Ultra Clear EVA Interlayer

Ultra Clear EVA Interlayer for PDLC Smart Glass Lamination

E&N HONJIA HJ-PL Ultra Clear EVA Interlayer is developed for the production of PDLC laminated smart glass.

Compared with standard laminated glass, PDLC smart glass has an additional functional film inside the glass structure. The EVA interlayer therefore needs to do more than simply bond two pieces of glass together. It must work well with the PDLC film, maintain good optical clarity, and provide stable bonding during vacuum lamination.

HJ-PL is designed for this type of application.

It is normally used on both sides of the PDLC smart film to form a complete laminated glass structure.

Product Features

• Ultra-clear appearance

• Developed for PDLC smart glass lamination

• Good adhesion to glass and PDLC film structures

• Stable performance during vacuum lamination

• Helps reduce bubbles and incomplete bonding

• Suitable for different smart glass sizes

• Available in 0.38 mm and 0.76 mm

• Maximum width up to 2500 mm

• Suitable for customized smart glass production

Specification

Typical Glass Structure with HJ-PL EVA

A common PDLC laminated glass structure is:

Glass / HJ-PL EVA / PDLC Smart Film / HJ-PL EVA / Glass

HJ-PL is normally placed on both sides of the PDLC smart film.

The two EVA layers bond the PDLC film to the outer glass panels during lamination and help encapsulate the functional film inside the finished glass.

Layer 1 – Glass

The outer glass provides the structural strength of the laminated panel.

The glass thickness and type can be selected according to the project, glass size and installation requirements.

Layer 2 – HJ-PL EVA Interlayer

The first HJ-PL EVA layer sits between the glass and the PDLC smart film.

During heating and vacuum lamination, the EVA softens and bonds the materials together.

For smart glass production, clarity and compatibility are especially important because the interlayer sits directly next to the PDLC film.

Layer 3 – PDLC Smart Film

The PDLC smart film is the functional layer of the glass.

It is the part that changes between transparent and privacy states when connected to the electrical system.

The switching function comes from the PDLC film itself, not from the EVA.

Layer 4 – HJ-PL EVA Interlayer

A second HJ-PL EVA layer is placed on the other side of the PDLC film.

Using EVA on both sides helps create a balanced laminated structure and provides bonding between the PDLC film and both glass panels.

Layer 5 – Glass

The second glass panel completes the laminated structure.

After lamination, the glass, EVA and PDLC film become one complete smart glass panel.

Typical Structure

This is the most common structure used for PDLC laminated smart glass.

The actual glass thickness and EVA thickness should still be selected according to the panel size, PDLC film type and processing conditions.

Why HJ-PL EVA Is Used on Both Sides of the PDLC Film

PDLC film cannot simply be placed between two pieces of glass.

It needs an interlayer on both sides to bond the complete structure together.

The usual arrangement is:

Glass → EVA → PDLC → EVA → Glass

This structure helps:

• bond the PDLC film to the glass

• encapsulate the smart film inside the laminated panel

• reduce air pockets and incomplete bonding

• maintain a more stable glass structure

• protect the PDLC film inside the glass

• improve the consistency of the lamination process

For this reason, the EVA interlayer is an important part of PDLC laminated glass production, even though it does not provide the electrical switching function.

HJ-PL EVA and PDLC Smart Film Are Different Materials

HJ-PL EVA and PDLC smart film have completely different functions.

HJ-PL EVA Interlayer

HJ-PL is used for bonding.

Its main job is to connect the glass and PDLC film during lamination and keep the complete structure together after processing.

It does not require electricity.

PDLC Smart Film

PDLC film provides the privacy-switching function.

When connected to the correct power system, the film changes between transparent and privacy states.

So in a complete smart glass panel:

PDLC provides the function.
HJ-PL provides the lamination and bonding.

Both materials are important, but they perform different jobs.

Lamination Process

The production process for PDLC laminated glass is similar to standard EVA laminated glass, but more attention needs to be paid to the position and condition of the PDLC film.

A typical process is:

Glass Cleaning → First Glass → HJ-PL EVA → PDLC Smart Film → HJ-PL EVA → Second Glass → Vacuum Lamination → Finished Smart Glass

1. Clean the Glass

Both glass surfaces should be properly cleaned before assembly.

Dust, oil, fingerprints and other contamination may affect the appearance of the finished laminated glass.

2. Place the First Glass

Lay the first glass panel on a clean working surface.

3. Add the First HJ-PL EVA Layer

Place one layer of HJ-PL EVA on the glass and make sure it is positioned evenly.

4. Place the PDLC Smart Film

Carefully position the PDLC film on top of the EVA.

The film should remain flat and correctly aligned with the glass.

Special care should also be taken with the electrical busbar and wire position.

5. Add the Second HJ-PL EVA Layer

Place another layer of HJ-PL EVA over the PDLC smart film.

6. Cover with the Second Glass

Place the second glass panel on top to complete the structure.

7. Vacuum Lamination

The complete glass assembly is then processed in the vacuum lamination system.

During heating, the EVA softens and bonds the different layers together.

The vacuum process helps remove trapped air from inside the laminated structure.

8. Cooling and Inspection

After lamination and cooling, the finished smart glass should be checked for bubbles, edge bonding, optical appearance and overall lamination quality.

Why Use a Dedicated EVA for PDLC Smart Glass?

Standard laminated glass normally has a simple structure:

Glass / EVA / Glass

PDLC smart glass is more complex:

Glass / EVA / PDLC / EVA / Glass

Because there is an additional functional film inside the glass, the behavior of the EVA during lamination becomes more important.

If the EVA is not suitable for the PDLC structure, common problems may include:

• bubbles

• poor edge bonding

• uneven lamination

• movement of the internal film

• optical defects

• inconsistent production results

HJ-PL is developed for PDLC lamination, so it is better suited to this type of glass structure than using a general EVA film without considering compatibility.

Optical Clarity

Smart glass is usually used in visible architectural applications such as offices, hotels, residential interiors and commercial spaces.

For this reason, the optical appearance of the laminated glass is important.

HJ-PL is formulated as an ultra-clear EVA interlayer so that the bonding layer has minimal visual influence on the finished glass.

The final appearance will still depend on the glass, PDLC film, lamination process and overall glass structure.

Stable Vacuum Lamination

HJ-PL is suitable for vacuum lamination processes commonly used by EVA laminated glass manufacturers.

During production, the EVA needs to soften sufficiently to bond the internal layers while maintaining a stable structure around the PDLC film.

The correct lamination parameters depend on:

• glass thickness

• glass size

• EVA thickness

• PDLC film type

• vacuum equipment

• heating system

• total laminated structure

For new structures or new PDLC films, we recommend testing before full production.

Available Thickness and Size

HJ-PL is available in standard thicknesses of:

0.38 mm
0.76 mm

Maximum width can reach:

2500 mm

Standard roll lengths are:

0.38 mm – 100 m per roll
0.76 mm – 50 m per roll

Different widths and sizes can be discussed according to the customer's glass dimensions and production requirements.

Applications

HJ-PL Ultra Clear EVA is mainly used for the production of laminated PDLC smart glass.

Typical applications include:

Office Partitions

Smart glass can be used in meeting rooms, executive offices and conference spaces where privacy is required only at certain times.

Hotels

Common applications include bathroom partitions, guest room glass and interior privacy glass.

Residential Interiors

Suitable for bathroom glass, partitions, sliding doors and other indoor smart glass applications.

Hospitals and Clinics

PDLC glass can provide privacy for treatment rooms, consultation rooms and other medical spaces without using curtains or blinds.

Commercial Spaces

It can be used in showrooms, VIP rooms, display areas and other commercial interiors.

Customized Smart Glass

HJ-PL can also be used by glass processors producing customized PDLC laminated glass in different sizes and structures.

FAQ

What is HJ-PL Ultra Clear EVA?

HJ-PL is an EVA interlayer developed for PDLC laminated smart glass.

It is used between the glass and PDLC smart film to bond the complete glass structure together during lamination.

Is HJ-PL the same as PDLC smart film?

No.

HJ-PL is the bonding interlayer.

PDLC film is the functional material that provides the electrical privacy-switching effect.

What is the normal PDLC laminated glass structure?

A common structure is:

Glass / HJ-PL EVA / PDLC Smart Film / HJ-PL EVA / Glass

Why are two layers of EVA required?

PDLC film is normally laminated between two glass panels.

One EVA layer is placed on each side of the PDLC film so that both sides can bond to the glass.

What thicknesses are available?

Standard thicknesses are:

0.38 mm and 0.76 mm

The suitable thickness depends on the glass structure and processing requirements.

What is the maximum width?

HJ-PL can be produced up to 2600 mm wide.

Can HJ-PL be used for vacuum lamination?

Yes.

It is suitable for vacuum lamination systems commonly used for EVA laminated glass and PDLC smart glass.

The actual processing parameters should be adjusted according to the glass structure and equipment.

Can I test the material before ordering?

Yes.

Samples can be provided for customers to test the transparency, bonding and compatibility with their own PDLC film and lamination process.

Do you also supply PDLC smart film?

Yes.

E&N HONJIA can supply both HJ-PL EVA Interlayer and PDLC smart film for smart glass production.

What information should I provide for a quotation?

Please provide:

• EVA thickness

• required width

• glass dimensions

• glass thickness

• PDLC film type

• laminated glass structure

• estimated quantity

If available, information about the customer's lamination equipment and current production process is also helpful.

Why Choose E&N HONJIA HJ-PL EVA?

HJ-PL is not positioned as a general EVA film for every type of laminated glass.

It is mainly developed for customers producing PDLC laminated smart glass.

For this application, we focus on the points that glass processors actually care about during production:

• clarity

• bonding

• compatibility with PDLC structures

• stable vacuum lamination

• suitable thickness and width

• consistent production results

Customers can send us their glass size, glass thickness, PDLC film type and laminated structure so we can help confirm a suitable HJ-PL specification before production.