Extra Clear EVA Interlayer（High flow)

HJ-AT High Flow Extra Clear EVA Interlayer for Laminated Glass

HJ-AT is E&N HONJIA's high-flow extra clear EVA interlayer developed for laminated glass applications where both optical appearance and EVA flow during processing are important.

Compared with our HJ-HT lower-flow grade, HJ-AT softens and moves more readily during the lamination cycle.

This higher fluidity helps the EVA spread across the glass surfaces and reach areas where more material movement is needed during heating.

It is particularly useful for glass processors working with laminated structures where a standard or lower-flow EVA does not provide enough flow.

Visible Light Transmittance: >90.6%
Haze: <0.29%
UV Blocking: ≥99%
Standard Thickness: 0.38 mm / 0.76 mm
Available Width: Up to 2600 mm
Flow Characteristic: High Flow

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PRODUCT OVERVIEW

Extra Clear EVA with Higher Flow During Lamination

Different laminated glass structures require different EVA behaviour.

Some processors want the EVA to remain relatively stable during heating.

Others need the interlayer to soften and move more freely so that it can spread across the glass surface and fill areas within the laminated structure.

HJ-AT was developed for the second situation.

Its higher-flow formulation provides more material movement during heating than HJ-HT.

This makes it useful when the glass processor needs:

Better wet-out across the glass surface

More EVA movement during heating

Improved penetration into suitable laminated structures

High optical clarity after lamination

Outdoor-grade EVA performance

High flow does not mean that HJ-AT should replace a lower-flow EVA in every production line.

The correct choice depends on the actual glass structure, EVA thickness, equipment and lamination cycle.

LAMINATED GLASS STRUCTURE

How HJ-AT Is Used in Laminated Glass

A typical HJ-AT laminated glass structure is:

The EVA film is placed between two clean glass sheets before lamination.

The complete assembly is then processed under vacuum and heat.

During heating, HJ-AT softens and begins to flow across the glass surfaces.

Because HJ-AT has higher fluidity than HJ-HT, the EVA can move more readily during this stage of the process.

After the correct lamination cycle, the EVA crosslinks and bonds the glass layers into one laminated panel.

WHAT DOES HIGH FLOW MEAN?

Understanding HJ-AT Flow Behaviour

"High flow" describes how the EVA behaves when it is heated.

Before lamination, the EVA is a solid flexible sheet.

As temperature increases, the material softens.

A higher-flow EVA such as HJ-AT moves more easily during this stage than a lower-flow formulation.

This can provide several practical advantages in the right glass structure.

Better Glass Surface Wet-Out

The softened EVA can spread more readily across the contact surfaces between the glass and interlayer.

Good wet-out is important for obtaining a clear, consistent laminated structure.

More Material Movement

For structures where the EVA needs to move into small spaces or around suitable components, higher fluidity can make processing easier.

Useful for More Demanding Structures

Some laminated structures are less forgiving than simple flat glass + EVA + glass combinations.

When more EVA movement is required, HJ-AT provides another processing option.

More Flexible Process Selection

Processors can choose between HJ-AT and HJ-HT according to whether they need more or less EVA movement during heating.

This is more practical than trying to force one EVA grade to work for every laminated glass structure.

HIGH FLOW DOES NOT MEAN "BETTER FOR EVERYTHING"

This is important.

A higher-flow EVA is not automatically better than a lower-flow EVA.

More flow can be useful when the structure requires better penetration or more movement during heating.

But some glass processors may prefer lower flow when:

• Edge control is important

• Excessive EVA movement is not desirable

• The glass structure is simple

• Existing furnace settings already work well with a lower-flow product

For this reason, we recommend choosing the EVA according to the actual lamination structure rather than simply choosing the product with the highest flow.

PRODUCT FEATURES

Extra Clear Optical Appearance

HJ-AT provides visible light transmittance above 90.6% with haze below 0.29%.

This makes it suitable for clear architectural laminated glass where transparency and visual appearance are important.

High Flow During Heating

HJ-AT is designed to move more readily during the heating stage than HJ-HT.

This provides processors with an EVA option for structures that require more wet-out and penetration during lamination.

Strong Mechanical Properties

HJ-AT has tensile strength above 20 MPa and elongation at break of at least 800%.

These properties provide a combination of strength and flexibility for laminated-glass processing and the finished interlayer.

Reliable Glass Bonding

Glass adhesion is above 77 N/cm under the specified test conditions.

Actual bonding performance also depends on glass cleanliness, vacuum conditions and the complete lamination process.

High Crosslinking Rate

HJ-AT has a crosslinking rate above 85% under the specified processing conditions.

Correct crosslinking is an important part of obtaining stable EVA performance after lamination.

UV Protection

HJ-AT blocks at least 99% of UV radiation in the 280–380 nm range under the specified test conditions.

The product also shows a UV aging ΔYI value below 1 in the current product data.

Low Water Absorption

Water absorption is ≤0.1%.

This supports its use in laminated-glass applications where moisture-related performance is important.

APPLICATIONS

Where HJ-AT High Flow EVA Can Be Used

HJ-AT is designed for architectural and other laminated-glass structures where high clarity and increased EVA flow are useful.

Architectural Curtain Walls

HJ-AT can be used in clear laminated architectural glass where transparency and outdoor performance are required.

Its high-flow behaviour provides an option for processors who need more EVA movement during their lamination cycle.

The final façade glass structure should always be selected according to the engineering and project requirements.

Glass Balustrades and Guardrails

HJ-AT can be used in laminated glass for balconies, staircases and guardrail systems.

For these applications, the complete glass thickness, number of layers and installation method should be confirmed according to the structural and safety requirements of the project.

Glass Canopies

Architectural glass canopies often use laminated glass as part of the finished glazing structure.

HJ-AT provides high transparency together with a higher-flow EVA formulation for processors who need more material movement during production.

Skylights and Roof Glazing

HJ-AT can be considered for laminated skylight and roof glazing structures where clear appearance and outdoor exposure performance are required.

The final glass configuration must be designed according to the loading and safety requirements of the installation.

Complex Laminated Glass Structures

This is one of the areas where HJ-AT's high-flow characteristic can be particularly useful.

When the laminated structure requires more EVA movement during heating, HJ-AT can provide better processing flexibility than a lower-flow grade.

For unusual structures, we recommend producing an actual trial sample before mass production.

Decorative Architectural Laminated Glass

HJ-AT may also be considered for certain architectural decorative glass structures.

If the glass contains mesh, fabric, printed materials or other inserts, compatibility should be checked with the actual material before production.

Different insert materials react differently to temperature and EVA flow.

Multi-Layer Laminated Glass

HJ-AT can also be considered for certain multi-layer laminated structures.

Because multi-layer structures can behave differently from standard two-glass laminates, the complete glass and EVA configuration should be tested before regular production.

HJ-AT VS HJ-HT

Choosing Between High Flow and Lower Flow Extra Clear EVA

HJ-AT and HJ-HT belong to the same Extra Clear architectural EVA family.

Both are designed for clear laminated glass.

The main difference is processing behaviour.

Choose HJ-AT when:

You need more EVA movement during heating.

Your current lower-flow film does not wet or penetrate the structure sufficiently.

Your laminated structure benefits from higher EVA fluidity.

You are processing more demanding or complex glass configurations.

Your production line has been optimized for a higher-flow EVA.

Choose HJ-HT when:

The glass structure does not require high EVA movement.

You prefer more controlled flow during lamination.

Edge control is more important.

Your existing process already works well with a lower-flow product.

IMPORTANT: FLOW SHOULD MATCH THE GLASS STRUCTURE

If too much EVA flows from the glass edge, simply increasing flow is usually not the correct solution.

Likewise, if the EVA does not sufficiently wet the glass or move into the required parts of the laminated structure, simply reducing flow may make processing more difficult.

The correct balance depends on:

Glass thickness

Panel dimensions

EVA thickness

Number of layers

Vacuum performance

Heating temperature

Heating time

Glass structure

Equipment characteristics

This is why E&N HONJIA offers both HJ-AT and HJ-HT rather than one Extra Clear EVA grade for every customer.

AVAILABLE SPECIFICATIONS

Standard HJ-AT Specifications

Standard thickness:

0.38 mm

0.76 mm

Available width:

Up to 2600 mm

Standard roll length:

0.38 mm → 100 m

0.76 mm → 50 m

For other requirements, please send:

EVA thickness

Required width

Required roll length

Glass size

Glass structure

Application

Estimated quantity

We can check the most practical production arrangement before quotation.

PROCESSING SUPPORT

High Flow EVA Needs the Correct Lamination Cycle

HJ-AT moves more readily during heating than a lower-flow EVA.

This means processing conditions should be checked carefully when changing from another EVA grade.

We do not recommend copying one fixed production setting to every furnace or every glass structure.

The correct process depends on:

• Glass dimensions

• Glass thickness

• EVA thickness

• Number of layers

• Vacuum equipment

• Heating equipment

• Loading quantity

• Furnace heating characteristics

1. Glass Cleaning

Glass should be clean and dry before assembly.

Dust, fingerprints, oil, water or other contamination can affect both optical appearance and bonding.

2. EVA Placement

Place the required HJ-AT EVA layer between the glass sheets.

The EVA should remain clean during cutting and assembly.

3. Vacuum

Good air removal is important before and during heating.

Incomplete vacuuming can contribute to air remaining inside the laminated structure.

4. Heating

As the temperature rises, HJ-AT softens and begins to flow.

Because HJ-AT has higher fluidity, heating conditions should be matched to the actual glass structure rather than simply copied from another EVA product.

5. Crosslinking

The correct heating cycle allows the EVA to crosslink after wet-out and bonding.

The target is not simply to make the EVA flow as much as possible.

The objective is to obtain the correct balance between:

Air removal

Wet-out

Flow

Bonding

Crosslinking

WHEN SHOULD YOU CONSIDER HIGH FLOW EVA?

HJ-AT is worth considering if you experience situations such as:

Insufficient Wet-Out

Parts of the glass surface do not laminate as consistently as expected.

Complex Glass Structure

The structure requires the EVA to move more than in a simple flat glass laminate.

Insufficient Penetration Around Suitable Inserts or Details

More EVA movement may help in certain structures.

Compatibility should still be verified with an actual trial.

Existing High-Flow Production Process

If your current production line already uses a high-flow EVA, HJ-AT may be a more direct product to evaluate than changing to a low-flow formulation.

WHAT HIGH FLOW EVA CANNOT FIX BY ITSELF

Changing EVA film does not solve every lamination problem.

For example, bubbles can also result from:

Dirty glass

Moisture

Poor vacuum

Incorrect heating

Too much or too little EVA

Incorrect loading

Uneven furnace temperature

Complex inserts

Incorrect glass preparation

If a customer has a lamination problem, we prefer to review the complete process instead of simply recommending a different film.

PRODUCTION AND QUALITY CONTROL

Consistency for Regular Laminated Glass Production

HJ-AT is checked during production and before shipment according to our product control process.

Key areas include:

Film Thickness

Thickness is checked according to the ordered specification.

Width and Roll Condition

Film width and finished roll condition are checked before packaging.

Appearance

The clear EVA is inspected for visible film defects.

Optical Performance

Key optical properties are evaluated according to the applicable product requirements.

Bonding and Crosslinking

Performance related to glass adhesion and crosslinking is checked according to our product control method.

Packaging

Finished rolls are protected for storage and transportation before shipment.

Carton and pallet arrangements can be provided according to order and shipping requirements.

WHY E&N HONJIA OFFERS DIFFERENT EVA FLOW GRADES

Different glass factories do not produce laminated glass in exactly the same way.

They may use different:

Vacuum systems

Furnaces

Glass thicknesses

Panel dimensions

Heating cycles

Glass structures

Production speeds

For this reason, one EVA flow level cannot suit every factory.

HJ-AT provides a higher-flow option.

HJ-HT provides a more controlled-flow option.

HJ-WA and HJ-WH provide other outdoor clear EVA choices.

HJ-WB is developed for indoor clear laminated glass.

The product should be selected according to how the glass is actually produced and where it will finally be installed.

FAQ

1. What is HJ-AT?

HJ-AT is a high-flow extra clear EVA interlayer developed for laminated glass.

It is designed for processors who need more EVA movement during heating while maintaining high optical clarity.

2. What does high flow mean?

High flow means that the EVA softens and moves more readily during the heating stage of lamination.

This can provide better glass wet-out and more penetration in structures where additional EVA movement is required.

3. Is high flow always better?

No.

High-flow and lower-flow EVA grades serve different processing requirements.

If your structure needs more EVA movement, HJ-AT may be suitable.

If you need tighter edge control and less movement, a lower-flow product may be more appropriate.

4. What is the difference between HJ-AT and HJ-HT?

Both are Extra Clear EVA grades.

HJ-AT has higher flow.

HJ-HT has more controlled flow.

The correct choice depends mainly on the glass structure and production process.

5. What thicknesses are available?

Standard thicknesses are:

0.38 mm

0.76 mm

Other specifications can be discussed according to quantity and production requirements.

6. What is the maximum width?

The current HJ-AT specification is available in widths up to 2600 mm.

Please provide your required width when requesting a quotation.

7. Can HJ-AT be used outdoors?

HJ-AT is developed for architectural laminated glass applications, including appropriate outdoor applications.

Final suitability depends on the complete laminated glass structure, installation and environmental conditions.

8. Can HJ-AT reduce bubbles?

Higher flow can help improve EVA wet-out and penetration under suitable processing conditions.

However, bubbles can also be caused by glass contamination, moisture, insufficient vacuum or incorrect heating.

For this reason, HJ-AT should not be treated as a standalone solution to every bubble problem.

9. Can HJ-AT be used with decorative inserts?

It may be possible depending on the insert material.

Because high-flow EVA can move around inserts differently during heating, we recommend testing the actual insert and glass structure before mass production.

10. Can I get samples?

Yes.

Samples are available for testing.

Tell us:

Required EVA thickness

Glass structure

Application

Current EVA type

This helps us recommend whether HJ-AT or another EVA grade is more suitable for the trial.

11. What is the production lead time?

For standard specifications, normal production lead time is approximately 7–15 working days after the order is confirmed.

Actual lead time depends on quantity, specification and production schedule.

12. Can you help with lamination settings?

Yes.

Please send:

Glass size

Glass thickness

Glass structure

EVA thickness

Vacuum equipment

Heating equipment

Current processing settings

Problem you are experiencing, if any

We can review the production information and provide suggestions for the trial.

NOT SURE WHETHER YOU NEED HIGH FLOW EVA?

Send us your actual production information:

Glass structure

Glass dimensions

Current EVA thickness

Current EVA flow behaviour

Lamination equipment

Application

Any current production problem

We can help you compare HJ-AT with HJ-HT or other E&N HONJIA EVA grades before full production.

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