NICOTINE POUCH FUNDAMENTALS

Understanding Nicotine Pouch Materials and Moisture Stability

The characteristics of a nicotine pouch are determined by more than the ingredients contained within its formulation. The material used to form the pouch, the moisture present in the filling and the way the finished product is packaged all contribute to its physical properties and consistency.

The outer pouch needs to contain the formulation while remaining suitable for its intended use. At the same time, the filling must be developed with the appropriate moisture characteristics, taking into account how ingredients interact and how the product may change during storage.

These considerations are closely connected. Pouch material can influence how moisture moves between the filling and its surroundings, while the formulation and packaging can affect how well the intended product characteristics are maintained over time.

For manufacturers, this means that material selection and moisture management cannot be considered entirely independently. Both need to form part of the wider product development and quality process.

This guide explores the materials used in nicotine pouches, the role of moisture within the formulation and the factors that influence the stability and consistency of the finished product.

Understanding the Pouch Material

The outer material of a nicotine pouch plays an important role in how the finished product is constructed and performs. While the formulation inside the pouch determines many of its characteristics, the surrounding material must contain that formulation while allowing moisture and dissolved ingredients to pass through during use.


Most modern nicotine pouches use a nonwoven fabric, typically made from carefully selected synthetic or plant-derived fibres. Unlike traditional woven textiles, nonwoven materials are manufactured by bonding or entangling fibres together to create a consistent sheet with defined physical properties.


This material is then formed into individual pouches, filled with the prepared formulation and sealed to contain the ingredients.


The choice of material is therefore more than a packaging decision. It forms part of the product specification and can influence the pouch's structure, texture, permeability and overall consistency.

What Is Nonwoven Pouch Material?

What Is Nonwoven Pouch Material?

Nonwoven materials are produced without the conventional weaving or knitting processes used in many textiles. Instead, fibres are arranged into a web and held together through mechanical, thermal or chemical bonding processes. The resulting material can be engineered to achieve different combinations of strength, softness, thickness and permeability.

For nicotine pouch applications, the material needs to provide a suitable balance between containing the filling and allowing the intended interaction with moisture during use.

Different nonwoven constructions can achieve this balance in different ways. As a result, materials that appear similar may have different physical characteristics and behave differently when incorporated into a finished pouch.

Why Material Selection Matters

Why Material Selection Matters

The outer pouch has several functions that need to work together. It must be sufficiently strong to contain the formulation during manufacturing, packaging, storage and intended use. The material also needs to be compatible with the filling process and capable of forming reliable seals.

At the same time, its structure influences how moisture moves through the pouch and how the material feels when used.

These requirements mean that material selection should be considered alongside the formulation, rather than after the filling has already been developed.

A change in pouch material may affect the characteristics of the finished product even when the formulation itself remains unchanged.

From Material Roll to Finished Pouch

From Material Roll to Finished Pouch

During manufacture, nonwoven material is typically supplied in rolls and fed through equipment that forms it into individual pouches.

The prepared formulation is deposited into the material, which is then sealed and separated into finished units. The precise forming and sealing process depends on the equipment and material being used, but the objective is consistent: to produce pouches with defined dimensions, reliable seals and controlled filling quantities.

Material suitability therefore includes not only its properties in the finished product but also how consistently it can be processed during commercial manufacture.

How Pouch Materials Influence the Finished Product

Although the outer material represents only one component of a nicotine pouch, its physical properties can influence several characteristics of the finished product.

Nonwoven materials can be manufactured with different fibre compositions, structures, thicknesses and bonding methods. These differences affect how the material behaves during production and how it interacts with the formulation contained within the pouch.

For manufacturers, selecting an appropriate material involves balancing several requirements rather than focusing on one property in isolation.

Permeability and Moisture Transfer

The structure of a nonwoven material influences how moisture and dissolved ingredients can move through the pouch.


Factors such as fibre arrangement, pore structure and material thickness can affect the rate at which liquid passes through the material. These characteristics need to be considered alongside the formulation and its intended moisture properties.


A material that allows greater moisture transfer is not automatically better suited to every product. The objective is to select a material whose permeability is appropriate for the intended formulation and finished pouch characteristics.

Texture and Material Feel

The texture of the outer material contributes to the physical feel of the finished pouch.

Fibre composition, bonding method, surface structure and material thickness can all influence characteristics such as softness, flexibility and surface texture.
These properties are particularly relevant because the material comes into direct contact with the oral tissues during intended use.

Manufacturers therefore need to consider how the material feels as part of the complete product, rather than assessing its technical characteristics alone.

Mechanical Strength and Durability

Pouch material needs sufficient mechanical strength to withstand the processes involved in manufacturing, packaging and handling.

The material must contain the filling without tearing or losing its intended structure. Its strength and flexibility can also influence how reliably it performs when being formed, filled and processed by manufacturing equipment.

These characteristics are especially important during repeat production, where the material needs to behave consistently across manufacturing runs.

Sealing Performance

The edges of a nicotine pouch must be sealed to retain the formulation within the finished product.

Material composition and construction can influence how effectively a pouch can be sealed using a particular manufacturing process.

Reliable sealing helps maintain the integrity of individual pouches during subsequent handling and storage. The sealing method must therefore be compatible with both the selected material and the manufacturing equipment.

Testing material and seal performance together helps establish whether the chosen combination is suitable for consistent commercial production.

Understanding Moisture in Nicotine Pouches

Moisture is an important component of nicotine pouch formulation, influencing the physical characteristics of the filling and how the finished product behaves during storage and intended use.

Water is incorporated into many nicotine pouch formulations alongside plant-derived fillers, nicotine, flavourings and other functional ingredients. The amount of moisture present, and how it interacts with these ingredients, can influence the consistency, texture and behaviour of the filling.

For manufacturers, moisture management involves more than simply adding a defined quantity of water. It requires an understanding of how moisture is distributed throughout the formulation and how its characteristics may change during production and storage.

The Role of Moisture in the Formulation

Moisture contributes to several characteristics of the finished pouch.

It can influence the softness and cohesion of the filling, helping determine whether the formulation has a relatively dry, granular consistency or a softer, more hydrated texture.

Moisture also interacts with other ingredients. Plant-derived fibres and fillers can absorb and retain water to different degrees, while humectants may be incorporated to help manage moisture retention.

These interactions mean that two formulations containing similar quantities of water may not necessarily have the same physical characteristics.

The overall formulation, rather than water content alone, determines how moisture behaves within the product.

Moisture Content and Moisture Distribution

Moisture content describes the amount of water present within a formulation, usually expressed as a proportion of its total mass.

However, the total quantity of water does not explain how that moisture is distributed or interacts with individual ingredients.

Some water may be more closely associated with the structure of the filling materials, while other water may be more readily available to participate in physical and chemical processes.

This distinction is relevant when developing formulations with specific texture and consistency requirements.

Manufacturers must consider both the quantity of water introduced and the behaviour of that water within the finished formulation.

Understanding Water Activity

A related measurement is water activity (aw), which describes the availability of water within a product rather than its total water content.

Water activity is measured on a scale from 0 to 1 and is used in product stability assessments because water availability can influence microbial growth and certain chemical or physical changes.
Moisture content and water activity are therefore connected, but they are not interchangeable.

Two formulations with similar moisture contents may exhibit different water activity values because of differences in their ingredients and the way those ingredients interact with water.

For manufacturers, this distinction helps explain why assessing moisture solely by its percentage within a formulation may provide an incomplete picture of product stability.

Dry and Moist Pouch Formulations

Nicotine pouches are sometimes described commercially as dry, semi-dry or moist, reflecting differences in their formulation and physical characteristics.

These terms can help distinguish product styles, but they do not represent universally standardised moisture specifications.

A relatively dry formulation may have a firmer or more granular filling, while a more hydrated formulation may have a softer consistency.

However, the finished characteristics also depend on the filler materials, other ingredients and the outer pouch construction.

For product development, a defined moisture specification is therefore more useful than relying solely on broad descriptions such as dry or moist.

Moisture Content vs Water Activity

Both measurements help describe moisture within a nicotine pouch formulation, but they tell us different things about the water present.

Moisture Content

The total amount of water present

Moisture content measures the quantity of water within a formulation, typically expressed as a percentage of its mass. It does not, on its own, describe how that water interacts with the other ingredients.

Measures: Total water quantity

Water Activity (aw)

How available the water is within the formulation

Water activity describes the availability of water within a product. It is relevant to stability assessments because water availability can influence microbial growth and certain chemical and physical changes.

Measures: Water availability

Why the distinction matters: Two nicotine pouch formulations can contain similar amounts of water but have different water activity values. Assessing both can provide a more complete understanding of moisture behaviour during product development and stability testing.

Moisture Content vs Moisture Stability

Establishing the correct moisture content during formulation development is only one part of producing a consistent nicotine pouch.

Manufacturers must also consider how those moisture characteristics may change between production and the end of the product's intended shelf life.

A formulation may meet its moisture specification immediately after manufacture, but this does not necessarily mean it will maintain the same characteristics throughout storage.

Moisture can move between ingredients, migrate through the outer pouch material or be exchanged with the surrounding environment if the packaging allows it. These changes can influence the texture, consistency and physical condition of the finished product.

This introduces an important distinction: moisture content describes the amount of water present at a particular point in time, while moisture stability concerns how consistently the intended moisture characteristics are maintained over time.

Why Initial Moisture Content Is Not Enough

During product development, manufacturers can establish a target moisture content based on the formulation and desired finished product characteristics.

However, meeting this target at the point of manufacture does not guarantee that the product will remain unchanged.

Different ingredients interact with water in different ways. Over time, moisture may redistribute within the filling, potentially changing its physical characteristics even without a substantial change in total water content.

The outer pouch material and finished packaging can also influence how the formulation responds to its storage environment.

For this reason, an initial moisture measurement provides a useful starting point, but it cannot replace an assessment of how the product behaves over time.

How Moisture Changes Can Affect the Finished Pouch

Changes in moisture characteristics may influence several aspects of the finished product.

A reduction in moisture content can affect the softness and cohesion of the filling, potentially resulting in a drier or more granular consistency.

Conversely, increased moisture or changes in its distribution may alter how the filling behaves, including its texture and interaction with the surrounding pouch material.

Moisture changes may also influence the behaviour of other formulation ingredients, making moisture management relevant to the wider stability of the product.

The extent of these effects depends on the formulation, material selection, packaging and storage conditions. They cannot be predicted reliably from moisture content alone.

Maintaining Moisture Characteristics During Storage

Moisture stability is influenced by the interaction between the formulation, pouch material, packaging and external environment.

Packaging plays a particularly important role because it can help limit moisture exchange between the product and its surroundings. However, the effectiveness of that protection depends on the packaging materials, closure integrity and storage conditions.

Manufacturers can assess moisture stability by monitoring relevant product characteristics over time under defined storage conditions.

Depending on the product specification, this may include moisture content, water activity, filling texture, pouch integrity and other physical or chemical properties.

The objective is not necessarily to prevent every measurable change, but to establish whether the finished product remains within its defined and validated specifications throughout its intended shelf life.

What Influences Moisture Stability?

Moisture stability depends on five connected factors — from what goes into the pouch to how it is made and stored.

Moisture
Stability Five factors working together
  • The contents

    Formulation

    Fillers and humectants influence how moisture is retained and distributed.

  • The pouch

    Pouch Material

    Fibre structure and permeability affect how moisture moves through the pouch.

  • The protection

    Packaging

    The packaging barrier and closure help limit moisture exchange with the surrounding air.

  • The environment

    Storage Conditions

    Temperature and humidity influence how moisture levels change over time.

  • The process

    Manufacturing Consistency

    Consistent mixing and filling help maintain even moisture levels across pouches and batches.

It’s a connected system. Each factor contributes to how consistently a pouch maintains its moisture over time.

Testing and Quality Considerations

Selecting suitable pouch materials and establishing the intended moisture characteristics are important stages of nicotine pouch development. However, manufacturers must also verify that these characteristics can be achieved consistently and maintained throughout the product's intended shelf life.

Testing helps establish whether the formulation, pouch material and packaging system perform as expected, while quality controls help minimise unwanted variation during commercial production.

The specific tests required will depend on the product formulation, manufacturing process and defined finished-product specifications.

Material Suitability and Seal Integrity

Pouch materials can be assessed for properties such as strength, thickness, permeability and compatibility with the selected manufacturing process.

Seal integrity is particularly important because the finished pouch must retain its filling during handling, packaging, storage and intended use.

Testing can help identify material or sealing characteristics that may affect the consistency and physical integrity of the finished product.

Moisture Content and Water Activity

Moisture content measurements help manufacturers assess whether the formulation meets its defined water-content specification.

Water activity testing provides additional information about water availability within the product, which may be relevant to its microbiological and physicochemical stability.

Considering both measurements can provide a more complete understanding of the formulation than relying on moisture content alone.

Stability Testing

Stability testing examines how product characteristics change over time under defined storage conditions.

Depending on the product specification, assessments may include moisture content, water activity, filling texture, pouch integrity and other relevant physical or chemical characteristics.

These observations help manufacturers evaluate whether the product remains within its established specifications throughout the proposed shelf life.

Batch-to-Batch Consistency

Quality control also involves checking that manufacturing processes produce consistent results across different production batches.

Variations in ingredient quantities, mixing, filling weights or sealing conditions may affect the characteristics of the finished pouch.

Defined process parameters, in-process checks and finished-product testing help manufacturers identify variation and maintain consistent production standards.

Bringing Material and Moisture Together

The characteristics of a finished nicotine pouch depend on more than its formulation alone. The outer pouch material, moisture properties, packaging and manufacturing process all contribute to how the product performs and maintains its intended characteristics.

Material selection influences the pouch's structure, permeability and physical integrity, while moisture management affects the consistency and behaviour of the filling. These elements must be considered together, as changes to one component can influence the performance of the others.

For manufacturers, the objective is to develop a product with defined, measurable and repeatable characteristics. This involves selecting suitable materials, establishing appropriate formulation specifications and assessing how the finished product behaves during manufacture and storage.

Through controlled production processes and product-specific stability testing, manufacturers can evaluate whether those characteristics remain within their established specifications throughout the intended shelf life.

Ultimately, moisture stability is a property of the complete finished product, rather than a characteristic determined by water content alone. Understanding the relationship between materials, formulation and packaging provides a stronger foundation for consistent nicotine pouch development and commercial manufacture.

Learn More About Nicotine Pouches

Whether you are looking at starting your own nicotine pouch brand and just curious, our Knowledge Hub has the answers you are looking for.

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