How Do You Choose Double Sided Fusible Interlining?

Double Sided Fusible Interlining

Some buyers ask us for an interlining with adhesive on both sides.

What they actually need is often not a traditional interlining at all.

In many garment and textile applications, the product called double sided fusible interlining is a hot melt adhesive web. It is a thin, web-like layer of thermoplastic adhesive placed between two materials.

After heat and pressure are applied, the adhesive melts and bonds both surfaces together.

There is no woven or nonwoven base fabric in the middle. This is what makes it different from ordinary fusible interlining.

For buyers, understanding this difference is important because the adhesive material, bonding temperature, fabric type, washing conditions, and required hand feel all affect the final result.

What Is Double Sided Fusible Interlining?

Double sided fusible interlining, also known as hot melt adhesive web, is made from thermoplastic adhesive formed into a light web structure.

During use, it is placed between two materials:

Fabric A + Hot Melt Adhesive Web + Fabric B

The three layers are then pressed together using heat and pressure.

The adhesive web melts, flows into the surfaces of both materials, and creates a bond after cooling.

Because the adhesive is distributed in an open web structure rather than as a solid film, it can provide bonding while keeping the laminated material relatively soft and breathable.

This product can be supplied in different:

• adhesive materials;
• GSM;
• widths;
• melting ranges;
• bonding strengths;
• roll lengths.

The correct specification depends mainly on what two materials need to be bonded.

Where Is Double Sided Fusible Interlining Used?

The product is useful whenever two textile or flexible material layers need to be joined without conventional sewing or liquid glue.

Typical applications include:

• garment lamination;
• interlining bonding;
• embroidery applications;
• patches and badges;
• shoe materials;
• bags and luggage;
• automotive interior materials;
• home textiles;
• foam and fabric lamination;
• leather and textile bonding;
• composite textile materials.

The application range is broad, but the same adhesive web should not be used for every material.

A web developed for lightweight garment fabric may not be suitable for leather, foam, or a technical textile.

Which Hot Melt Adhesive Material Should You Choose?

This is one of the most important decisions when buying double sided fusible interlining.

UNT supplies hot melt adhesive web in several common materials, including PA, PES, TPU, and EVA.

PA Hot Melt Adhesive Web

PA, or polyamide, is commonly used for textile bonding.

It can provide good bonding strength and is used for many garment, embroidery, leather, and textile lamination applications.

PA is often considered when the finished product needs a reliable bond while maintaining flexibility.

PES Hot Melt Adhesive Web

PES stands for polyester hot melt adhesive.

It is commonly selected for polyester fabrics and other textile applications where wash performance and bonding stability are important.

For garment applications involving polyester-based materials, PES is often one of the first options to test.

TPU Hot Melt Adhesive Web

TPU adhesive web is much more flexible.

It is useful when the laminated material needs to remain soft, elastic, or flexible after bonding.

Typical applications can include:

• stretch fabrics;
• elastic textile laminates;
• functional garments;
• foam bonding;
• flexible composite materials.

When movement and softness matter more than stiffness, TPU is worth testing.

EVA Hot Melt Adhesive Web

EVA is another common thermoplastic adhesive material.

It can be used for various textile and general lamination applications and is often considered when customers need practical bonding at a competitive cost.

Its suitability still depends on the material being bonded and the required washing or heat resistance.

PA, PES, TPU or EVA: What Is the Difference?

Material	Main Character	Typical Requirement	Common Applications
PA	Strong textile bonding with flexibility	General textile bonding	Garments, embroidery, leather, textile laminates
PES	Good compatibility with polyester textiles	Stable textile bonding	Garments and polyester fabric lamination
TPU	Soft and flexible	Stretch and movement	Elastic fabric, foam, functional textiles
EVA	Practical and economical	General bonding	Textile and other lamination applications

This table gives a general direction only.

The final choice should always be confirmed by bonding tests because fabric finishing, coating, surface treatment, and washing requirements can change the result.

Why Use Adhesive Web Instead of Solid Adhesive Film?

Both products can bond two layers, but they behave differently.

A solid hot melt film creates a continuous adhesive layer.

A hot melt adhesive web has an open structure.

For many textile applications, the web structure can help reduce stiffness and maintain more of the original fabric hand feel.

This is particularly useful when the customer wants bonding but does not want the finished laminate to feel like a hard plastic sheet.

However, film may be preferred in applications that need a continuous barrier or a different bonding structure.

The correct choice depends on the finished product.

GSM Is Important, but More Is Not Always Better

Buyers sometimes assume that a heavier adhesive web gives stronger bonding.

That is not always the case.

Increasing adhesive weight may improve bonding in some applications, but too much adhesive can also:

• make the laminate harder;
• increase cost;
• affect breathability;
• cause adhesive penetration;
• change the surface appearance.

For lightweight fabrics, a lower GSM may already provide enough bonding.

Thick, porous, or difficult surfaces may require a different adhesive weight or even a different polymer.

Testing is better than simply choosing the highest GSM.

What Affects Bonding Performance?

Three production settings are especially important.

Temperature

The adhesive needs enough heat to soften and melt.

If the temperature is too low, bonding may remain weak.

If it is too high, the shell fabric may shrink, discolor, flatten, or become damaged.

Pressure

The melted adhesive needs contact with both surfaces.

Insufficient or uneven pressure can lead to weak areas.

Time

The material must remain under the correct conditions long enough for the adhesive to melt and flow.

Temperature, pressure, and time should therefore be tested together.

Changing one setting may require adjustment of the others.

What Should Buyers Test Before Bulk Production?

A small lamination test can prevent much larger problems later.

For double sided fusible interlining, UNT can provide testing according to the customer’s materials and final application.

Important tests include:

Peel Strength

Peel strength is one of the most useful tests for adhesive web.

It measures how strongly the two bonded layers hold together.

Tests can be carried out before and after the required washing or care process.

Bonding Performance

Different temperature, pressure, and time combinations can be checked to identify a suitable bonding condition.

Melting and Activation Temperature

The adhesive needs to activate within a temperature range suitable for the materials being bonded.

This is especially important for heat-sensitive fabrics.

Wash Resistance

For garments and washable textile products, the laminated sample should be washed under the expected conditions.

After washing, check for:

• peeling;
• edge separation;
• bubbling;
• changes in hand feel;
• loss of bonding strength.

Dry-Cleaning Performance

If the finished garment will be dry cleaned, this should also be considered during adhesive selection and testing.

Heat Resistance

For applications exposed to higher temperatures, heat stability can be checked according to the customer’s requirement.

GSM and Width

Adhesive weight and usable width can be measured to ensure that production meets the agreed specification.

Appearance After Bonding

The finished surface should also be checked for adhesive penetration, marks, uneven bonding, or unwanted stiffness.

Common Problems and What They Usually Mean

The Two Layers Peel Apart Easily

Possible causes include:

• wrong adhesive material;
• insufficient temperature;
• insufficient pressure;
• short bonding time;
• too little adhesive;
• difficult fabric surface.

Instead of immediately increasing temperature, the full bonding combination should be checked.

Adhesive Comes Through the Fabric

The adhesive web may be too heavy for the fabric, or the temperature and pressure may be too high.

This is particularly noticeable on thin fabrics.

The Finished Material Becomes Too Hard

The adhesive GSM may be too high, or the selected polymer may not match the required hand feel.

Changing from a solid film to an adhesive web can sometimes help maintain flexibility.

Bonding Is Good Before Washing but Weak Afterwards

The adhesive material may not match the required care conditions.

This is why wash testing should be completed before bulk production.

Questions Buyers Often Ask

Is double sided fusible interlining really an interlining?

In many markets, buyers use this name for hot melt adhesive web. Technically, it is an adhesive bonding material rather than a conventional woven or nonwoven interlining.

Does it have adhesive on both sides?

The web itself is made entirely from hot melt adhesive. When placed between two fabrics, it melts and bonds both sides.

Which material is best for garment bonding?

PA and PES are commonly considered for textile applications, while TPU is useful when greater flexibility is required. The best option should be confirmed by testing.

Can it bond stretch fabric?

Yes. TPU hot melt adhesive web is often considered when the finished laminate needs flexibility or stretch.

Is a higher GSM always stronger?

No. Adhesive type, surface material, temperature, pressure, and time also affect bonding strength.

Can you recommend the bonding temperature?

Yes. A suitable temperature range can be recommended according to the adhesive material, but testing with the customer’s actual fabric is recommended before bulk production.

Why Choose UNT for Double Sided Fusible Interlining?

Hot melt adhesive web is not a product that should be selected only from a GSM list.

The adhesive polymer, web uniformity, melting performance, width, and winding quality all affect how it runs during lamination.

Hot Melt Adhesive Web Production

UNT supports hot melt adhesive web production and quality control from raw material preparation and web formation through weight control, winding, slitting, inspection, and final packing.

Production can be adjusted for different textile and lamination applications.

We support PA, PES, TPU, and EVA hot melt adhesive web with customized specifications.

OEM and ODM Customization

Customization can include:

• adhesive material;
• GSM;
• width;
• roll length;
• melting and bonding requirements;
• hand feel;
• packaging;
• labels;
• core and roll specifications.

OEM and ODM services are available.

Testing Support

For double sided fusible interlining and hot melt adhesive web, UNT can provide testing for:

• peel strength;
• bonding strength;
• melting and activation temperature;
• heat resistance;
• wash resistance;
• dry-cleaning performance;
• GSM;
• width;
• bonding temperature;
• bonding pressure;
• bonding time;
• surface appearance after lamination.

If customers provide both materials that need to be bonded, testing can be carried out to help select a more suitable adhesive type and specification.

Sample and Delivery Time

• Sample preparation: normally within 3 days
• Stock products: normally 3–7 days
• Customized production: normally 7–15 days

Final lead time depends on polymer type, GSM, width, quantity, and customization requirements.

Certification Support

Available certification includes:

OEKO
Certificate No.: SH001 285226

GRS
Certificate No.: BVC-TE-00011147-GRS-2602-50007497-V1.0

Certificate applicability can be confirmed according to the specific adhesive material and product.

Payment Options

Available payment methods include:

• L/C
• D/A
• D/P
• T/T
• Western Union

Shipping and Trade Terms

Orders can be shipped by:

• Sea freight
• Air freight
• International express

Available trade terms include:

• FOB
• EXW
• DAP
• DDP

Competitive Pricing

UNT provides competitive pricing according to adhesive material, GSM, width, roll length, packaging, and order quantity.

For a more accurate recommendation, customers can send us:

• the two materials to be bonded;
• fabric composition;
• required hand feel;
• washing or dry-cleaning requirement;
• current bonding temperature;
• required peel strength;
• target order quantity.

This information helps us select a suitable double sided fusible interlining and prepare samples for bonding tests before bulk production.

Contact Us

Shanghai Uneed Textile Co., Ltd

TEL: +86-21-33608891
FAX: +86-21-33608892
Email: info@uneed-tex.com