Introduction

Every sanitary napkin or panty liner placed on a retail shelf contains at least two distinct nonwoven fabric layers. The topsheet — the layer that sits directly against the skin — must be soft, hydrophilic, and capable of rapid fluid transfer. The backsheet or coverstock must be hydrophobic, acting as a leakage barrier. Getting both layers right from a reliable supplier is the single most important raw material decision a feminine hygiene manufacturer makes.

This guide covers the exact nonwoven fabric specifications used in sanitary napkin topsheets and coverstock, the fabric types available, how to evaluate a supplier, and why manufacturers across the UAE, Bangladesh and Saudi Arabia are increasingly sourcing sanitary napkin nonwoven fabric from Pakistan.

For a complete overview of all hygiene-grade nonwoven fabrics we offer, see: Hygiene Nonwoven Fabric — Full Product Range

What Nonwoven Fabrics Are Used in a Sanitary Napkin?

A standard sanitary napkin has three to five layers, each with a distinct material requirement:

Topsheet Fabric — The Most Critical Layer

The topsheet of a sanitary napkin is the most performance-critical nonwoven layer. It must satisfy three competing demands simultaneously: it must feel soft against sensitive skin, allow fluid to pass through rapidly, and resist wet-back so the wearer feels dry between uses.

Hydrophilic Spunbond PP — The Industry Standard

Polypropylene spunbond nonwoven fabric treated with a hydrophilic finish is the dominant topsheet material for mid-range and mass-market sanitary napkins globally. Produced on continuous SSS (triple-beam) spunbond lines, it offers uniform GSM distribution, consistent pore size, and excellent tensile strength for high-speed automated napkin assembly lines.

Key performance parameters buyers should specify:

• GSM: 12–18 GSM for standard napkins; 15–20 GSM for overnight/heavy flow
• Width: typically 35–200 mm for cut-and-place or 800–2,400 mm for jumbo rolls
• Hydrophilic treatment: wetting time under 3 seconds per EDANA WSP 70.3
• Wet-back: less than 0.5 g rewet under standard test conditions
• Tensile strength: minimum 40 N/5cm in machine direction

For adult care products that require the same topsheet softness with higher fluid capacity, 
see: Adult Incontinence Nonwoven Fabric — Supply Guide for Briefs, Pads & Underpads

Hot-Air Through (HAT) Nonwoven — Premium Segment

For premium and ultra-thin sanitary napkins targeting the upper market tier, hot-air through bonded nonwoven fabric — made from bicomponent ES (polyethylene-polypropylene core-sheath) fiber — delivers a significantly softer, more three-dimensional surface texture. The lofted structure creates micro-air channels that maintain surface dryness through the capillary transfer of fluid into the absorbent core.

Hot-air through topsheet fabric is used by leading feminine hygiene brands in their premium SKUs. GSM range: 20–35 GSM. It is more expensive than standard hydrophilic spunbond, but delivers a premium in-use experience that justifies higher retail pricing.

Coverstock & Backsheet Fabric Specifications

The backsheet (underside) of a sanitary napkin requires a hydrophobic nonwoven fabric to prevent any leakage transferring to underwear. Manufacturers typically use a standard hydrophobic spunbond PP in the 18–25 GSM range, optionally combined with a PE breathable film for full barrier protection in overnight pads.

Wing coverstock — used in pads with wing construction — must be soft, flexible, and compatible with hot-melt adhesive systems used on automated napkin assembly lines. This requires a tight spunbond construction in the 15–20 GSM range with consistent caliper (thickness) for adhesive application reliability.

Sanitary Napkin Nonwoven Fabric — Specification Reference

To learn how GSM impacts acquisition speed and rewet performance, 
see: What Is GSM in Nonwoven Fabric?

What to Look for in a Sanitary Napkin Nonwoven Fabric Supplier

Feminine hygiene manufacturers sourcing nonwoven topsheet fabric should evaluate suppliers against five criteria:

1. GSM consistency: roll-to-roll variation must be within ±3% to ensure uniform performance on automated assembly lines. Request roll-level test data, not just batch averages.
2. Width tolerance: slit-to-width accuracy within ±1 mm is critical for cut-and-place assembly. Ask for width tolerance certificates.
3. Hydrophilic treatment durability: treatment must remain effective through the shelf life of the finished napkin (typically 3–5 years). Accelerated ageing test results should be available.
4. Contamination-free supply: topsheet fabric is in direct skin contact. Supplier clean-room storage, sealed PE-film roll packaging, and batch traceability documentation are non-negotiable.
5. MOQ flexibility: early-stage manufacturers need smaller trial runs before committing to container volumes. Shortlist suppliers who offer sample rolls and pilot runs before full production quantities.

Why Source Sanitary Napkin Nonwoven Fabric from Pakistan?

Pakistan-based nonwoven manufacturers — including Olefins Private Limited in Karachi — offer a compelling value proposition for feminine hygiene manufacturers in the GCC, Bangladesh, Africa and Southeast Asia:

• 30–40% cost advantage versus equivalent Chinese or European supply, driven by lower PP raw material costs and competitive labour.
• Karachi port proximity: 7-day sea freight to UAE/GCC; 10–12 days to Bangladesh and East Africa — significantly shorter than China-to-GCC routes.
• Custom GSM and width: OEM production against buyer-provided specifications, with minimum quantities from 1 metric tonne.
• No China tariff exposure: for buyers in markets with trade policy risk on Chinese imports, Pakistani supply offers a geographically diversified sourcing alternative.

Frequently Asked Questions — Sanitary Napkin Nonwoven Fabric

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