EVA is commonly used in greenhouse film formulations to improve properties such as flexibility, low-temperature performance, optical characteristics and thermal retention.
EVA stands for Ethylene-Vinyl Acetate, a copolymer made from ethylene and vinyl acetate.
When EVA is incorporated into greenhouse film, it can change the physical and optical behavior of the film compared with conventional polyethylene film.
For greenhouse applications, EVA is mainly used to help achieve a combination of:
Better flexibility
Improved low-temperature performance
Better thermal properties
Good optical performance
Improved impact resistance
Easier film handling in certain applications
However, more EVA does not automatically mean better greenhouse film.
The correct EVA content and layer design depend on the local climate, crop, greenhouse structure and required film performance.
What Is EVA Greenhouse Film?
EVA greenhouse film is a greenhouse covering that contains ethylene-vinyl acetate copolymer as part of its material formulation.
It may be produced as:
An EVA-containing PE film
A multi-layer greenhouse film with EVA in selected layers
A customized PO greenhouse film incorporating EVA-related functions
Modern greenhouse film is often produced using multi-layer co-extrusion technology, which allows different materials and additives to be placed in different layers.
This makes it possible to combine EVA with functions such as:
UV + IR + AF + Anti-Drip + Light Diffusion
within one greenhouse film.
Why Is EVA Added to Greenhouse Film?
The main reason for using EVA is that it changes the properties of conventional polyethylene.
Compared with standard PE, EVA can provide greater flexibility and can influence thermal and optical performance.
For greenhouse growers, this can be useful in environments where:
Night temperatures are low
Day/night temperature differences are large
Flexible film is preferred
Thermal retention is important
Good optical performance is required
EVA is therefore commonly considered in greenhouse films designed for commercial vegetable, flower and protected-crop production.
1. EVA Can Improve Film Flexibility
One important characteristic of EVA is increased flexibility.
Greenhouse film must withstand:
Installation tension
Wind movement
Folding
Handling
Temperature changes
A more flexible film may be easier to handle during installation and may perform better under repeated movement.
This can be especially useful in colder environments, where some plastic materials can become stiffer.
2. EVA Can Improve Low-Temperature Performance
Temperature has a significant effect on plastic film.
In colder climates, greenhouse covering materials may become less flexible.
EVA can help maintain better flexibility at lower temperatures compared with conventional polyethylene formulations.
For this reason, EVA-containing greenhouse films may be worth considering for:
However, EVA should still be combined with appropriate UV stabilization and film structure.
3. EVA Can Improve Thermal Retention
One of the most important reasons EVA is used in greenhouse film is its influence on thermal performance.
During the day, solar energy enters the greenhouse.
At night, part of this heat can escape as long-wave infrared radiation.
An appropriately designed EVA-containing greenhouse film can help reduce part of this heat loss and improve the greenhouse's thermal performance.
This can be useful for:
For this reason, EVA and IR greenhouse film are often discussed together.
EVA vs IR: Are They the Same?
No.
EVA and IR are related to thermal performance, but they are not exactly the same thing.
EVA
EVA is a polymer material that can be incorporated into the greenhouse film structure.
IR
IR usually refers to infrared-related thermal performance designed to reduce long-wave heat loss.
A greenhouse film can therefore be designed with:
EVA + IR
rather than choosing one or the other.
For example:
PO + EVA + IR + AF + UV
may be used as part of a customized greenhouse film specification.
4. EVA Can Influence Light Transmission
Light transmission is one of the most important properties of greenhouse covering film.
Crops need sufficient photosynthetically useful light for growth.
Depending on the formulation and film structure, EVA can contribute to good optical properties.
However, actual light transmission depends on many factors, including:
EVA content
Film thickness
Number of layers
Diffusion additives
Anti-fog additives
Resin quality
Film aging
Surface contamination
Therefore, buyers should request the actual light transmission specification, rather than assuming that all EVA films have the same optical performance.
5. EVA Can Improve Impact and Mechanical Performance
Greenhouse films must withstand mechanical stress during transportation, installation and use.
EVA can contribute to film toughness and flexibility.
This can help improve resistance to certain mechanical stresses.
However, overall film strength still depends on:
Thickness
Resin
Layer structure
Tensile strength
Tear resistance
Extrusion quality
Therefore:
EVA content alone does not determine greenhouse film strength.
A professional film should be evaluated as a complete material system.
EVA Greenhouse Film vs PE Greenhouse Film
| Feature | Standard PE Film | EVA-Containing Film |
|---|
| Flexibility | Good | Generally higher |
| Low-temperature flexibility | Standard | Often better |
| Thermal performance | Depends on formulation | Can be improved |
| Light transmission | Good | Can be very good |
| Cost | Generally lower | Generally higher |
| Multi-year greenhouse use | Possible | Possible |
| Cold climate suitability | Depends on formulation | Often worth considering |
This does not mean EVA is always better than PE.
For many greenhouse projects, PE film may already provide the required performance at a lower cost.
The correct choice depends on the project.
EVA Greenhouse Film vs PO Greenhouse Film
This comparison is slightly different.
“PO greenhouse film” usually describes a multi-functional greenhouse film system, while EVA refers to a particular polymer material that can be incorporated into the film structure.
Therefore, EVA and PO are not necessarily competitors.
A PO greenhouse film can contain EVA.
For example, a customized PO film may include:
EVA
UV stabilization
IR
AF
Anti-drip
Light diffusion
This is why buyers should always ask for the actual film formulation and functions, not only the product name.
Does More EVA Mean Better Greenhouse Film?
No.
This is an important purchasing point.
Some buyers ask:
What percentage of EVA is in the film?
This can be useful information, but the highest EVA percentage is not automatically the best specification.
Increasing EVA can affect:
The optimum EVA content depends on what the film needs to achieve.
For example, a greenhouse in a cold climate may have different requirements from a greenhouse operating in a hot desert climate.
The film should therefore be designed around performance, not simply the highest additive percentage.
When Should You Consider EVA Greenhouse Film?
EVA-containing greenhouse film may be especially worth considering when the project requires:
Cold-Climate Performance
Where nighttime or winter temperatures are relatively low.
Thermal Retention
Where reducing nighttime heat loss is important.
Flexible Film
Where good flexibility is needed for installation and use.
Commercial Greenhouse Production
Where a combination of optical, thermal and mechanical properties is required.
High-Value Crops
Where growers are willing to invest in more precisely designed greenhouse covering materials.
Is EVA Suitable for Hot Climates?
It can be, but EVA should not automatically be considered necessary for every hot-climate greenhouse.
In a hot region, buyers may prioritize:
UV stabilization
Light diffusion
Heat management
Ventilation
Anti-fog
Film durability
For example, in a high-solar-radiation region, light diffusion and UV resistance may be more important than thermal retention.
This is why greenhouse film should be selected according to climate rather than using one specification worldwide.
Is EVA Suitable for Cold Climates?
Yes, EVA-containing greenhouse films are often worth evaluating for cold climates because of their flexibility and thermal characteristics.
Important complementary functions may include:
A cold-climate greenhouse may therefore use a specification such as:
EVA + IR + AF + UV
depending on the project requirements.
What Crops Can Use EVA Greenhouse Film?
EVA greenhouse film can be used for many protected crops, including:
Tomato
Cucumber
Pepper
Strawberry
Melon
Flowers
Seedlings
Nursery crops
The crop itself does not determine whether EVA is necessary.
Instead, the decision depends on the growing environment required by the crop.
For example, tomato production in a cold winter region may benefit more from thermal-retention features than tomato production in a very hot tropical region.
EVA and Anti-Fog Performance
EVA is not the same as an anti-fog additive.
If condensation control is required, greenhouse film should normally be designed with a dedicated AF or anti-drip system.
Therefore, a film may combine:
EVA + AF
to provide both material performance and condensation control.
This distinction is important because buyers sometimes assume that EVA automatically means anti-fog.
It does not.
EVA and Light Diffusion
EVA and light diffusion are also different functions.
EVA affects the film material properties.
Diffusion additives are used to scatter incoming sunlight.
A greenhouse film can therefore combine:
EVA + High Diffusion
when both thermal/material performance and improved light distribution are required.
For strong-sunlight regions, this combination may be evaluated together with UV stabilization and other optical requirements.
EVA and UV Stabilization
EVA does not replace UV stabilization.
Greenhouse films are continuously exposed to ultraviolet radiation.
A suitable UV stabilization system is still necessary to protect the film from premature degradation.
Therefore:
EVA ≠ UV protection
A multi-year EVA greenhouse film should still include a properly designed UV stabilization system.
How Much EVA Should Greenhouse Film Contain?
There is no universal percentage suitable for every greenhouse.
The appropriate EVA content depends on:
Climate
Film thickness
Layer structure
Thermal requirements
Optical requirements
Mechanical requirements
Budget
Other additives
Instead of simply asking:
What percentage of EVA do you use?
buyers should also ask:
What performance is this EVA formulation designed to achieve?
This is a much better purchasing question.
How Does EVA Work in Multi-Layer Greenhouse Film?
Modern greenhouse films can be produced using multi-layer co-extrusion.
Different layers can have different responsibilities.
For example:
Outer layer
UV and weather resistance.
Functional layers
Mechanical, optical and thermal properties.
Inner layer
Anti-fog or anti-drip performance.
EVA can be incorporated into selected layers according to the required film design.
This allows manufacturers to use the material more precisely rather than treating the entire film as one uniform layer.
Example EVA Greenhouse Film Specification
Consider a greenhouse project with:
Climate: Cold nights
Crop: Tomato
Required lifetime: 3 years
Thickness: 200 micron
Requirement: Good thermal retention and condensation control
A potential film design could include:
PO / EVA + UV + IR + AF + Anti-Drip
The final specification would still depend on:
Local UV conditions
Greenhouse structure
Temperature
Film width
Growing method
This example shows why EVA should be selected as part of a complete greenhouse film system.
Common Mistakes When Buying EVA Greenhouse Film
Mistake 1: Assuming Higher EVA Content Is Always Better
Film performance is more important than one percentage.
Mistake 2: Assuming EVA Means IR
EVA and IR are related but different concepts.
Mistake 3: Assuming EVA Means Anti-Fog
AF requires a separate condensation-control system.
Mistake 4: Ignoring UV Stabilization
EVA does not replace UV protection.
Mistake 5: Choosing EVA Without Considering Climate
Some projects may benefit more from diffusion, UV or other functions.
What Should Buyers Ask an EVA Greenhouse Film Manufacturer?
Before requesting a quotation, provide:
| Information | Example |
|---|
| Country / Region | Uzbekistan |
| Crop | Tomato |
| Greenhouse Type | Multi-span |
| Thickness | 200 micron |
| Width | 12 m |
| Length | 100 m |
| Service Life | 3 years |
| EVA | Required |
| IR | Required |
| AF | Required |
| Diffusion | Depending on project |
This allows the manufacturer to recommend a more appropriate formulation.
Frequently Asked Questions
What does EVA stand for in greenhouse film?
EVA stands for Ethylene-Vinyl Acetate.
It is a polymer used in greenhouse film formulations to modify flexibility, thermal and optical properties.
What is the main benefit of EVA greenhouse film?
Its main advantages can include improved flexibility, low-temperature performance and thermal characteristics.
The exact benefits depend on the formulation.
Is EVA greenhouse film better than PE?
Not automatically.
EVA may provide additional properties, while standard PE can offer excellent cost-performance for many greenhouse applications.
Does EVA keep a greenhouse warmer?
An appropriately designed EVA-containing film can contribute to improved thermal performance and reduced nighttime heat loss.
For stronger thermal-retention requirements, EVA may also be combined with IR functionality.
Does EVA provide UV protection?
No.
UV stabilization requires a separate UV stabilization system.
Is EVA film anti-fog?
Not automatically.
Anti-fog performance requires suitable AF additives or a dedicated anti-fog layer.
Is higher EVA content better?
Not necessarily.
The correct EVA content should be determined by the required performance of the greenhouse film.
Can EVA be used in PO greenhouse film?
Yes.
EVA can be incorporated into a multi-layer PO greenhouse film formulation together with UV, IR, AF and diffusion functions.
EVA Greenhouse Film Manufacturer in China
GH Agricultural Film manufactures customized greenhouse films for commercial agricultural applications.
Available greenhouse film solutions include:
Using 7-layer co-extrusion technology, different materials and functional additives can be incorporated into different film layers according to project requirements.
Customization options include:
Thickness
Width
Length
UV service life
EVA formulation
IR
AF
Anti-drip
Light diffusion
Packaging
Film width can be customized up to 20 meters.
Get an EVA Greenhouse Film Recommendation
Not sure whether your greenhouse needs EVA?
Send us:
Country / Region
Crop
Greenhouse Type
Film Thickness
Required Service Life
Required Width and Length
Local Climate Conditions
We can evaluate whether EVA is suitable and recommend an appropriate combination of:
EVA + UV + IR + AF + Anti-Drip + Light Diffusion
for your greenhouse project.