Spunbond vs SMS Nonwoven Fabric: Which Material Should You Choose?

Introduction

When buying nonwoven fabric for hygiene, medical, protective, or industrial applications, the comparison between spunbond vs SMS is important because these two materials have fundamentally different structures.

Spunbond is generally a single-layer nonwoven fabric made from continuous filaments.

SMS is a multilayer composite nonwoven consisting of:

Spunbond + Meltblown + Spunbond

The difference may look simple, but it creates significant differences in performance.

Spunbond is commonly selected when buyers need:

• Good tensile strength

• Lightweight construction

• Air permeability

• Cost efficiency

• Dimensional stability

• Easy converting

SMS is generally selected when the product requires a combination of:

• Strength

• Fine-fiber barrier performance

• Liquid resistance

• Particle protection

• Breathability

• Structural stability

Therefore, asking whether spunbond or SMS is "better" is not the right approach.

The better question is:

Which material provides the required finished-product performance at an acceptable total cost?

This guide compares spunbond vs SMS nonwoven fabric in terms of structure, manufacturing process, strength, barrier properties, breathability, liquid resistance, applications, cost, and procurement requirements.

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What Is Spunbond Nonwoven Fabric?

Spunbond nonwoven fabric is manufactured by extruding a thermoplastic polymer into continuous filaments, drawing the filaments, forming them into a web, and bonding the web.

Polypropylene (PP) is one of the most common materials used for spunbond production.

A simplified manufacturing process is:

PP Resin → Extrusion → Filament Spinning → Cooling → Drawing → Web Formation → Thermal Bonding → Winding

The resulting material is generally a single-layer nonwoven structure.

Spunbond can be manufactured in different:

• GSM

• Widths

• Colors

• Softness levels

• Surface treatments

• Hydrophilic grades

• Hydrophobic grades

• UV-stabilized grades

• Laminated structures

Typical applications include:

• Nonwoven bags

• Agricultural covers

• Furniture materials

• Mattress materials

• Hygiene products

• Medical products

• Packaging

• Protective covers

• Construction materials

The major advantage of spunbond is its balance between strength, production efficiency, versatility, and cost.

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What Is SMS Nonwoven Fabric?

SMS stands for:

Spunbond + Meltblown + Spunbond

A simplified SMS structure looks like this:

S | M | S

where:

• S = Spunbond layer

• M = Meltblown layer

• S = Spunbond layer

The outer spunbond layers generally provide mechanical strength and structural support.

The middle meltblown layer consists of much finer fibers and contributes to:

• Barrier performance

• Fine-pore structure

• Particle filtration

• Liquid resistance

• Functional protection

This combination allows SMS to perform functions that a conventional single-layer spunbond fabric may not provide as effectively.

SMS is commonly used in:

• Medical gowns

• Surgical products

• Protective clothing

• Hygiene products

• Medical packaging

• Barrier materials

• Filtration-related applications

The exact performance depends on the number of layers, GSM distribution, fiber structure, bonding, and finishing.

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Spunbond vs SMS: The Main Difference

The most important difference is structural.

Spunbond is normally a single spunbond layer.

SMS combines two spunbond layers with a meltblown middle layer.

Property	Spunbond	SMS
Structure	Single-layer spunbond	Spunbond + Meltblown + Spunbond
Number of functional layers	Usually one	Three
Main fiber structure	Continuous filaments	Continuous filaments + fine fibers
Mechanical strength	Generally good	Generally good
Barrier performance	Limited to moderate depending on structure/treatment	Generally higher
Liquid resistance	Treatment-dependent	Generally better potential
Filtration potential	Limited to moderate	Higher
Air permeability	Generally good	Application-dependent
Breathability	Good	Good when properly engineered
Cost	Generally lower	Generally higher
Production complexity	Lower	Higher
Typical application	Structural fabric	Barrier/protective fabric

The table shows why SMS should not simply be considered a "stronger spunbond."

It is a different material structure designed to provide additional functionality.

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How Is Spunbond Manufactured?

Spunbond production begins with polymer resin.

Step 1: Polymer Feeding

PP resin is fed into the extruder.

Step 2: Melting

The polymer is heated to create a controlled molten stream.

Step 3: Filament Formation

The molten polymer is extruded through spinnerets to create continuous filaments.

Step 4: Cooling and Drawing

The filaments are cooled and drawn to develop the desired orientation and physical properties.

Step 5: Web Formation

The continuous filaments are distributed into a web.

Step 6: Thermal Bonding

The web is bonded using heat and pressure.

Step 7: Winding

The finished fabric is slit and wound into rolls.

The result is a relatively simple and efficient nonwoven structure.

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How Is SMS Manufactured?

SMS production combines two different nonwoven technologies.

The process can be simplified as:

Spunbond Formation → Meltblown Formation → Spunbond Formation → Composite Bonding → Winding

The exact equipment configuration varies by production line.

Spunbond Layers

The spunbond layers provide the structural framework.

They contribute:

• Tensile strength

• Tear resistance

• Dimensional stability

• Handling strength

Meltblown Layer

The meltblown layer is produced by attenuating molten polymer into very fine fibers using high-velocity hot air.

These fine fibers create:

• High surface area

• Fine pore structures

• Filtration potential

• Barrier-related functionality

Composite Formation

The spunbond and meltblown layers are combined into the SMS structure.

The final material is then wound into rolls according to customer requirements.

This additional production complexity is one reason SMS generally costs more than ordinary spunbond.

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Why Does SMS Have Better Barrier Performance?

The key is the meltblown middle layer.

Spunbond generally uses relatively larger continuous filaments.

Meltblown uses much finer fibers.

The fine-fiber meltblown layer creates a more complex and smaller-pore structure.

This can increase resistance to:

• Liquid penetration

• Fine particles

• Aerosol movement

• Contaminant transfer

However, barrier performance is not determined only by the presence of a meltblown layer.

It also depends on:

• Fiber diameter

• GSM

• Meltblown layer weight

• Pore structure

• Bonding

• Surface treatment

• Hydrostatic pressure

• Liquid characteristics

Therefore, buyers should request actual test data instead of assuming that every SMS fabric provides the same barrier performance.

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Spunbond vs SMS: Which Is Stronger?

Spunbond has good mechanical strength because of its continuous filament structure.

SMS also contains spunbond layers, so it can maintain good mechanical performance while adding a meltblown functional layer.

However, SMS is not automatically stronger simply because it contains three layers.

Its primary advantage is functional balance, not necessarily maximum tensile strength.

For example:

Requirement	More Appropriate Starting Point
Maximum structural efficiency	Spunbond
Basic tensile strength	Spunbond
Strength + barrier	SMS
Strength + filtration	SMS
Strength + liquid resistance	SMS

If the application only requires structural strength, using SMS may add unnecessary cost.

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Spunbond vs SMS: Barrier Performance

This is one of the most important differences.

Standard spunbond can provide some resistance to liquid penetration depending on:

• GSM

• Fabric density

• Surface treatment

• Polymer

• Bonding

• Pressure

However, SMS adds a meltblown layer that can create a finer internal structure.

This can improve the overall barrier system.

For products requiring protection against:

• Fine particles

• Liquid droplets

• Splashes

• Contamination

SMS can therefore be a more appropriate starting point.

But "SMS" itself should not be treated as a universal performance guarantee.

Two SMS products can have different barrier performance because their meltblown layer and overall construction may be different.

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Spunbond vs SMS: Liquid Resistance

Liquid resistance is particularly important for medical and protective products.

A standard untreated PP spunbond fabric is naturally hydrophobic.

However, its liquid resistance depends on the fabric structure.

SMS adds the meltblown layer, which can provide additional resistance to liquid penetration.

A simplified concept is:

Spunbond → Structural layer

Meltblown → Fine-pore functional layer

Spunbond → Structural/protective layer

The actual liquid resistance depends on the finished structure and test conditions.

Important variables include:

• Hydrostatic pressure

• Liquid surface tension

• Fabric GSM

• Thickness

• Pore structure

• Surface treatment

• Pressure and exposure time

Therefore, a buyer should specify a required liquid-resistance test rather than simply requesting "waterproof SMS."

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Spunbond vs SMS: Breathability

One common misunderstanding is:

"If SMS has a barrier layer, it must be less breathable."

Not necessarily.

SMS can be engineered to provide a balance between barrier performance and air permeability.

However, there is usually a trade-off.

Increasing barrier performance can affect:

• Airflow

• Pressure drop

• Moisture vapor transmission

• Comfort

The optimal structure depends on the final product.

For protective clothing, for example, the material may need:

Barrier + Breathability + Comfort

rather than maximum barrier performance alone.

This is why SMS construction needs to be optimized according to the application.

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Spunbond vs SMS: Filtration

The meltblown layer gives SMS an important advantage in filtration-related applications.

The fine fibers provide greater surface area and a fine pore structure.

Filtration performance can involve:

• Particle interception

• Inertial impaction

• Diffusion

• Electrostatic attraction

When the meltblown layer is appropriately engineered, SMS can provide substantially different filtration behavior from ordinary spunbond.

However, filtration performance should be verified using actual test data.

Important parameters can include:

• Particle filtration efficiency

• Airflow

• Pressure drop

• Fiber diameter

• GSM

• Electrostatic treatment

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Spunbond vs SMS for Medical Gowns

Medical gowns are a classic example of where SMS can have an advantage.

A gown may need:

• Strength

• Lightweight construction

• Breathability

• Liquid resistance

• Barrier performance

• Comfort

Ordinary spunbond can provide strength and breathability, but the required barrier performance may be difficult to achieve without additional treatment or lamination.

SMS can combine:

Spunbond strength + meltblown barrier functionality

This makes SMS a common material choice for various disposable protective products.

The exact material should still be selected according to the required protection level and applicable product standards.

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Spunbond vs SMS for Surgical and Medical Products

Medical products can have very different requirements.

For example:

A simple protective cover may primarily require:

• Strength

• Breathability

• Low cost

A liquid-resistant medical gown may additionally require:

• Liquid resistance

• Barrier performance

• Particle protection

The first application may be adequately served by spunbond.

The second may require SMS or another multilayer structure.

Therefore, material selection should begin with the risk and performance requirements of the finished product.

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Spunbond vs SMS for Hygiene Products

Both spunbond and SMS can be used in hygiene-product manufacturing.

Spunbond can be used for:

• Topsheets

• Backing layers

• Distribution layers

• Structural layers

• External surfaces

SMS may be selected when additional:

• Barrier protection

• Liquid resistance

• Filtration

• Fine-fiber functionality

is required.

The actual material depends on the product architecture.

For example, a diaper component designed primarily for softness and liquid transfer may require a different structure from a protective hygiene layer.

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Spunbond vs SMS for Face Masks

Face masks illustrate another important difference.

Spunbond can be used as:

• Outer layer

• Inner layer

• Support layer

Meltblown is commonly used as a filtration layer.

SMS combines both technologies into one composite material.

However, an SMS roll should not automatically be assumed to be suitable for every mask.

Mask performance depends on:

• Filtration efficiency

• Breathability

• Pressure drop

• Layer construction

• Electrostatic treatment

• Product design

• Applicable testing requirements

Therefore, mask manufacturers should purchase material based on verified specifications rather than only the term "SMS."

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Spunbond vs SMS for Protective Clothing

Protective clothing often requires a combination of properties.

A material may need to:

• Resist liquid penetration

• Reduce particle penetration

• Remain breathable

• Maintain tensile strength

• Survive sewing

• Remain comfortable during use

This is where SMS can provide a useful performance balance.

The outer spunbond layers can provide structural integrity.

The meltblown layer can provide additional barrier and filtration functionality.

For higher protection requirements, other constructions such as laminated nonwovens may also be considered.

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Spunbond vs SMS: Softness

Spunbond can be manufactured with different levels of softness.

The result depends on:

• Fiber characteristics

• Bonding pattern

• GSM

• Production conditions

• Finishing

SMS can also be engineered for comfort.

However, adding a meltblown layer does not automatically make SMS softer than spunbond.

For products that contact skin, buyers should evaluate:

• Hand feel

• Surface smoothness

• Flexibility

• Drape

• Bending stiffness

• Skin-contact performance

Actual samples are often more useful than specifications alone.

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Spunbond vs SMS: Thickness

Thickness depends on:

• GSM

• Fiber diameter

• Layer structure

• Web density

• Bonding

• Compression

• Production conditions

SMS generally has a more complex multilayer structure than single-layer spunbond.

However, thicker does not necessarily mean better barrier performance.

A well-designed fine-fiber layer can provide significant functionality without simply making the material extremely thick.

Therefore, buyers should evaluate:

GSM + thickness + barrier performance + air permeability

together.

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Spunbond vs SMS: GSM

GSM is one of the most common purchasing specifications.

However, buyers should remember:

GSM is not a performance specification by itself.

For example:

40 GSM spunbond

and

40 GSM SMS

are not equivalent materials.

The SMS product contains multiple functional layers, while the spunbond product consists primarily of one spunbond structure.

Two materials with the same GSM can therefore have different:

• Tensile strength

• Thickness

• Air permeability

• Liquid resistance

• Filtration

• Barrier performance

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Spunbond vs SMS: Cost

Spunbond is generally cheaper when the application only requires a basic structural nonwoven fabric.

SMS requires:

• Additional meltblown production

• More complex equipment

• More process control

• Additional polymer processing

• Multilayer construction

Therefore, SMS generally has a higher production cost.

However, the correct question is not:

"Which fabric has the lower price per kg?"

The better question is:

"Does the additional SMS cost eliminate the need for other barrier or filtration materials?"

For example, if a protective product requires a barrier layer anyway, using an appropriate SMS structure may reduce the need for additional processing or materials.

This can change the total product economics.

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Cost per Square Meter

For B2B buyers, cost per square meter can be more useful than price per kilogram.

A simple calculation is:

Cost per m² = GSM ÷ 1000 × Price per kg

For example:

• GSM = 50 g/m²

• Price = $1.60/kg

Then:

50 ÷ 1000 × $1.60 = $0.08/m²

However, buyers should compare materials based on the performance they provide.

An SMS fabric may cost more per kilogram but provide barrier performance that a cheaper spunbond cannot achieve.

Therefore, total cost should consider:

• Fabric cost

• Additional coatings

• Lamination

• Converting

• Rejection rate

• Finished-product performance

• Production efficiency

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Spunbond vs SMS: Which Should You Choose?

Use spunbond when the main requirements are:

• Good strength

• Lightweight construction

• Low cost

• Good air permeability

• Dimensional stability

• Easy converting

• High-volume production

Typical applications include:

• Shopping bags

• Agricultural covers

• Furniture materials

• Mattress materials

• Basic hygiene layers

• Packaging

• Structural components

Choose SMS when the application additionally requires:

• Better barrier performance

• Liquid resistance

• Fine-particle protection

• Filtration functionality

• Protective clothing performance

• Multilayer functionality

Typical applications include:

• Medical gowns

• Protective clothing

• Surgical products

• Hygiene barrier layers

• Medical packaging

• Filtration-related structures

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Spunbond vs SMS Decision Matrix

Requirement	Spunbond	SMS
Low material cost	★★★★★	★★★
Basic structural strength	★★★★★	★★★★
Lightweight construction	★★★★★	★★★★
Air permeability	★★★★★	★★★★
Barrier performance	★★	★★★★★
Liquid resistance	★★	★★★★★
Particle protection	★★	★★★★
Filtration potential	★★	★★★★
Medical protective clothing	★★★	★★★★★
Agricultural cover	★★★★★	★
Nonwoven shopping bags	★★★★★	★
Furniture backing	★★★★★	★
Protective clothing	★★★	★★★★★
Multilayer functionality	★	★★★★★
Production simplicity	★★★★★	★★★

The ratings are practical comparisons rather than universal technical specifications.

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Spunbond vs SMS: What Should Buyers Specify?

A professional RFQ should contain more than:

"Please quote SMS fabric."

For spunbond, buyers may specify:

Specification	Example
Material	PP spunbond
GSM	50 GSM
Width	160 cm
Color	White
Treatment	Hydrophobic
MD tensile	Required value
CD tensile	Required value
Elongation	Required value
Air permeability	Required value
Roll length	Required length
Application	Agricultural cover

For SMS, buyers may need additional specifications:

Specification	Why It Matters
Total GSM	Overall material weight
S/M/S structure	Defines layer construction
Meltblown GSM	Determines functional layer weight
MD/CD tensile	Mechanical performance
Hydrostatic pressure	Liquid resistance
Air permeability	Breathability
Filtration efficiency	Particle capture
Thickness	Physical structure
Roll width	Converting compatibility
Roll length	Production planning
Surface treatment	Functional performance
Color	Product appearance

The exact specifications should be determined by the finished product.

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Should You Buy Spunbond or SMS for Your Product?

Use this five-step process.

Step 1: Identify the Main Function

Ask:

What does the fabric actually need to do?

Is it mainly:

• Structural?

• Protective?

• Absorbent?

• Filtration-related?

• Liquid-resistant?

• Breathable?

Step 2: Identify the Critical Property

Choose the most important performance requirement.

For example:

Bag → Tensile strength

Agricultural cover → Strength + UV resistance + air permeability

Medical gown → Barrier + liquid resistance + strength + breathability

Filter → Filtration efficiency + pressure drop

Step 3: Compare Material Structures

Do not compare only GSM.

Compare:

• Fiber structure

• Layer structure

• Thickness

• Tensile

• Air permeability

• Barrier performance

• Liquid resistance

Step 4: Test Samples

Run the material through the actual converting process.

Check:

• Cutting

• Sewing

• Heat sealing

• Printing

• Lamination

• Folding

• Final assembly

Step 5: Compare Total Cost

Calculate the actual cost of producing the finished product.

The cheapest fabric is not always the cheapest solution.

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Common Mistakes When Comparing Spunbond and SMS

Mistake 1: Assuming SMS Is Always Better

SMS provides additional functionality, but that functionality comes with additional cost.

If you only need a structural fabric, ordinary spunbond may be the better commercial choice.

Mistake 2: Comparing Only GSM

Equal GSM does not mean equal performance.

The layer structure and fiber structure are fundamentally different.

Mistake 3: Assuming All SMS Has the Same Barrier Performance

SMS is a material structure, not a single standardized performance level.

Different meltblown GSM, fiber diameter, pore structures, and processing conditions can produce different results.

Mistake 4: Ignoring Air Permeability

Increasing barrier performance can affect airflow and comfort.

Protective clothing often requires a balance between protection and breathability.

Mistake 5: Buying Based Only on Price per Kilogram

A higher-priced SMS product may eliminate the need for additional coating or lamination.

The finished-product cost is more important than fabric price alone.

Mistake 6: Assuming Three Layers Automatically Mean Higher Strength

The primary reason for SMS is functional integration.

The meltblown layer is mainly there to provide fine-fiber functionality, not simply to increase tensile strength.

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Spunbond vs SMS: Quick Selection Guide

If your product needs:

Low cost + good strength → Spunbond

Agricultural cover → Spunbond

Nonwoven shopping bag → Spunbond

Furniture backing → Spunbond

Basic structural hygiene layer → Spunbond

Strength + barrier → SMS

Liquid resistance + breathability → SMS

Medical protective gown → SMS

Particle protection + strength → SMS

Multilayer protective material → SMS

The final selection should always be based on actual product requirements and verified testing.

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Final Takeaway

The key difference in spunbond vs SMS is the material structure.

Spunbond is generally a single-layer continuous-filament nonwoven designed primarily for:

Strength + structure + cost efficiency

SMS combines:

Spunbond + Meltblown + Spunbond

to provide a broader combination of:

Strength + barrier + filtration + liquid resistance

This makes spunbond a strong choice for applications such as:

• Bags

• Agriculture

• Furniture

• Mattresses

• Packaging

• Structural materials

SMS is generally more appropriate when the finished product requires additional protection, such as:

• Medical gowns

• Protective clothing

• Hygiene barrier layers

• Medical products

• Filtration-related applications

The most important purchasing principle is:

Do not pay for SMS functionality if your product does not need it.

At the same time:

Do not choose ordinary spunbond simply because it is cheaper if your product requires barrier or filtration performance.

The right decision comes from matching the material structure to the finished-product requirements.

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FAQ

What is the difference between spunbond and SMS?

Spunbond is generally a single-layer nonwoven made from continuous filaments. SMS consists of three functional layers: spunbond, meltblown, and spunbond.

Is SMS stronger than spunbond?

Not necessarily. SMS contains spunbond layers and can provide good mechanical strength, but its main advantage is the combination of structural strength with barrier and fine-fiber functionality.

Why is meltblown used in SMS?

Meltblown provides very fine fibers and a fine-pore structure. This can improve filtration, liquid resistance, and barrier-related performance.

Is SMS waterproof?

SMS can provide significantly better liquid resistance than many standard spunbond structures, but SMS should not automatically be described as completely waterproof. Actual water resistance depends on GSM, pore structure, treatment, hydrostatic pressure, and product design.

Is SMS more expensive than spunbond?

Generally, yes. SMS requires additional meltblown production and multilayer processing. However, the additional cost may be justified when barrier or filtration performance is required.

Which is better for medical gowns, spunbond or SMS?

SMS is often a more appropriate starting point when the gown requires a combination of strength, breathability, and liquid or particle barrier performance.

Can spunbond be used for medical products?

Yes. Spunbond is used in many medical and hygiene applications. However, whether it is sufficient depends on the required protection level.

Which is better for agricultural fabric?

Spunbond is generally the more practical choice for agricultural covers because strength, air permeability, lightweight construction, UV stabilization, and cost efficiency are often more important than multilayer barrier performance.

Which is better for nonwoven bags?

Spunbond is generally the better choice because nonwoven bags primarily require strength, durability, printability, sewing compatibility, and cost efficiency.

Is SMS the same as SSMMS?

No. SMS has a basic Spunbond-Meltblown-Spunbond structure. SSMMS contains additional spunbond and meltblown layers and can be engineered for different performance requirements.

Does higher GSM always mean better SMS?

No. Total GSM is only one parameter. The distribution of GSM between spunbond and meltblown layers, fiber diameter, pore structure, bonding, and finishing can all affect performance.

Does SMS have good air permeability?

It can. SMS can be engineered to balance barrier performance and breathability. However, increasing barrier performance may affect airflow, so actual air-permeability and pressure-drop data should be evaluated.

Should I choose spunbond or SMS?

Choose spunbond when strength, lightweight construction, simplicity, and cost efficiency are the main priorities. Choose SMS when your product additionally requires stronger barrier, liquid-resistance, filtration, or protective performance.