Foundite's Tpu Membrane

In today's complex social environment and the wave of rapid technological development, safety protection has become the focus of attention in many fields. Bulletproof glass film, as an important innovative material in the field of safety protection, is relying on its excellent performance and high customization flexibility, starting from vehicle safety protection and gradually expanding to a wider range of applications.

Although civilian cars rarely encounter extreme dangers in daily life, accidents such as traffic accidents and malicious collisions occur from time to time. Bulletproof glass TPU interlayer can greatly enhance the impact resistance of automotive glass. During a collision, ordinary glass is prone to shattering and splashing instantly, causing secondary damage; while glass with TPU interlayer, even if it is strongly impacted, the fragments will be adhered to avoid hurting people, gaining buffer time for drivers and passengers, reducing the risk of casualties, and adding a sense of security to daily travel.

Automotive bulletproof glass is the core protective component of high-end safety vehicles, and its performance directly affects the safety of passengers. Traditional bulletproof glass usually adopts a laminated structure of multi-layer glass and PVB (polyvinyl butyral), but with the advancement of material technology, thermoplastic polyurethane (TPU) interlayer film is gradually becoming a better choice.



TPU film is changing the design standards of bulletproof glass with its excellent impact resistance, weather resistance, lightweight and optical properties. This article will deeply explore the application advantages of TPU interlayer film in automotive bulletproof glass, and compare the performance differences of traditional PVB materials to help users understand why TPU is becoming the preferred material for high-end protective glass.



TPU (Thermoplastic Polyurethane) is a high-performance elastomeric material with excellent mechanical strength, flexibility and chemical resistance. In bulletproof glass, TPU film is used as an adhesive material between glass layers. Its main functions include: absorbing impact energy and preventing glass from shattering and splashing. Enhance structural integrity, even if the glass is broken, it can still maintain a certain degree of protection. Improve optical clarity and reduce glare and haze.

Compared with traditional PVB film, TPU performs better under extreme conditions, making it an ideal choice for bulletproof and explosion-proof glass.



TPU interlayer film has higher impact resistance, and the elongation at break of TPU film can reach 500%-800%, which is much higher than the 200%-300% of PVB film. This means that under the impact of bullets or explosions, TPU can absorb more energy and reduce the risk of glass penetration.



Test data comparison (taking NIJ standard level III bulletproof test as an example)





Material
Bullet interception effect
Back plate recess depth




PVB interlayer
Interceptable, but easy to delaminate

25-30mm




TPU interlayer
Effective interception, no stratification

15-20mm






The molecular structure of TPU film enables it to maintain adhesion under high-speed impact, while PVB may delaminate under high-energy impact, reducing the protective effect.



TPU has stronger weather resistance and stability. Traditional PVB film may soften or embrittle under high temperature (>60°C) or low temperature (<-20°C) environment, while TPU has a wider temperature resistance range (-40°C to +90°C) and is suitable for extreme climates.

The comparison of the adaptability of the two environments also shows that PVB film is prone to yellowing after long-term exposure to the sun and may produce bubbles under high temperature. TPU film is resistant to UV aging and maintains high transparency after long-term use.



Due to the higher impact resistance of TPU, bulletproof glass can use thinner glass layers to reduce weight. For example: PVB bulletproof glass (NIJ Level Ⅲ): usually requires a total thickness of 30-40mm. TPU bulletproof glass (same protection): can be reduced to 25-30mm, reducing weight by 15%-20%.



This is critical to the fuel economy and handling of high-end bulletproof vehicles (such as presidential cars and armored money transporters).



The light transmittance of TPU film can reach 92% (PVB is usually 88%-90%), and the haze is lower (<0.5%), making the visual experience of bulletproof glass closer to that of ordinary automotive glass, avoiding the "fish tank effect".



The explosion-proof properties of TPU film make it an ideal choice for money transporters. Even if it encounters shooting or explosions, the glass can still maintain its integrity, buying time for the occupants to evacuate.

With its excellent impact resistance, weather resistance, lightweight and optical properties, TPU interlayer film is gradually replacing PVB as the preferred material for high-end bulletproof glass. Whether it is military armored vehicles, dignitaries' cars, or civilian bulletproof models, TPU can provide more reliable security protection while taking into account beauty and comfort.



With the advancement of material technology, TPU will be more widely used in the bulletproof field and become the "invisible guardian" of automotive safety glass.

In the process of modern agricultural development, agricultural greenhouses, as important facilities to ensure the stable growth of crops, have increasingly stringent requirements on the performance of protective materials. Materials with good light transmittance can provide sufficient light for crops, while materials with strong impact resistance can resist natural disasters and protect the safety of crops. As a new type of protective material, TPU film is gradually becoming a new favorite in agricultural greenhouse construction with its excellent balance between light transmittance and impact resistance. ​
From the essence of the material, TPU (thermoplastic polyurethane elastomer) has a unique molecular structure, which is the key to its ability to balance light transmittance and impact resistance. The TPU molecular chain segments are arranged regularly and have few internal impurities, so that light can be transmitted more smoothly when passing through the TPU film, reducing the scattering and absorption of light, thereby ensuring a higher light transmittance. Generally speaking, the light transmittance of high-quality TPU film can reach more than 90%, which is almost close to the light transmittance of glass, and can fully meet the light needs of crops, so that crops can also enjoy sufficient sunlight in the greenhouse and carry out efficient photosynthesis.


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In terms of impact resistance, the molecular chain segments of TPU film have good flexibility and elasticity. When impacted by external force, TPU film can absorb impact energy through stretching, twisting and recovery of molecular chains, disperse the impact force to a larger area, and avoid local stress concentration leading to material rupture. In practical applications, TPU film can easily resist the impact of hail, gravel caused by strong winds, etc., and even in the face of large hail, it can effectively buffer its impact and protect the crops in the greenhouse from damage. For example, in some areas where hail disasters are frequent, the internal crop damage rate of agricultural greenhouses using TPU film is significantly lower than that of greenhouses using traditional plastic film. ​
In order to further optimize the balance between light transmittance and impact resistance of TPU film, scientific researchers and production enterprises continue to innovate technology. On the one hand, by improving the production process, such as using advanced cast film production, the thickness of TPU film is made more uniform, internal defects are reduced, and thus light transmittance is improved; on the other hand, special additives and additives are added to the formula of TPU film to enhance the intermolecular force without affecting light transmittance, and further improve impact resistance. At the same time, the TPU film can also be surface treated, such as coating with a scratch-resistant coating, which can enhance the wear resistance of the film surface without affecting its light transmittance, so that the TPU film can always maintain good performance during long-term use. ​
The application of TPU film in agricultural greenhouses not only provides a good environment for the growth of crops, but also has environmental advantages. TPU film is a recyclable material. After being discarded, it can be professionally recycled to reduce pollution to the environment, which is in line with the concept of sustainable agricultural development. With the continuous advancement of technology and the gradual reduction of costs, TPU film is expected to be more widely used in the field of agricultural greenhouses, injecting new impetus into the high-quality development of modern agriculture, and becoming an important aid in ensuring crop safety, increasing yield and quality in agricultural production.

When choosing a flexible polymer film for your product (whether for protective covers, textile applications, automotive interiors, or medical devices), you may face a common question: Should I choose a TPU film or a PU film?



At first glance, the two names seem similar. But they are actually quite different. The choice between thermoplastic polyurethane (TPU) film and traditional polyurethane (PU) film involves fundamental differences in manufacturing processes, performance, and long-term costs. If you are new to material selection, these differences are easy to overlook—but their importance may be greater than you think.



This article will analyze in detail the key differences that influence product decisions, focusing on which methods are effective in actual production and use.







How TPU and PU films are made—and why it matters.
The biggest difference between these materials lies not in the appearance of the finished product, but in their production methods.



**TPU film can be melt-processed.** You can heat it, shape it, cool it, and then heat it again without chemical decomposition. This means manufacturers can use processes such as extrusion, calendering, and thermoforming—methods that support high-volume production, tight thickness control, and secondary processing such as welding or embossing.



On the other hand, PU films are typically made using reaction casting or coating methods. The liquid prepolymer forms a cross-linked network after curing. Once cured, it cannot be remelted. This limits the processing options for the molded material, but also allows it to exhibit a soft texture and surface finish that TPU typically cannot match.



This is more than just a technical footnote. It impacts every aspect of downstream processes: how to create prototypes, how to scale up production, how to handle waste, and whether the film can be seamlessly integrated into your existing manufacturing processes.

For companies that work with contract manufacturers or implement lean operations, understanding these manufacturing differences early on can save significant time and costs during product development.

Performance characteristics that influence material selection
Besides the manufacturing process, TPU and PU films also differ in performance, which directly affects the product's performance.



• Temperature resistance: TPU films generally maintain their shape and mechanical properties over a wide temperature range, especially at low temperatures. PU films may harden or crack at low temperatures, depending on their formulation.



• Abrasion and tear resistance: TPU performs excellently in high-abrasion applications, such as protective films, footwear components, and inflatable structures. While PU films are flexible, they typically lack the same toughness under repeated stress.



• Breathability and Moisture Wicking:Some polyurethane formulations can achieve high water vapor transmission rate (MVTR) and extremely low air permeability—characteristics highly valued in technical textiles. Thermoplastic polyurethane (TPU) can also achieve this, but typically requires special grades.



• Surface finish and feel: PU films typically have a softer feel, closer to leather or textiles. This is crucial in areas such as apparel, automotive interiors, and consumer goods, as feel influences brand perception.



If your product will be exposed to outdoor environments, frequent use, or heat cycling, TPU is generally a safer choice. However, if aesthetics, drape, and softness are primary considerations—especially in the fashion or interior design sectors—PU may be more suitable.



When is TPU film suitable for your product?
When durability and processing flexibility cannot be ignored, TPU film is the ideal choice.



If you're developing products that need to withstand UV exposure, frequent use, or mechanical stress—such as phone screen protectors, outdoor gear, or automotive paint protection films—TPU's toughness becomes a key advantage. It better maintains its performance, is less prone to yellowing, and in many cases, can be recycled or reprocessed.



TPU is also a good choice when you need precise tolerances or plan to integrate films into automated production lines. Its melt-processing properties mean you can thermoform, RF weld, or laminate it with other thermoplastics without worrying about compatibility issues.



For e-commerce businesses sourcing protective films or functional components, partnering with a reliable TPU film supplier like Shengding ensures consistent material quality and customized specifications. Shengding offers a range of TPU films with varying hardness, thickness, and surface finishes to help you precisely match material properties to your product's specific needs, avoiding over-design or cost overruns.



When to choose PU film
When aesthetics, comfort, and specific functional characteristics are the primary considerations, PU films can stand out.



In the fashion, interior design, and soft furnishings industries, tactile experience is paramount. PU films can mimic the look and feel of natural leather or suede while remaining lightweight and affordable. They drape better, adhere more strongly to fabrics, and allow for fine printing or embossing.



Some PU films are specially designed to be both breathable and waterproof, making them popular in sportswear, medical textiles, and shoe linings.

However, it's important to note that PU film is more difficult to recycle, has poor resistance to extreme temperatures, and offers limited room for post-processing and modification. If your product requires rework, repair, or integration with thermoplastic components, PU film may become a bottleneck.



Cost considerations besides the price per kilogram
While directly comparing material costs is tempting, total cost of ownership provides a more comprehensive picture of the actual situation.



While TPU film has a higher initial material cost, its high processing efficiency, recyclability, and durability reduce waste, mold costs, and warranty claims. These advantages accumulate rapidly if you are scaling up production or planning to extend product lifespan.



Polyurethane films may have a lower unit area price, but limitations in processing and rework can increase labor costs or scrap rates. If your production involves frequent design iterations or complex assembly, these hidden costs may offset the initial savings.



For buyers new to the market, requesting sample rolls and conducting small-batch trial production before placing large orders is worthwhile. Shengding provides sample support and technical consultation to help e-commerce companies test material performance in real-world application environments before scaling up production.



Choose the right materials for your product
Choosing between TPU and PU film is not about selecting the "better" material, but about finding the material that best suits your specific product requirements, production setup, and market positioning.



Ask yourself:



• Will the product face high-intensity use, outdoor exposure, or extreme temperature environments?


• Do you require strict dimensional control, or do you plan to integrate the film into thermoplastic components?


• Are soft-touch materials or aesthetically pleasing surface finishes key selling points?


• How important is recyclability or sustainability to your brand positioning?



Your answer will guide you to find the most meaningful material—not only from a technical perspective, but also from a business perspective.



If you still have concerns, partnering with an experienced supplier can streamline the process. Shengding collaborates with global e-commerce brands to source, customize, and deliver TPU films that meet product goals and budget constraints, offering transparent, flexible, and reliable delivery times.



Frequently Asked Questions (FAQ)
1.Can TPU film and PU film be used interchangeably?

Generally not. Although they look similar, their processing techniques and performance characteristics are completely different. Randomly substituting them without testing may lead to problems in manufacturing or product durability.



2.Which material is more environmentally friendly?

TPU film is typically a thermoplastic material, making it easier to recycle. PU film is a thermosetting material, making it more difficult to reprocess. However, some PU formulations reduce VOC (volatile organic compound) emissions during the production process.



3.Are TPU films more expensive than PU films?

TPU films are generally more expensive per kilogram, but considering processing efficiency, reduced waste, and product lifespan, the total cost can be competitive or even lower, depending on your application.



4.Where can I source high-quality TPU film for e-commerce products?

Shengding specializes in manufacturing TPU film for the global market, offering a variety of customization options including thickness, surface treatment, and hardness. They support both small-batch orders and large-scale production, making them an ideal partner for e-commerce businesses at all stages of development. Visit tpufilmmanufacturers.com for more product information and to request samples.

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.