Hot Selling Tpu Interlayer Film

Dear readers, thank you for your continuous attention to Foundite website. As a professional manufacturer of high-end TPU film, we not only provide high-quality products, but also strive to provide you with the most comprehensive information and solutions. Today, We deeply explore the different properties of three materials: TPU film, PVC and silicone, and demonstrate the advantages of TPU film in multiple fields.
一、Practical application display of TPU film
1.High-end mobile phone protection case
In the manufacturing of smart phone protective cases, a well-known brand chose Foundite TPU film. Compared with traditional PVC and silicone materials, TPU film protective cover not only has high transparency and stronger wear resistance, but also has better anti-yellowing properties. After a long time of use, the TPU film still maintains the original luster and clarity, while the PVC and silicone cover showed obvious wear and yellowing.
2.sports shoes material
An international sports brand in the selection of shoe materials, using Foundite TPU film. The elasticity and resilience of the TPU film can provide better comfort and support for the sneakers. After thousands of kilometers of running tests, TPU films showed less wear and higher durability, while PVC and silicone materials showed significant wear and reduced performance.
3.medical equipment
In the medical field, a manufacturer of precision equipment chose Foundite TPU film as the coating material. The high transparency, chemical resistance, and biology ability of TPU films make them ideal for medical devices. During disinfection and long-term use, TPU film coating maintained good performance, while PVC and silicone coating experienced aging and rupture problems.
二、Performance comparison: to see the advantages of TPU film
-The wear resistance and tear resistance of TPU film enable it to maintain excellent performance for long use.
-High transparency and anti-yellowing performance make the product look more attractive and enhance the brand image.
-Good elasticity and resilience energy, to provide a better use experience for the product.
Foundite TPU film, with its excellent performance in many cases, has proved its advantages in the selection of high-end product materials. We believe that you can see the value of TPU film more clearly. To choose Foundite is to choose a reliable partner, and let us work together to create better quality, more environmentally friendly products. Contact us immediately to start your journey of TPU film application!

Project Background
A commercial complex in a core business district of a certain city has a total construction area of ​​approximately 120,000 square meters, encompassing three functional areas: a shopping mall, office buildings, and an underground parking garage. The project's exterior facade features a large-area glass curtain wall (total area of ​​3,800 square meters). The entrances and exits of the underground parking garage and the sightseeing elevators in the office building require the use of safety laminated glass. The glass is required to possess core properties such as impact resistance, fall prevention, and sound insulation, while also meeting industry standards for fire resistance, weather resistance, and environmental protection in commercial buildings. After extensive investigation and sample testing, the project ultimately selected Foundite's EVA interlayer as the core material for the laminated glass.

Project Requirements
1. Safety Protection:
The glass breaks without sharp shards flying everywhere, and can withstand accidental impacts (such as falling objects from heights or collisions with people), avoiding secondary injuries.

2. Functionality adaptation:
The curtain wall glass must withstand outdoor wind, rain and ultraviolet radiation, the sightseeing elevator glass must have good light transmittance (light transmittance ≥90%), and the glass in the underground parking garage area must take into account both sound insulation (noise reduction ≥35dB) and fire resistance.

3. Construction compatibility:
The interlayer membrane needs to be compatible with large-size glass processing (maximum single glass size 3.2m×1.8m), and after hot pressing, there should be no bubbles or delamination, meeting the requirements for rapid on-site installation;

4. Environmental standards:
It complies with EU RoHS environmental certification, releases no formaldehyde or other harmful substances, and meets the green environmental protection requirements of commercial buildings.



Solution
Based on the project requirements, Foundite customized a high-transparency, flame-retardant EVA glass interlayer, as detailed below:
1. Product selection:
It uses a 0.76mm thick high-transparency EVA film with added flame retardant formula to balance light transmittance and fire resistance; for areas with sound insulation requirements, a double-layer EVA film composite structure (total thickness 1.52mm) is used to improve sound insulation effect.

2. Processing technology:
We collaborate with our clients' glass processing plants to provide guidance on hot pressing technology, controlling the temperature at 120-140℃ and the pressure at 0.6-0.8MPa to ensure that the EVA film adheres perfectly to the glass without any defects.

3. Customized services:
EVA film is pre-cut according to the glass size of different areas to reduce on-site processing waste and improve construction efficiency; third-party testing reports (impact resistance, fire resistance rating, environmental certification, etc.) are provided to meet project acceptance requirements.

Implementation effect
1. Safety performance meets standards:
After the project was put into use, a simulated impact test showed that the laminated glass broke with a mesh-like crack pattern, and the EVA film firmly absorbed the fragments without any splashing. It passed the local building safety inspection and acceptance.

2. Fully functional requirements:
The curtain wall glass has a light transmittance of 91% and no obvious reflection distortion; the sightseeing elevator glass has high clarity and does not affect the view; the underground parking garage area has a significant sound insulation effect, effectively blocking vehicle noise; the flame-retardant EVA film has passed GB/T 8624-2017 B1 fire protection certification, which complies with the fire protection code for commercial buildings.

3. Excellent construction and durability:
During the processing, the EVA film has a 100% forming rate with no bubbles or delamination issues, and the on-site installation efficiency is improved by 30%. After 18 months of use, the glass curtain wall shows no signs of aging or yellowing, the bonding strength between the EVA film and the glass remains stable, and there are no after-sales quality issues.

4. Customer feedback:
The project owner expressed approval of the product's safety performance, construction adaptability, and environmental standards. The second phase of the project has confirmed that our company's EVA glass interlayer will continue to be used, and we have recommended it to other commercial building projects in the same industry.

As raw material costs soar across industries, some suppliers still claim, "Our prices won't change." This sounds incredibly appealing to purchasing managers whose quarterly budgets are always tight. Is this merely a clever marketing tactic? A temporary loss-making promotion? Or is there a genuinely sustainable business model behind it?



The issue is not whether there should be any substantial price stability commitments, but rather understanding what makes these commitments possible , when they can actually be fulfilled , and what you should ask before fully trusting them .





The true meaning of the "materials price stabilization commitment" (and what it doesn't cover)
The promise itself: what do you really get out of it?
Most suppliers will tell you what they've promised, but few will explain how they will deliver. A material price stability commitment typically means maintaining price stability over a specific period, unaffected by external market fluctuations. But the key issue is—the real problem isn't the commitment itself, but the operational foundation that underpins it.



When suppliers claim that "our raw material costs remain stable during market fluctuations," they are essentially saying that they have found a way to absorb or delay cost increases. But the capacity to absorb these increases is limited, and the delayed cost increases will eventually come.



This promise cannot protect you from the following:
It's easy for people to assume that "price stability" means "no surprises." But these promises usually come with limitations, which aren't always explicitly stated beforehand:

• Order volume fluctuations : Terms may be adjusted if your demand unexpectedly decreases or surges. • Specification changes : Customization requirements or changes in material grades are generally not covered by the agreement. • Force majeure events : Extreme and unforeseen events often invalidate stability clauses. • Contract term limitations : Most commitments have an expiration date—what happens after the expiration date is just as important as what happens during the expiration date.



Understanding these boundaries is not about being pessimistic, but about avoiding unrealistic expectations six months from now.



Two real factors contributing to price stability
Ensure adequate inventory before market volatility occurs.

This is the most direct mechanism, but it also carries the greatest risk for suppliers. If manufacturers have already purchased and paid for several months' worth of raw materials before prices surge, they can theoretically maintain price stability while clearing inventory.

The reason for its effectiveness in the short term: Suppliers' cost base remains at pre-price-increase levels. They currently do not incur additional costs—they are simply depleting old inventory.



Why this approach won't work in the long run: Inventory holding costs are real (warehousing, capital tied up, risk of material loss). Once inventory runs out, the situation changes unless they have long-term hedging contracts with upstream suppliers. Furthermore, if market prices fall instead of rise, they face the problem of excessively high inventory prices.



The real question you should be asking isn't "Do you have any inventory?", but rather "How many months can your inventory last, and what happens after it runs out?"



Long-term upstream supplier agreements that transfer stability downstream
A more sophisticated approach is to establish a stable supply chain by having suppliers enter into long-term contracts with their suppliers. These agreements may include fixed prices for 12-24 months, sales volume commitments, or financial instruments to hedge against price volatility.

Companies like Shengding demonstrate a significant difference in their approach to ensuring supply chain stability, which sets them apart. They don't merely promise price stability and rely on favorable market conditions; instead, they have built dedicated upstream partnerships to absorb volatility before it impacts consumers. This doesn't mean providing unlimited guarantees, but rather that their commitment is based on contracts, not optimistic predictions.



This approach has been able to continue because suppliers don't have to risk their own inventory or profits—they transfer some of the risk management upstream through structured agreements.



In conclusion: These arrangements require significant relationship capital, larger commitments, and typically longer preparation time. They are not temporary responses to market conditions, but rather well-planned strategies.



How to evaluate a supplier's price stability commitment
When suppliers claim to be able to control costs in the face of rising prices, the following points can help distinguish between genuine capability and wishful thinking:

Inquire specifically about their inventory situation. How much inventory do they currently have that can last for several months? What is their purchase price? What is their replenishment plan?



Request to see their upstream contracts.You don't need to see confidentiality clauses, but understanding whether their relationships with raw material suppliers are 6-month, 12-month, or spot market transactions will give you a deeper understanding of their actual stable operational capabilities.



Clearly define the triggering conditions for price adjustments.Every commitment has its limits. Understanding precisely what situations will lead to price changes helps you develop more realistic plans, rather than simply envisioning the best-case scenario.



Look at past performance, not just promises. Have they maintained price stability during past market fluctuations? Can they provide testimonials from clients who have weathered complete price cycles?



For companies engaged in e-commerce and fast supply chain businesses, these issues are not merely due diligence, but essential parts of operations. Unexpected price fluctuations three months after product launch can completely disrupt profit margin plans.



Is win-win cooperation possible during periods of rising prices?
The harsh reality is that truly win-win supplier partnerships are rare, though not entirely nonexistent, during periods of rising costs. They simply take a form quite different from what most people expect.



A true win-win situation doesn't mean neither party feels any loss. It means both parties share the risk proportionally and remain transparent when circumstances change. Suppliers like Shengding pre-define clear terms specifying the duration of stability guarantees, the sales commitments supporting these guarantees, and how communication will proceed if market conditions deviate from expectations.



For buyers, being a "winner" means more than just price stability; it means predictability and certainty in planning. For suppliers, being a "winner" means more than just maintaining profit margins; it means securing a stable sales commitment, thereby justifying their upstream risk management investments.

What happens after the commitment period ends?
Many price stability promises quietly fail here. A promise might hold perfectly for six months, but then it breaks down when you ramp up production or develop a marketing strategy around a specific price point.



Make sure you confirm everything before signing:

What is the renewal process? How far in advance will I be notified of price changes? Is the price adjustment gradual, or is it a sudden increase?

The goal is not to find a supplier that will never raise prices, but to find a supplier whose price changes are transparent, gradual, and who can communicate early on so that you can adjust your plans accordingly.



Frequently Asked Questions about Material Price Stability
If suppliers promise price stability, how can supply stability be guaranteed during periods of shortage?

Typically, without substantial inventory reserves or upstream contracts to guarantee supply and price, companies cannot indefinitely meet both demands simultaneously. This is why understanding a supplier's actual capacity (not just their commitments) is so crucial. Companies with mature supply chain stability typically maintain dedicated buffer inventories for this purpose, but these buffer inventories are also finite.



Why do some material prices remain unchanged despite market trends?

Typically, this is because suppliers purchase inventory before the trend begins, locking in long-term upstream prices, or temporarily incurring costs to maintain customer relationships. The key question is sustainability—how long can they maintain this state before economic realities force them to adjust? Shengding's approach combines structured inventory management with upstream partnerships, creating a longer period of stability than spot market sourcing.



What is the difference between a price stabilization commitment and a fixed-price contract?

Fixed-price contracts typically lock in a specific price and are legally binding. Price stabilization commitments, on the other hand, are usually commercial commitments with greater flexibility and exceptions. Always read the contract terms carefully—the specific obligations and exit clauses clearly stated in the agreement are far more important than the contract name.

When manufacturers specify the use of EVA film for new projects, they often encounter an unexpected problem: a film that performs perfectly in one application fails completely in another. This confusion is understandable—after all, aren't all EVA films EVA films?



That's not the case. In fact, EVA (ethylene-vinyl acetate copolymer) film plays drastically different roles in different application areas . In the construction industry, it is used as a structural adhesive; in the automotive glass industry, it must meet stringent optical transparency requirements; and in the solar panel industry, it is used as a protective encapsulation material that can withstand decades of environmental erosion.



For first-time buyers of EVA film, this presents a practical challenge: how to assess whether a particular film and its manufacturer can truly meet the unique performance requirements of your application?



This article will explore the key decision points that determine the suitability of EVA films for major applications and explain the considerations when assessing production capacity and engineering support.



The practical applications of EVA film (and why the same product cannot be used in all situations)
Architecture: Structural Integrity and Optical Clarity
EVA films used in the construction industry are primarily used as an intermediate adhesive in laminated safety glass . This film must maintain its bond strength under thermal cycling, humid conditions, and mechanical stress—but unlike automotive glass, building facades typically tolerate slight optical distortion.



Key Specifications:Is adhesive strength more important than absolute optical transparency? In many construction projects, the answer is yes. But this means that even if an architectural-grade EVA film has excellent adhesive properties, it may not meet automotive industry standards.



Automotive Glass: Transparency Standards Are Crucial
Automotive applications have extremely high requirements for optical performance. EVA films used in automotive glass must meet one of the industry's most stringent transparency standards—typically requiring a light transmittance of over 90% and extremely low haze.



However, buyers often overlook one crucial point: transparency depends not only on the clarity of the film itself but also on the uniformity of the adhesive layer, the consistency of the roll thickness, and the compatibility of the processing temperature with automotive glass. This is why EVA films that meet structural specifications may still be rejected by automotive OEMs—not because the film itself is defective, but because its tolerance range is completely different from that of automotive glass.



Solar panel lamination: Beyond basic encapsulation
In photovoltaic modules, EVA film not only protects solar cells but also actively participates in light transmission and thermal management . This film must maximize the cell's light transmittance while resisting performance degradation caused by ultraviolet radiation, providing moisture protection throughout the module's 20-25 year lifespan, and withstanding thermal cycling from -40°C to +85°C without delamination.



Specification Trap: Many buyers ask "How to choose EVA film for solar panels" based solely on thickness. However, thickness is only one variable. For long-term performance, curing performance, crosslinking density, and moisture resistance are more important than the initial film thickness.

Understanding the adhesive properties of EVA films: Why adhesive strength is not a single value
One of the most misunderstood aspects of EVA film is its adhesiveness. Buyers often ask for "peel strength values," as if adhesiveness were a fixed property of the material. This is not the case.



Adhesion strength depends on the objects being bonded. The adhesive properties of EVA films vary depending on the substrate—glass-to-glass lamination requires specific surface energy matching, glass-to-metal lamination requires different cross-linking chemistry, while glass-to-backsheet lamination in solar modules needs to maintain moisture-resistant adhesion under ultraviolet radiation.



Films with excellent glass adhesion may perform poorly when bonded to low surface energy polymers. Therefore, adhesion testing should simulate actual substrate combinations —laboratory test results for standard glass samples may not predict real-world application performance.

The curing process changed everything.
The adhesive strength of EVA films is only "activated" after lamination. The curing process—temperature, pressure, and residence time—determines the final adhesive strength more than the chemical composition of the film itself.



In fact, without understanding the lamination parameters recommended by the EVA film manufacturer, it's impossible to fully evaluate their products. Suppliers offering "engineering support" should provide optimized curing profiles for your specific application, not just generic data sheets.

Moisture-proof performance of EVA and PVB films: A flawed comparison that ignores the true decision point.
Buyers often ask which has better moisture-proof properties: EVA film or PVB (polyvinyl butyral). This question reveals a common misconception: there is no inherent superiority or inferiority in moisture-proof properties between the two materials—their performance depends on the formulation and the application environment .



After proper cross-linking, EVA films typically exhibit excellent long-term moisture resistance in high humidity environments , making them more suitable for solar panel encapsulation in tropical climates, architectural glass in coastal areas, and applications requiring more than 20 years of outdoor durability.



However , PVB still dominates the automotive laminated glass market , not because of its moisture-proof properties, but because of its mature certification pathways, sound insulation properties that EVA films lack, and regulatory approval history that meets automotive safety standards.



Misjudgment error: Choosing EVA over PVB solely because of its "better moisture resistance" ignores application-specific requirements such as acoustic performance or regulatory restrictions.

Optimal EVA film thickness for laminated glass: a specification that is inextricably linked to specific circumstances.
What is the optimal thickness? is one of the most frequently asked questions by buyers new to EVA film lamination processes. The frustrating answer is: it depends entirely on your performance requirements and processing limitations .



Thicker doesn't always mean stronger. Beyond a certain thickness, increasing the thickness reduces light transmittance (which is a problem for solar energy applications), lengthens lamination cycles and increases energy costs, and actually reduces the impact resistance of automotive glass due to reduced flexibility.



In practice, the thickness consistency of the film roll is often more important than the absolute thickness. In most applications, a 0.45 mm film with a thickness deviation of ±0.02 mm performs better than a 0.50 mm film with a thickness deviation of ±0.05 mm—because thickness inconsistency can lead to optical distortion, bubble retention, and weak points in the laminate.



The ability to produce custom EVA films is crucial here. Can the manufacturer maintain tight thickness tolerances within the width and length range you require? This question reflects product quality more than the nominal thickness specification.

The true meaning of "custom EVA film specifications" (and what it doesn't include)
Many EVA film suppliers advertise "custom specifications," but this term is vague. In reality, customization can be divided into three levels—each with a distinct impact on your project.



Level 1: Custom Size (Basic Capability) – Custom size EVA film production refers to cutting standard formulations into rolls of the width and length you require. Most established manufacturers can do this.



Level 2: Formulation Adjustment (requires R&D capabilities) – True customization involves modifying the vinyl acetate (VA) content to achieve flexibility and adhesion control, modifying the curing agent ratio to optimize lamination temperature, and modifying the UV stabilizer formulation to achieve specific environmental exposures.



Level 3: Collaborative Development of New Applications (Rare) – The highest level involves collaborative engineering to develop entirely new formulations for novel applications such as flexible solar modules, curved automotive glass, or explosion-proof glass.



Supplier Qualification Verification Questions: Inquire with the manufacturer about the number of custom formulations they have developed in the past two years, and the application areas these formulations are used in. This can reveal whether "customization" is a genuine capability or merely a marketing term.

How to evaluate the engineering support of EVA film suppliers (Beyond Data Sheets)
While product quality is important, in complex lamination processes, engineering support capabilities often determine the success or failure of a project.



Before recommending products, a truly technically capable supplier should inquire about your process flow in detail, provide optimized curing curves based on your equipment type, offer on-site commissioning support for production trials, and resolve performance issues through root cause analysis, rather than simply replacing the product.



Economic Impact: Even with high-quality films, improper lamination parameter optimization can lead to a 10-30% yield loss. Engineering support is not just a bonus; it directly impacts your production economics.



For manufacturers seeking reliable, one-stop EVA film solutions, technological collaboration is just as important as product specifications.

Making Decisions: A Practical Framework for Supplier Qualification
Instead of evaluating EVA film suppliers solely based on price or product data sheets, consider the following judgment framework:



Phase 1: Application Suitability Validation – Has the vendor successfully delivered the exact same application before? Can they provide reference customers in your industry? Do they understand the specific performance challenges your application faces?



Phase 2: Technical Capability Assessment – ​​What existing testing equipment and quality control systems are available? Can they provide batch-specific test data, not just typical values? How do they handle technical issues or performance complaints?



Phase 3: Service Continuity Assessment – ​​What is their typical lead time and supply stability record? Do they keep stock that meets your specifications, or are all products made to order? How do they handle supply disruptions or quality deviations?



For critical production applications, supply reliability is often more important than marginal cost differences.

Partner with manufacturing partners who understand your application needs
Choosing EVA film is not about finding the "best" product, but about finding the best match between film performance, application requirements, and supplier capabilities .



Application scenarios dictate key specifications; for example, transparency standards in the automotive industry, moisture resistance in solar energy equipment, or structural bonding performance in the construction industry. Supplier capabilities are just as important as product quality—engineering support, custom formulation capabilities, and service continuity often determine project success or failure more than raw material performance.



Shengding specializes in providing engineered EVA film solutions for building, automotive, and solar energy applications, possessing complete in-house production control, customized formulation capabilities, and technical support throughout the product lifecycle. Whether you need reliable standard-grade products or custom-specification products to meet demanding application requirements, we can provide the technical collaboration and production consistency needed for critical projects.



To learn more about our EVA film production capabilities and engineering support, please visit the TPU film manufacturer's website.

Frequently Asked Questions (FAQ)
What are the uses of EVA film in construction?

In the construction industry, EVA films are primarily used as an intermediate adhesive in laminated safety glass. They bond glass panels together, providing structural integrity and safety—in the event of glass breakage, the film holds the fragments together, preventing dangerous shards from flying. Architectural-grade EVA films prioritize strong adhesion and durability over the extremely high optical transparency required for automotive applications.



How does EVA film work in solar module lamination?

During the lamination process of solar panels, EVA thin films encapsulate photovoltaic cells, protecting them from moisture and environmental damage while maximizing light transmittance. During lamination, the film is heated and cross-linked to form a durable protective layer that must maintain its performance for 20-25 years under continuous UV exposure and thermal cycling.



What are the differences in transparency standards for EVA films used in the automotive and construction industries?

EVA films used in automobiles typically require light transmittance exceeding 90%, extremely low haze, and strict limits on optical distortion, as this can affect driver visibility and safety. Optical requirements for architectural applications are more lenient, as slight distortion of building facades is generally acceptable—the focus is on structural bond strength and weather resistance.



Can I use the same EVA film for both solar panels and automotive glass?

Generally, the answer is no. EVA films for solar panels have been optimized over decades to offer excellent UV resistance, moisture protection, and encapsulation properties. Automotive EVA films, on the other hand, prioritize optical transparency, impact resistance, and compliance with specific automotive safety certification standards. Their formulations, curing requirements, and performance standards are vastly different. For specialized applications requiring both properties simultaneously, manufacturers like Shengding can develop custom formulations to balance multiple performance requirements.

Recently, Shengding Advanced Materials Co., Ltd., focusing on the field of new polymer materials, has continued to increase its R&D investment and optimize the intelligent upgrading of its production lines. Orders for its core TPU and EVA film series have grown steadily, and the company has made new progress in expanding its domestic and international markets.

As a provincial-level “Specialized, Refined, Unique, and Innovative” enterprise and a national-level high-tech enterprise, the company specializes in the R&D and production of optical-grade TPU interlayers, as well as EVA films for photovoltaic and decorative applications. It has achieved full autonomy and control across the entire supply chain—from raw material synthesis to film processing—and has taken the lead in drafting relevant national standards for the aerospace sector. Several of its products have broken through foreign technical barriers, successfully replacing imported key materials. Backed by a CNAS-accredited laboratory and multiple invention patents, the company’s products combine high light transmittance, resistance to high and low temperatures, and impact resistance, finding widespread application in aviation equipment, security and bulletproof glass, rail transit, photovoltaic encapsulation, and high-end architectural decoration.

Currently, the company’s production facilities are operating at full capacity. Photovoltaic-grade and ultra-transparent EVA films, along with high-end TPU film materials, are being shipped in bulk to various regions across China and exported to numerous countries overseas, with orders from international customers continuing to increase. Meanwhile, the high-temperature-resistant polymer new materials project is progressing in an orderly manner, further enhancing the company’s product portfolio.

Moving forward, Shengding High-Tech will remain guided by the principles of “new-quality productive forces,” deepen collaborative innovation among industry, academia, and research institutions, continuously refine product performance, and expand application scenarios for high-end materials, thereby contributing to the high-quality development of China’s new materials industry.