How to recognize real alpaca
Labels, the feel of the fiber, a thread burn test, and acrylic counterfeits you can spot at home
Before we move to washing, it's worth making sure that what you have in your closet is actually alpaca, not a mixture with acrylic sold under that name. This is not purely academic: the washing method for an alpaca-acrylic blend differs from washing 100% alpaca, so misidentifying the material leads directly to the wrong care procedure.
The problem is real because labels are often unclear or purely pictographic, especially when shopping at markets in Peru or Bolivia, where fiber descriptions are abbreviated or missing. Similarly, secondhand items bought on Vinted or OLX often arrive without readable labels at all, because the previous owner cut them out.
Identifying the fiber takes just a few minutes: a label, a feel test, and a simple burn test of a single thread are enough.
Why real alpaca is hard to tell apart from a fake
Acrylic is engineered to mimic the look and softness of wool, so a blend with alpaca can fool even an experienced buyer at first glance. Counterfeits pay off especially in tourist markets, where price and sales volume matter more than reputation.
On top of that, real alpaca comes in two types. Huacaya has dense, crimped fiber resembling sheep's wool, while Suri has long, straight, lustrous hair closer to silk. A buyer unaware of this difference may dismiss a genuine Suri piece as “too shiny, so probably fake,” when that sheen is actually a natural trait of the breed.
Alpaca fiber properties
Standard alpaca: about 26 to 29 microns. Royal and Baby grades: below 23 microns
None, unlike sheep's wool
Medullated, partly hollow inside, which improves thermal insulation at a lower weight
Yes, unlike acrylic
How to test the material at home step by step
- 1
Check the label and composition
Check the percentage of alpaca and the ISO 3758 symbols. The word “wool” alone, without distinguishing the fiber, confirms nothing.
- 2
Assess the feel
Real alpaca is smooth, warm, and slightly springy, without the artificial, slick sheen typical of acrylic.
- 3
Do a thread burn test
Burn a single thread pulled from a hidden seam. Alpaca burns slowly, smells like burnt hair, and leaves a brittle ash. Acrylic melts into a hard bead and smells chemical.
- 4
Consider the price and context of the purchase
A very low price for a declared 100% alpaca item is a warning sign, just like missing information about the fiber's origin.
Burn test safety
Test only a single small thread, never the whole garment. Work over a nonflammable surface, such as a metal bowl, in a well ventilated room, away from children and flammable objects. Keep a way to quickly put out the flame within reach.
Alpaca, sheep's wool, and acrylic: a comparison
Alpaca
Vicugna pacos
The warmest and softest of the three, but needs more careful washing than acrylic.
Sheep's wool
Ovis aries
Telling it apart from alpaca needs the label and a feel check, not the burn test alone.
Acrylic
synthetic fiber
Easy to tell apart from both natural fibers with the burn test.
Common mistakes when identifying alpaca
The most common mistake is judging the fiber purely by how soft it feels at first touch. New acrylic can feel just as pleasant as alpaca, and the difference only shows after a few washes, when the synthetic loses its loft and starts to pill.
The second mistake is treating the term “baby alpaca” as a quality guarantee, when it is actually a trade name for a fiber thickness grade, not proof of the animal's age. The third is trusting a seller because of the market's location, even though fiber composition doesn't depend on where it's sold, only on the actual raw material used.
How to check if it's really alpaca
Do
- Check the percentage composition on the label and ISO 3758 symbols: a bowl with water, iron, a circle with the letter P
- Assess the feel: real alpaca is smooth and soft to the touch, without the artificial, slick sheen of acrylic
- Treat very low price as a warning sign for a product described as 100% alpaca
Don't
- Don't assume that an acrylic blend behaves the same when washing as pure alpaca
- Don't trust a general “wool” description on the label without clear fiber distinction
When to take it to a laundry
If you're still unsure about the composition after checking the label, feel, and burn test, or if your alpaca sweater has a lot of sentimental or financial value to you, it's safer to leave it to a professional laundry instead of risking felting from washing it at home.
Now you know the theory. Practice can be less forgiving.
If you would rather not risk your favourite piece, leave it to the specialists at Gorące Żelazko laundry in Lublin.
Frequently asked questions
No. Alpaca comes from an animal in the camelid family (Vicugna pacos), not a sheep. The fiber differs in structure: alpaca contains no lanolin, has a thinner cuticle, and a more hollow, porous core structure, which translates to different thermal properties and requires different care.
Alpaca is considered hypoallergenic mainly because it contains no lanolin, the main contact allergen in wool, and has a lower prickle factor (itching) than coarse wool. True allergy to keratin protein is rare but possible, so alpaca is not 100% safe for everyone with allergies.
Much less often than regular wool. Itching is a mechanical effect of thick fibers above about 30 microns. Royal and Baby Alpaca grades below about 23 microns rarely cause this and approach the irritation threshold of silk.
Check the percentage composition and ISO 3758 symbols on the label, and assess feel: real alpaca is smooth and soft without the artificial, slick sheen of acrylic. Very low price for claimed 100% alpaca is a warning sign.
Not fully. Both are protein fibers and behave similarly when burned: they burn slowly, smell like burnt hair, and leave a brittle ash. The burn test is great for telling natural fibers apart from acrylic, but alpaca itself has to be told apart from sheep's wool by the label and the absence of lanolin.
About the author
Małgorzata Małecka
Owner of the Gorące Żelazko laundry
Małgorzata Małecka runs the Gorące Żelazko laundry in Lublin. Together with her team, she makes sure customers' clothes, shoes and fabrics come back clean and in the best possible condition.
