What Does Greasy Wool Mean?
Greasy wool is the term used to describe raw wool that has been freshly shorn from a sheep before it has been cleaned, scoured or processed. In its natural state, greasy wool contains lanolin, dirt, sweat salts, vegetable matter and other impurities collected while the sheep has been living outdoors.
For wool merchants, processors and manufacturers, greasy wool is the starting point of the wool supply chain. It is the raw material from which clean wool fibre, wool grease, lanolin and a wide range of textile and industrial products can be produced.
At Standard Wool UK, greasy wool is carefully sourced, handled and prepared for further processing depending on the intended end use.
What Is Found in Greasy Wool?
Freshly shorn wool is very different from the clean, soft fibre many people imagine. Before processing, greasy wool can contain a mixture of natural and environmental materials.
- Natural lanolin, also known as wool grease
- Sweat salts, commonly referred to as suint
- Dust and soil
- Straw and vegetable matter
- Seeds, burrs and other natural debris
- Moisture
- Short fibres and contaminants
The amount of grease and contamination varies depending on the sheep breed, climate, farming conditions, time of year and shearing practices. Some fleeces are naturally heavier in lanolin, while others are drier and may have a higher clean fibre yield after processing.
Why Is Wool Called Greasy?
The word “greasy” refers mainly to lanolin, a natural waxy substance produced by sheep. Lanolin helps protect the animal’s fleece and skin from weather, moisture and environmental conditions.
This natural wool grease plays an important role while the fleece is still on the sheep. It helps repel water, protect the fibre and maintain the quality of the wool before shearing.
Lanolin is also valuable after the wool has been processed. Once extracted during scouring, wool grease can be refined and used in cosmetics, skincare, pharmaceuticals, lubricants and specialist industrial applications.
You can learn more about this material on our dedicated wool grease page.
What Happens to Greasy Wool After Shearing?
After shearing, greasy wool is collected, packed, graded and transported for processing. The next major stage is usually wool scouring, which is the industrial washing process used to remove grease, dirt and other impurities from the fibre.
During scouring, wool passes through a series of washing and rinsing stages. Warm water and specialist detergents help remove lanolin, suint, dust and contaminants. The wool is then dried and prepared for further processing, such as carding, combing, spinning or specialist industrial use.
The British Wool website provides useful information about the wider UK wool industry, sheep farming and wool handling.
Is Greasy Wool Valuable?
Yes, greasy wool can be commercially valuable, but its value depends on several factors. Buyers and processors look at the quality of the fibre, the amount of contamination, the likely clean yield and the intended use of the wool.
Important factors include:
- Fibre quality
- Staple length
- Breed type
- Colour
- Strength
- Moisture level
- Lanolin content
- Clean wool yield after scouring
Greasy wool is usually valued differently from clean, scoured wool because it still contains grease, dirt and moisture. This means the original greasy weight is not the same as the final usable fibre weight after processing.
Greasy Wool vs Scoured Wool
The main difference between greasy wool and scoured wool is that greasy wool is raw and unwashed, while scoured wool has been cleaned and prepared for manufacturing.
| Greasy Wool | Scoured Wool |
|---|---|
| Raw and unwashed | Cleaned and processed |
| Contains lanolin and dirt | Impurities removed |
| Heavier due to grease and contaminants | Lighter clean fibre yield |
| Requires scouring before many uses | Ready for further manufacturing |
| Used at the start of the wool supply chain | Used in textiles, insulation, bedding, felt and other products |
Which Sheep Produce Greasy Wool?
All sheep produce greasy wool, but the characteristics of the fleece vary widely between breeds. Some breeds produce fine, soft wool suitable for clothing and textiles, while others produce stronger, coarser wool often used in carpets, insulation, felt and technical applications.
British sheep breeds associated with commercially useful wool include Bluefaced Leicester, Romney, Suffolk, Texel, Cheviot, Herdwick, Jacob and Welsh Mountain sheep.
The National Sheep Association is a useful external resource for information about sheep farming and the UK sheep sector.
Is Greasy Wool Sustainable?
Greasy wool is a natural, renewable material. Sheep grow a new fleece each year, making wool one of the world’s most established renewable fibres. Once processed correctly, wool can be used in long-lasting products and can also biodegrade under suitable natural conditions.
The grease removed from wool during processing can also be recovered and refined, which helps reduce waste and creates valuable by-products such as lanolin.
As demand grows for natural and lower-impact materials, greasy wool remains an important raw material for textile, agricultural, technical and industrial supply chains.
Greasy Wool Processing in the UK
The UK has a long history of wool production, with British wool recognised for its durability, variety and versatility. Greasy wool plays an essential role in this supply chain because it is the original raw fibre before cleaning, grading and manufacturing.
At Standard Wool UK, we work with wool and wool by-products across a range of commercial and industrial applications, supporting the continued use of British wool in modern manufacturing.
Whether the wool is destined for textiles, insulation, lanolin extraction, bedding, carpets or technical applications, greasy wool is where the journey begins.
Final Thoughts
Greasy wool simply means raw, unwashed wool straight from the sheep. It contains natural lanolin, dirt, suint and other impurities, but it is also a valuable and renewable raw material. Through grading and scouring, greasy wool can be transformed into clean fibre and useful by-products that support a wide range of industries.
To find out more about wool processing, wool grease and commercial wool supply, visit Standard Wool UK.