow molecular weight distribution, and long chain branches. In the ethylene-octene copolymer system, octene units can be randomly attached to the ethylene backbone, resulting in excellent mechanical properties and light transmittance. POE film offers excellent water vapor barrier properties, with a water vapor transmission rate approximately one-eighth that of EVA. Its stable molecular chain structure and slow aging make it ideal for protecting solar cells from water vapor corrosion in high-temperature and high-humidity environments, enhancing the resistance of solar panels to potential-induced degradation (PID). It also exhibits excellent weather resistance, lacking hydrolyzable ester bonds in its molecular chain, which prevents the generation of acidic substances during aging. POE film is primarily used in double-glass N-type photovoltaic modules.


EPE film


EPE film is a multi-layer co-extruded EVA/POE/EVA film formed by co-extrusion of EVA and POE. POE film is prone to additive precipitation during lamination, resulting in film slippage during use and affecting product yield. EPE film addresses this issue. It combines the advantages of both EVA and POE, offering the water barrier and PID resistance of POE with the high adhesion of EVA. With the development of double-glass modules and N-type cells, the market share of EPE film has gradually increased, reaching 27.8% in 2023.


Other Films


In addition to the three common films mentioned above, there are also films used in specific scenarios. For example, PVB film (polyvinyl butyral) has gained a foothold in BIPV (building-integrated photovoltaic) modules due to its cross-linking resistance and recyclability. However, its light transmittance (89-90%) is lower than that of POE, and its water vapor barrier properties are poor, limiting its application range. Perovskite modules, due to their high sensitivity to moisture and oxygen, use TPO film or POE film as encapsulation materials. Furthermore, silicone film has seen an increase in market share in high-temperature regions, and butyl film is also being explored for heterojunction encapsulation.


Different types of photovoltaic films vary in performance, cost, and application scenarios. With the continuous development of the photovoltaic industry, the performance requirements for photovoltaic films are becoming increasingly stringent. Film companies are constantly innovating to develop products that better meet market demands.


As a professional EVA membrane manufacturer, Shengding (trademark name) has always been committed to the development and research of this industry. If you have any related questions, you are welcome to give us your suggestions!

When you're shopping for protective films or flexible materials for your e-commerce products—whether it's phone cases, apparel accessories, or packaging solutions—you'll quickly run into two confusingly similar options: TPU film and PU film. They sound almost identical, and honestly, even seasoned buyers sometimes mix them up.



But here's the thing: choosing the wrong one can mean product failures, returns, or simply overpaying for features you don't actually need. The differences between these two materials aren't just technical jargon—they directly affect how your product performs, how long it lasts, and whether your customers will be happy with their purchase.



This guide breaks down the real-world differences between TPU and PU films in plain language, so you can make a confident choice without needing a chemistry degree.







What Makes TPU and PU Films Different?
The Core Difference: How They React to Heat
TPU (Thermoplastic Polyurethane) is what we call a thermoplastic material. In simple terms, when you heat it up, it gets soft and moldable. When it cools down, it hardens again. You can repeat this process multiple times without ruining the material.



Traditional PU film, on the other hand, is usually thermoset. Once it's been manufactured and cured, heating it won't make it soft again—the chemical structure is permanently set. Think of it like baking a cake versus melting chocolate. One you can remelt, the other you can't.



Why This Matters for Your Products
This isn't just a chemistry fun fact. The thermoplastic nature of TPU means:

• You can heat-seal or weld TPU films together—great for creating sealed edges or attaching layers • Scrap material can potentially be recycled or reprocessed, which might matter if you care about sustainability • TPU handles temperature changes during shipping and storage better • It's generally easier to work with if you're doing any custom fabrication



If you're sourcing films for products that need heat bonding, welding, or might be exposed to varying temperatures during use, TPU usually gives you more flexibility.

How Each Film Is Made—And What That Means for You
TPU films are typically made through extrusion or calendaring processes. Picture continuous sheets being rolled out, with consistent thickness and properties. This manufacturing method usually means:

• More consistent quality from batch to batch • Easier to get custom thicknesses • Generally more cost-effective for larger orders • Faster production turnaround



PU films often go through solution casting or coating processes, sometimes requiring chemical curing time. This can result in:

• Longer lead times, especially for custom specifications • Potential variation between production batches • Sometimes higher minimum order quantities



If you're running a fast-moving e-commerce operation where you need reliable reorder cycles and consistent product quality, the production method matters more than you might think.

Real-World Performance: Where Each Material Shines
Durability and Flexibility
TPU films typically offer excellent abrasion resistance and can stretch significantly without tearing. If your product gets handled roughly, dropped, or repeatedly flexed—like phone screen protectors, watch straps, or bag components—TPU's toughness usually wins out.



PU films can be softer and sometimes offer a more premium tactile feel, which might matter for fashion accessories or decorative applications. However, they generally won't hold up as well to repeated mechanical stress.



Chemical and Weather Resistance
TPU handles oils, greases, and many common chemicals better than standard PU films. It also tends to resist UV degradation more effectively, meaning less yellowing or brittleness over time if your products are exposed to sunlight.



For e-commerce sellers shipping globally—where products might sit in hot warehouses or get exposed to various conditions—TPU's stability can reduce customer complaints about premature aging.



Temperature Range
TPU maintains its flexibility across a wider temperature range, staying pliable even in cold conditions where some PU films might stiffen or crack. If your products will be used outdoors or in varying climates, this becomes a practical advantage.

Which Should You Choose?
Go with TPU film if:

• Your product needs strong abrasion or tear resistance • You'll be using heat sealing or welding in manufacturing • Consistency across large production runs matters • Products will face temperature variations or outdoor use • You want easier reprocessing or recycling options

Consider PU film if:

• You need a specific soft-touch aesthetic • The application is primarily decorative or low-stress • You're working with specialized coatings that require PU • Budget is extremely tight for very small quantities

For most e-commerce applications—protective covers, durable accessories, functional components—TPU offers better overall value and reliability.

Getting Quality TPU Film That Actually Performs
Here's where theory meets reality: not all TPU films are created equal, even if they're technically the same material. Manufacturing precision, quality control, and proper material selection make a huge difference in whether your products succeed or fail in the market.



At Shengding, we specialize in producing consistent, high-performance TPU films specifically for commercial applications. Whether you need specific thicknesses, custom widths, or help determining the right specification for your product, our team can guide you through the selection process based on your actual use case—not just sell you material.



We understand that for e-commerce sellers, reliability isn't optional. Returns are expensive, and reputation matters. That's why our TPU films go through rigorous quality checks before shipping, and we maintain stock levels that support your reorder needs without long waits.



If you're currently using PU film and wondering whether switching to TPU makes sense—or if you're launching a new product and want to get the material choice right from the start—reach out to our team at https://www.tpufilmmanufacturers.com. We're happy to provide samples and technical guidance based on your specific requirements.



Common Questions About TPU vs PU Films
Can TPU and PU films be used interchangeably?
Not usually. While they might look similar, their different behaviors during processing and use mean you'll likely need to adjust your manufacturing process or product design when switching between them.



Is TPU film more expensive than PU film?
Per kilogram, TPU can be slightly higher, but the total cost often works out better when you factor in lower waste rates, easier processing, and fewer quality issues. The longer durability also means fewer customer returns.



How do I know if the TPU film I'm getting is good quality?
Look for consistent thickness measurements, clear technical data sheets, and suppliers who can provide performance testing documentation. At Shengding, we provide full specifications and can arrange sample testing so you can verify performance before committing to larger orders.



Does TPU film work for food packaging applications?
Some TPU formulations are food-safe, but you need to specifically request and verify certifications. Always confirm with your supplier that the material meets relevant food contact regulations for your target markets.

Shengding High-Tech Materials is a high-tech enterprise in China with independent R&D capabilities across the entire TPU industry chain. It specializes in two main types of laminated glass films—EVA and TPU—which are suitable for diverse applications including residential decoration, high-end security, and aerospace and defense. The products have passed multiple international environmental and system certifications, successfully replacing imported high-end materials.

EVA films are characterized by high light transmittance, ease of processing, and cost-effectiveness. They are available in three main series: high-temperature ultra-transparent, low-temperature photovoltaic, and colored decorative. These films offer excellent light transmittance, a simple hot-press lamination process, and are suitable for a processing temperature range of 90–130°C. The products offer stable adhesion and resistance to yellowing, and are widely used in artistic decorative glass, architectural doors and windows, photovoltaic modules, and smart dimmable glass. The colored variants can be customized with specific colors and textures to meet personalized decorative needs for landscape railings, interior partitions, and other applications, making them suitable for small- to medium-volume glass processing projects.

Optical-grade TPU film is the company’s core high-end product. The company independently masters raw material synthesis and film formation technologies and led the development of the national standard for aviation polyurethane films. The product features outstanding impact resistance, bulletproof, and blast-resistant properties; it remains flexible even at -60°C, offers strong adhesion, and can be laminated to inorganic glass and PC organic sheets to effectively absorb impacts and prevent shatter. TPU films across all grades are used in applications such as aircraft windows, bulletproof glass for armored vehicles, high-speed rail windows, bank security glass, and high-end curtain walls. They offer weather resistance, oxidation resistance, and puncture resistance, making them suitable for demanding environments in the military, rail transit, and high-end construction sectors. Relying on a CNAS-accredited laboratory, the company conducts full-process performance testing and supports customization of specifications and hardness upon request, with products exported to markets both domestically and internationally.

The TPU film independently developed and manufactured by Shengding Advanced Materials is a high-performance thermoplastic polyurethane elastomer film. The company holds independent intellectual property rights across the entire production chain—from the synthesis of raw material pellets to extrusion film production—breaking the foreign monopoly on high-end material technology and achieving import substitution for key materials. The product has passed multiple ISO system certifications and complies with the EU’s REACH and RoHS environmental standards, ensuring reliable quality and safety.

This film offers outstanding overall performance, with optical transmittance reaching 90% and a clear, shadow-free light transmission. It features exceptional low-temperature resistance, with a glass transition temperature as low as -68°C, and maintains stable performance even at -60°C. Additionally, it exhibits excellent adhesion, bonding tightly to materials such as PC and acrylic, ensuring a secure bond while providing superior bulletproof, blast-resistant, and impact-resistant protection.

The product line comprises a diverse range of categories compliant with national standards, suitable for a wide variety of applications. It is widely used in high-end equipment sectors such as aerospace, high-speed trains, and naval armor, as well as in civilian applications including high-end architectural safety glass, bank counters, and medical protective glass. Thanks to its consistent quality, it has become the preferred choice for high-end protective laminated materials.