When choosing nonwoven fabrics, buyers often focus on one requirement: liquid resistance. However, SMS and laminated nonwoven fabrics work differently, and their failure points are not the same.

The right choice depends on the liquid type, pressure, exposure time, and breathability requirements.

1. Different Barrier Mechanisms

SMS Nonwoven Fabric: Fiber-Based Protection

SMS consists of three layers: spunbond, meltblown, and spunbond. The fine meltblown fibers provide liquid resistance, while the outer spunbond layers offer strength and durability.

Dongguan Hengda Fabric Co., Ltd. offers SMS fabrics ranging from 12 to 80 g/m², without adhesive bonding between layers.

Laminated Nonwoven Fabric: Film-Based Protection

Laminated nonwoven fabric combines a PP nonwoven substrate with a continuous PP or PE film layer.

As long as the film remains intact, it provides an effective barrier against water and oil.

In simple terms, SMS relies on fiber filtration, while laminated nonwoven fabric relies on a continuous film barrier.

2. Different Failure Points

• SMS: More sensitive to liquid pressure and exposure time. Liquids with low surface tension, such as alcohol-containing solutions, may also penetrate more easily.
• Laminated Fabric: More vulnerable to pinholes, creases, physical damage, and delamination between the film and substrate.

SMS tends to experience progressive penetration, while laminated fabric often fails at localized damaged areas.

3. Breathability vs. Liquid Resistance

SMS generally offers better breathability because of its porous fiber structure.

Laminated nonwoven fabric provides a more continuous liquid barrier, but its breathability is significantly reduced.

Choose SMS when breathability and wearing comfort are important. Consider laminated nonwoven fabric when liquid barrier performance is the priority.

4. Four Questions Before Choosing

Before selecting a material, clarify:

1. Liquid type: Water, oil, blood, or solvent-containing liquids?
2. Pressure and time: Short-term contact or continuous pressure?
3. Breathability: Is air permeability required?
4. Testing method: What standards and acceptance criteria will be used?

Hengda Fabric recommends confirming these requirements before sampling. We can provide both SMS and laminated nonwoven samples under the same specifications for comparative testing.

FAQ

Q1: Which material offers both liquid resistance and breathability?

SMS is generally more breathable, while laminated fabric provides a continuous film barrier. The choice depends on application requirements.

Q2: Does one hole make laminated fabric unusable?

Not necessarily. It depends on the location of the damage and whether it affects the required barrier performance.

Q3: Can SMS and laminated fabric share the same test report?

No. Test reports apply to specific samples, structures, test methods, and conditions. New specifications require separate verification.

Need help choosing the right nonwoven fabric?

Contact Dongguan Hengda Fabric Co., Ltd. for material recommendations and sample evaluation.