High Quality Tpu Film Interlayer

#unit-ULBFEr4AZFw1UOZ{padding-bottom:1vw;}@media(max-width:1199px){#unit-ULBFEr4AZFw1UOZ{padding-bottom:2vw;}}@media(max-width:767px){#unit-ULBFEr4AZFw1UOZ{padding-bottom:4vw;}}

In the past few days at the Ningbo CAEE Aviation Manufacturing Equipment Expo, Sheng ding（Foundite） High-tech New Material Co., Ltd. featured TPU intermediate film as its main product, drawing the attention of numerous visitors. During the expo, Sheng ding（Foundite） engaged in in-depth cooperative discussions with multiple clients. The company's TPU intermediate films were highly recognized for their weather resistance, abrasion resistance, and high strength. Throughout the cooperation process, Sheng ding（Foundite）'s professional team and quality services won unanimous praise from clients.


The clients at the expo expressed that the products and technical strength displayed by Sheng ding（Foundite） were impressive. They are full of expectations for the company's future development and hope to further strengthen cooperation in the future. The expo not only showcased Sheng ding's product capabilities, but also enhanced its brand image, injecting new momentum into the development of the aviation manufacturing field.

#unit-OFqnxMSpE4ILCQG .ce-image_inner{justify-content:center;}#unit-OFqnxMSpE4ILCQG .ce-image_item{--svg-color:rgba(0, 105, 213,1);}#unit-OFqnxMSpE4ILCQG .ce-image{height:100%;width:100%;--image-effect:2;}

At the 2024 International Glass Industry Technology Exhibition, the technical team of a foreign architectural glass manufacturer discovered the Foundite EVA interlayer product at the Foundite booth. The customer was looking for a high-performance, high-transparency laminated glass material for its high-end building curtain wall and photovoltaic glass projects.
The Transparent EVA Film exhibited by Foundite aroused great interest from the customer team. The product uses imported raw materials and has the characteristics of high transparency, strong adhesion, low overflow, etc., which is particularly suitable for architectural glass, photovoltaic modules and decorative glass applications. The customer's technical director said: "We tested the samples of Foundite EVA interlayer at the exhibition, and its optical properties and weather resistance far exceeded the industry standards, which fully met our requirements for high-end architectural glass."



In-depth technical exchanges: verify product performance
After the exhibition, the customer immediately had in-depth communication with Foundite's technical team, focusing on the following properties of EVA interlayer: Optical properties: light transmittance, controllable UV transmittance, haze, etc. to ensure the high clarity of the glass. Physical properties: strong peeling, tensile strength, etc. to ensure the long-term stability of the glass. Weather resistance: high temperature and high humidity test, no bubbles, no debonding, etc., suitable for long-term outdoor use. Processing adaptability: suitable for different glass lamination processes.
Foundite provided a complete test report and industry certification, and arranged for the customer team to visit its modern production line in Shandong to ensure that product quality is controllable and supply is stable.



Sample test: performance exceeds expectations
The customer conducted rigorous laboratory tests on Foundite EVA interlayer, including:
Optical performance test: verify whether the transmittance and haze meet the high standards of architectural glass.
Weather resistance test: simulate long-term stability under extreme climatic conditions (high temperature, high humidity, ultraviolet radiation).
Adhesion strength test: ensure that the glass will not delaminate or debond when impacted.
Processing performance test: verify the lamination effect at different temperatures to ensure production efficiency.
The test results satisfied the customer: "Foundite EVA interlayer performed well in various tests, especially its high temperature and high humidity resistance far exceeded that of competing products, which fully met the needs of our high-end building projects in the Middle East and Southeast Asia."



Cooperation negotiation: customized solution
Based on the test results, the customer and Foundite entered into formal cooperation negotiations, and the two parties reached the following key agreements:
Customized formula optimization: For the customer's photovoltaic glass project, adjust the EVA cross-linking degree to improve UV resistance.
Stable supply guarantee: Foundite promises to give priority to supply and establish a safety inventory mechanism to ensure that the project progress is not affected.
Long-term price lock: Sign a 3-year framework agreement to ensure cost control.



Sign a long-term strategic cooperation agreement
At the end of 2024, the customer and Foundite officially signed a 5-year strategic cooperation agreement. The customer's purchasing director said: "Foundite EVA interlayer not only has excellent performance, but also its stable supply and rapid technical response capabilities make us very relieved. This cooperation will help us improve the market competitiveness of high-end architectural glass."
Foundite EVA interlayer has successfully helped customers take a leading position in the construction market with its excellent optical properties, stable weather resistance and strong adhesion. This cooperation not only reflects Foundite's technical strength and supply chain guarantee capabilities, but also demonstrates Foundite's position in the field of high-end laminated glass materials.
In the future, Foundite will continue to work with global partners to promote innovation and development in the architectural glass industry.

With the rapid development of rail transit today, safety is always the top priority. In order to improve the level of window protection, TPU bulletproof film came into being. While ensuring safety, its weather resistance advantage brings a new upgrade experience to rail transit window protection. ​
TPU, a material, is widely used in many fields due to its excellent physical properties and chemical stability. The bulletproof film made of it not only has high strength, penetration resistance and good toughness.


#unit-d0MPQVlgkSjyR5Z .ce-image_inner{justify-content:center;}#unit-d0MPQVlgkSjyR5Z .ce-image_item{--svg-color:rgba(0, 105, 213,1);}#unit-d0MPQVlgkSjyR5Z .ce-image{--image-effect:1;}









#unit-2uWHd2A7WSg33c6 .ce-image_inner{justify-content:center;}#unit-2uWHd2A7WSg33c6 .ce-image_item{--svg-color:rgba(0, 105, 213,1);}#unit-2uWHd2A7WSg33c6 .ce-image{--image-effect:1;}











The operating environment of rail transit is complex, and the windows are subjected to environmental factors such as ultraviolet rays, temperature changes, humidity, and oxidation all year round. TPU bulletproof film has good ultraviolet resistance and can effectively prevent degradation caused by ultraviolet rays. After long-term exposure to sunlight, its physical properties remain stable, and it is not easy to become brittle or discolored, which can ensure the transparency of the windows and protect the passengers' vision. ​
Whether it is a cold winter or a hot summer, TPU bulletproof film can handle it calmly. It has a wide operating temperature range and can still maintain good performance under extreme temperature conditions. It can also maintain its functionality in an environment with alternating hot and cold, and will not fluctuate in performance due to temperature changes, greatly extending the service life of the windows. ​
In terms of humidity, TPU bulletproof film has low hydrophilicity and can effectively resist the penetration and influence of moisture. Even in a high humidity environment, it can maintain good mechanical properties and structural stability to avoid problems such as mold and corrosion caused by humidity. This is especially important for some rail transit vehicles that often operate in humid areas.​
In addition, when exposed to oxygen in the air, TPU bulletproof film exhibits high oxidation stability and is not easily affected by oxidation reactions, further ensuring its long-term performance in various environments. ​
TPU bulletproof film has significant weather resistance advantages, providing reliable protection for rail transit window protection. With the continuous advancement of technology, TPU bulletproof film is expected to play a greater role in the field of rail transit and escort passengers' safe travel.

EVA film (ethylene-vinyl acetate copolymer) is a thermoplastic encapsulation layer that bonds the glass, solar cells, and backsheet in a photovoltaic module together through thermally activated crosslinking. It is more than just an adhesive; it is a protective barrier that determines whether a solar panel's lifespan is 25 years or only 5 years before it begins to fail.



Understanding the role of EVA films and when their performance truly matters can help anyone involved in a solar energy project make informed decisions without getting lost in technical jargon or marketing hype.





Why has EVA become the standard in the photovoltaic packaging industry?
EVA films dominate the solar energy manufacturing industry because they meet three key requirements: optical transparency (not blocking sunlight), adhesive strength (maintaining the bond between layers under thermal cycling), and cross-linking stability (forming permanent molecular bonds during lamination). Unlike PVB films, used in automotive glass but lacking the UV resistance required for decades of sun exposure, EVA films maintain their performance under continuous solar radiation. While POE films offer superior moisture resistance, they are more expensive and require different processing equipment—therefore, EVA films are the practical choice for most standard solar modules.



The cross-linking process is the key difference between EVA and ordinary plastic films. During lamination (typically at 140–150°C), peroxide additives trigger the formation of chemical bonds between polymer chains, transforming the film from a meltable thermoplastic into a durable thermosetting material. This prevents the film from remelting or deforming when the panel temperature reaches 70–85°C in high-temperature climates.



High adhesion and water resistance: two uncompromising performance requirements
The EVA film must have a peel strength of at least 50 N/cm at the glass-EVA interface, and a moisture permeability of less than 0.5% to prevent delamination and corrosion of the module over its 25-year lifespan. These are not arbitrary values—they are thresholds at which failure modes begin to appear.



What happens when the adhesive fails?
Several specific problems arise when EVA loses adhesion to the glass or backsheet. Edge delamination allows moisture to seep into the perimeter of the module, corroding cell interconnects and forming resistive hotspots. During temperature cycling, mechanical stress concentrates in the unbonded areas, accelerating cell cracking. Hotspot formation reduces power output and can potentially cause a fire when current bypasses the damaged cell via a high-resistance path.



The IEC 61215 standard requires components to pass thermal cycling tests (200 cycles between -40°C and 85°C) and wet-freeze tests (10 cycles at 85% humidity, followed by a freeze test). Actual performance often differs from laboratory results because field conditions include UV degradation, mechanical loads such as wind and snow, and voltage-induced stress—factors that can accelerate the adhesive failure of low-quality films.

It offers superior waterproofing compared to standard membranes.
High-performance EVA films effectively block moisture migration through the polymer matrix and at the interface between the film and glass or backing. In coastal or high-humidity environments, water vapor can permeate standard EVA films at a rate exceeding 1% per year, leading to visible corrosion within 5-10 years. The critical threshold is typically a sustained relative humidity of 60-85% and a temperature above 40°C—conditions common in tropical and coastal regions.



Standard EVA formulations begin to show measurable performance degradation after 15-20 years of use under the combined effects of UV radiation and humidity. Components using lower-grade films may pass initial certification, but within the second decade of operation, they may exhibit milky discoloration (a sign of acetic acid release from hydrolysis) or grid line corrosion.



When will customized EVA film production truly become important?
Customizing EVA film specifications is only crucial when project requirements deviate from standard component architectures, such as bifacial designs, building-integrated photovoltaics (BIPV), or non-standard glass thicknesses. Most residential and commercial installations use industry-standard configurations that are perfectly compatible with off-the-shelf EVA films.



Variations in film thickness (0.45 mm to 0.6 mm) primarily affect optical efficiency and mechanical cushioning performance. Thinner films can reduce material costs and light absorption, but offer weaker protection against microcracks in the battery during handling. Thicker films can improve durability in high-stress environments (e.g., high-traffic rooftop installation systems), but may trap more air bubbles during lamination if process parameters are not adjusted.



When solar panels face extreme environments, such as intense ultraviolet radiation at high altitudes, drastic temperature fluctuations in deserts, or salt spray corrosion in marine environments, additives such as UV stabilizers and anti-reflective coatings must be added. For standard ground-mounted or rooftop systems in temperate climates, these additives typically offer only minor improvements rather than necessary upgrades.



The adjustment of crosslinking speed depends on the compatibility of the lamination production line, not the component performance. Fast-curing formulations are suitable for high-volume production lines but require precise temperature control; while slow-curing solutions offer process flexibility for smaller manufacturers. The final product—once fully crosslinked—has identical performance.



In practice, manufacturers like Shengding offer both standard and custom formulations, enabling project teams to select the appropriate film specifications based on actual needs, rather than defaulting to high-end products that offer no clear value for a particular application. This approach can reduce costs and delivery times for projects designed using traditional modular designs.



Factors determining the reliability of actual EVA film supply
The reliability of EVA film supply depends on three practical factors: the stability of raw material sourcing (especially the availability of VA monomers), the flexibility of the production line, and the logistics infrastructure—rather than supplier promises or marketing guarantees.



The production cycle for standard-sized EVA film is typically 2-4 weeks, while custom formulations requiring new additives or quality verification take 5-8 weeks. After production, sea freight adds another 3-6 weeks, depending on the destination port and customs clearance. Air freight can reduce delivery time to 5-10 days, but costs will increase by 300-500%.



During the Chinese New Year, due to the complete shutdown of factories (usually for 2-3 weeks) and the logistical backlog caused by the gradual resumption of factory operations, there is typically a 4-6 week gap in order delivery. "Normal resumption of work" usually means that production has restarted, but the backlog of orders will create a queue before new orders enter the production process. Therefore, to verify the actual shipment status, it is necessary to check the production completion date and bill of lading documents, rather than the estimated shipment date.



Suppliers with diversified raw material sources and dedicated production capabilities can maintain a stable supply during peak demand periods or supply disruptions. Shengding's multi-site production network and direct VA unit procurement relationships enable it to meet order demands during peak seasons, while smaller suppliers may face lengthy delays—crucial for large projects with fixed timelines.



For global projects, selecting a reliable EVA film supplier means assessing actual production capacity (number of machines and output per plant), raw material inventory levels (buffer inventory weeks), and a proven on-time delivery rate—these verifiable metrics are better predictors of performance than promotional claims.



Frequently Asked Questions about EVA Film Selection

How to choose between standard EVA film and custom EVA film for laminated glass?
Unless your component design requires non-standard glass thickness, special environmental resistance, or specific lamination equipment compatibility, use standard film. Custom formulations will extend delivery times by 2-4 weeks, and offer no performance improvement for standard installations.



What is the actual delivery time for EVA thin films in solar energy applications?
Standard specifications: 2-4 weeks for production and shipping. Custom formulations: 5-8 weeks. If ordered during or immediately after the Chinese New Year, an additional 4-6 weeks will be required.



How can I verify the supplier's shipping status after the Spring Festival?
Please request the production completion date and the freight forwarder's booking confirmation, not the estimated shipping date. Confirm whether your order is currently in production or is still awaiting processing of holiday backlog orders.

Shengding Advanced Materials Co., Ltd. is a high-tech enterprise specializing in the R&D and production of interlayer films for laminated glass. The company independently masters core film-forming technologies, and its products have passed numerous authoritative domestic and international certifications, enabling the localization of high-end interlayer film materials.

EVA films offer high light transmittance, resistance to yellowing, ease of processing, and excellent cost-effectiveness. They cover high-temperature ultra-transparent, low-temperature photovoltaic, and colored decorative series, with a processing temperature range of 90–130°C and a simple, stable hot-pressing process. They firmly bond glass fragments to prevent shattering and flying debris, and are widely used in architectural decorative glass, interior partitions, photovoltaic modules, and smart dimmable glass. The colored series supports customization to meet the needs of personalized projects such as landscape railings and art glass.

TPU optical films are the company’s high-end core products, featuring excellent impact resistance and bulletproof/explosion-proof properties. They maintain good toughness even in low-temperature environments and can be directly laminated to glass and PC sheets to effectively absorb impact energy and prevent shatter. They are suitable for highly demanding applications such as aircraft windows, high-speed rail windows, security bulletproof glass, and high-end curtain walls.

The company can customize specifications and parameters according to client project requirements and provides comprehensive technical support. EVA and TPU films complement each other, offering safe and reliable turnkey solutions for laminated glass interlayers in sectors such as construction, photovoltaics, rail transit, security, and aviation. Our products are exported to markets both domestically and internationally.


Translated with DeepL.com (free version)