What special finishes can wool felt have?

There are multiple ways to enhance the qualities of wool felt. Wool felt is a living, complex and extremely adaptable system whose structure and surface allow adjustments and optimisations according to the environment in which it must perform. Like a high performance athlete, natural wool felt possesses exceptional capabilities: resilience, insulation, breathability, resistance, durability. However, its maximum potential emerges when it receives the right training, when the expert manufacturer activates, reinforces or guides the natural architecture of the felt towards specific performances in order to respond to very precise functional demands. How is this achieved? Through special treatments and finishes such as flame resistance, water repellence, antistatic properties, densification, pilling control, colour stability.

What is wool felt?

Wool felt, despite being one of the oldest textiles created by humanity, continues to preserve the sophistication and versatility that keep it relevant, allowing it to continue captivating manufacturers, builders, designers and users. Its almost extraordinary properties give it a high functional flexibility, allowing it to adapt with elegance and character to the most demanding environments: retail spaces, offices, industries, machinery, furniture, fashion accessories, toys, footwear and more. It can even enrich and stimulate the creative processes of designers and artisans across diverse sectors. The key? Knowing how to choose densities, thicknesses, colours and special finishes that reinforce its mechanical, chemical, physical or aesthetic qualities.

• Wool felt made from 100 percent natural wool is a nonwoven material with a uniform appearance, dense body, high resistance and a surprisingly soft touch. It is created through a traditional process combined with the most advanced technologies: the crimped fibres of sheep fleece are consolidated through processes that combine moisture, heat and pressure. Each of these curled fibres has tiny scales similar to those of a fish, allowing them to interlock firmly and durably while also creating an internal structure of interconnected micropores.

To this unique architecture of wool felt is added its own biochemistry, rich in keratin, nitrogen, water, disulfide bonds, proteins. This composition gives it remarkable capabilities to intelligently manage moisture, protect itself against wear, resist fire and recover its shape after deformation, among many other qualities. In addition, wool felt allows functional treatments or finishes that enhance or strengthen its essential properties, refining its performance according to the requirements of each application.

Main treatments and special finishes of wool felt

The special finishes of wool felt can be grouped according to the nature of the treatment applied to the material. They are not always isolated interventions. In many advanced applications, these finishes are strategically combined to optimise specific properties of the felt, extend its functional range or impart essential attributes, depending on the requirements of the sector or project.

• Chemical finishes. These treatments include water repellence, antimicrobial protection, moth resistance and stain resistance. They are processes that respect the flexibility and breathability of the felt, integrating seamlessly into its internal architecture.
• Thermal finishes. These can provide greater shape stability, improve dimensional balance or enhance performance for high temperature technical applications.
• Mechanical finishes. For example, these include processes that densify wool felt, increase its resistance to wear, modify its surface appearance or refine its thickness.

1 Flame resistant finish

Wool felt naturally possesses a notable and intrinsic flame resistant behaviour. However, depending on the density and thickness of the product, it may be necessary to reinforce this behaviour when it must meet strict technical regulations or operate in high risk scenarios. The flame resistant finish gives wool felt exceptional resistance and behaviour when exposed to heat and fire: it does not burn, does not spread flames and self extinguishes once the ignition source is removed. Fire resistance ratings may vary depending on project requirements. For example:

• In the construction sector, products and elements for buildings must comply with the UNE EN 13501 1 standard, which evaluates three basic indicators in textiles: smoke production, contribution to fire and production of flaming droplets or particles. This flame resistant finish makes felt a safe material for interior design and decoration.

Download our catalogues of 100 percent wool felts and felts A 270,

we can manufacture them with the highest fire resistance grade in construction “B s1 d0” according to UNE EN 13501 1, with low smoke production and no flaming droplets or particles. Depending on the application, we can work under ASTM E84, UNE 23727, the French M standard or other sector specific regulations such as those in the automotive industry.

2 Anti pilling finish

Pilling is the formation of those small, annoying and unwanted pills that dull the surface of a textile. It occurs due to the entanglement of short or loose fibres caused by friction. This phenomenon affects both the appearance and the texture of the material, diminishing its elegance and softness. In wool felt, this phenomenon can be controlled either by increasing density or through anti pilling finishes that stabilise its surface, reinforce the cohesion of the outer fibres and prevent them from detaching easily.

• The result? Wool felt that extends its service life, maintains its attractive and refined nature, resists wear and preserves a clean, uniform and elegant appearance even after prolonged use.
• Where is it applied? It is especially valued in decorative applications, luxury packaging and other consumer goods where texture and visual presence are essential.

For example, anti pilling is a valued treatment to maintain the functionality and aesthetics of wool felt used in acoustic absorption elements subject to high foot traffic, bags, accessories, phone cases and other applications exposed to frequent friction and use.

3 Stain resistant treatment

Wool fibres possess a natural wax coating known as lanolin, which acts as a first protective barrier. Thanks to it, wool repels water and offers innate resistance to certain stains. This intrinsic property can be further enhanced through additional treatments such as the stain resistant finish. How is it achieved? After dyeing, techniques are applied that give wool felt a unique finish that repels water and dirt. At the same time it offers long lasting durability and resistance to dry cleaning, without sacrificing the soft touch that characterises this noble and warm material.

• This type of finish is especially appreciated in the manufacture of furniture, decorative panels, fashion accessories and other consumer goods where the felt is exposed to human contact, daily use, constant friction and dust. This ability to remain impeccable gives it both functional and aesthetic value.

4 Water repellent finish

The water repellent treatment gives wool felt greater resistance to liquid water, causing droplets to slide over the surface rather than penetrate the structure. It is not an absolute waterproofing that completely blocks the passage of water. A properly applied water repellent finish respects the felt’s ability to manage water vapour while providing greater resistance to moisture, splashes or occasional contact with liquids. Under prolonged or intense exposure, some moisture may still pass through.

• For example, industrial applications where water repellence is a relevant requirement.

5 Antistatic finish

In certain industrial and technical environments, the accumulation of static electricity can become a silent adversary. Friction or repeated contact between felt and another surface can generate static charges that remain accumulated if not dissipated. The antistatic finish is applied to reduce the accumulation of static charges by facilitating their natural dissipation. How is this achieved? By incorporating conductive agents that create a continuous electrical discharge path, preventing sparks or abrupt discharges. Technical felt with antistatic treatment can be safely used in applications where static electricity could affect equipment and industrial processes. For example, it is used in components of industrial machinery where excess static could create conditions capable of initiating a fire.

6 Anti mould

Although wool has natural resistance to microbial growth, in very humid, enclosed or poorly ventilated environments it may be necessary to reinforce this defence. The anti mould finish acts as a discreet barrier that prevents the deterioration of the material. It can be used in felts intended for industrial environments or in coloured felts for interior design, fashion design, orthopaedics and similar fields.

7 Anti moth

The anti moth treatment protects wool fibres from the discreet and persistent attack of insects that feed on keratin, a protein present both in the outer scaly layer of the fibre and in its inner core. It is a special finish obtained by the controlled incorporation of protective agents that inhibit the activity of these insects. This process helps preserve the structure and beauty of wool felt over time.

• The anti moth finish becomes essential in long lasting applications, in felt pieces intended for prolonged storage or in elements used in domestic environments. For example, it is an ideal treatment for wool felts used in the creation of artistic works.

8 Non slip

There are occasions when friction becomes an ally, a necessary technical resource to provide safety. For this reason, the non slip finish aims to modify the surface of the felt to prevent slipping by incorporating coatings or textures that increase the coefficient of friction.

• For example, natural wool felt desk mats with a non slip backing thanks to a thin latex layer. Natural wool rugs that combine beauty and functionality can also incorporate a non slip surface that allows them to remain flat on the floor without moving, even during children’s play or yoga practice.

The result is a non slip wool felt piece that retains its softness and character.

9 Extra light fastness

There is also a finish that inhibits the fading of wool felt caused by natural light. This treatment is applied in accordance with the UNE EN ISO 105 B02 standard, which determines colour fastness using an artificial light source that simulates the spectrum of solar radiation. In technical terms, this finish improves light fastness by half a point. It is a valuable reinforcement for wool felts used in furniture, curtains or panels exposed to intense natural light over long periods. It therefore acts as a shield to preserve the chromatic intensity of the felt.

10 Custom colour development

Beyond being an aesthetic decision, the dyeing of wool felt allows the material to be chromatically adapted to the identity of a design or brand, enabling it to fully integrate into the space, architecture or moment. For example, at Textil Olius we produced a special piece for the House of Windsor, the 250 square metre carpet used for the final farewell to Queen Elizabeth II of England. We manufactured it from 100 percent natural wool with high density to increase its resistance. In addition, through a complex process, we achieved the elegant, noble and powerful reddish burgundy colour. Our dyeing process is an important part of felt manufacturing. To this end, we have developed a method that adapts perfectly to wool felt and guarantees colour fastness and stability.

• We use the minimum amount of water possible.
• We control the water temperature to prevent any alteration of the dyes.
• We carry out strict chemical control. We meticulously analyse each project and use the minimum possible chemical additives.
• We have our own system for purifying the water released during the process. In this way we close our sustainable cycle.

Our OEKO TEX Standard 100 certification confirms that all our wool felts are free from harmful substances.

11 Densification

Densification is one of the most decisive mechanical finishes for redefining the hardness and rigidity of wool felt. It consists of adjusting the mass through the application of controlled pressure, thereby increasing compaction and performance in specific environments or applications. For example, at Textil Olius we have the technical and technological capacity to manufacture wool felts across a wide range of densities, from 0.13 g per cubic centimetre to 0.5 g per cubic centimetre. A felt with higher density is more resistant, more dimensionally stable and capable of performing in demanding technical applications such as cushioning material, supporting friction or absorbing vibrations.

TEXTIL OLIUS… nearly two centuries shaping wool felt

When its nature is understood, wool felt responds with greater intelligence, resistance and beauty. It is a material that adapts without losing its essence, that adds character without imposing itself, that accompanies spaces without invading them. Its presence is silent and enduring. At Textil Olius, for more than 170 years we have interpreted the language of wool felt. We have deciphered its architecture to bring it to its highest expression. This is why we export to more than 40 countries. Wool felt made from 100 percent natural wool or wool blended with other fibres. We adapt our solutions to the requirements of your project. We also guide you in the selection. Request information.