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Polypropylene vs Nylon Sutures
Polypropylene and nylon (polyamide) are the two most widely used non-absorbable monofilament sutures. Both are smooth, low-reactivity strands that stay in tissue, but they differ in how stable they are over time, in how they handle and knot, and in the procedures where each is usually chosen.
Why it matters
Because both are clear-cut non-absorbable monofilaments, the two are often treated as interchangeable. They are not quite: polypropylene is effectively unchanged in tissue, while nylon slowly loses strength over a long period, and their physical behaviour — plasticity against elasticity — changes how each handles and holds a knot. Those differences explain why one dominates vascular work and the other skin closure.
Two non-absorbable monofilaments
Polypropylene is a polyolefin; nylon is a polyamide. Both are extruded as smooth monofilaments, both provoke minimal tissue reaction, and both are classed as non-absorbable, so they remain in tissue unless removed. Nylon is also made in braided form, but in surgical practice the comparison that matters is between the two monofilaments.
Each material has its own article — polypropylene sutures and polyamide (nylon) sutures. This page sets them side by side.
Stability in tissue
The clearest difference is long-term stability. Polypropylene is not degraded in tissue and keeps its strength indefinitely, which is why it is used where support must last — vascular anastomoses and fixation that must never let go.
Nylon is non-absorbable but not entirely inert over time: it is slowly hydrolysed and loses tensile strength gradually over a long period. For skin closure, where the suture is removed after healing, this has no practical consequence; for a buried suture expected to hold for years, it is a reason to prefer polypropylene. The general distinction is explained in absorbable vs non-absorbable sutures.
Plasticity and elasticity
Polypropylene is plastic: under tension it deforms and tends to keep its new shape, so a knot flattens and settles as it is tightened. It is very smooth and slides easily, which helps when a suture is drawn through tissue or a continuous line is adjusted.
Nylon is more elastic: it stretches under load and recovers, giving a springier strand. Both materials have memory and a smooth surface, so both need deliberate knot technique — enough throws, laid square — to hold securely. That is covered in what makes a surgical knot hold.
Where each is typically used
Polypropylene’s stability, smoothness and low thrombogenicity make it the usual choice for vascular and cardiac suturing, and it is widely used for hernia repair and mesh fixation, as well as for skin — including subcuticular pull-out sutures, which its slipperiness makes easy to remove.
Nylon is very commonly used for interrupted skin closure, where its handling and strength suit sutures that will be removed, and in fine sizes for microsurgical and ophthalmic work. Approved indications for a particular product are defined in its instructions for use and vary by market.
Colour and visibility
Both materials are usually supplied dyed so that they stand out against tissue — polypropylene commonly blue and nylon commonly black; the colour of a given product is stated on its label. Colour carries no clinical difference in itself, but it affects how easily the suture is seen during placement and, in the skin, at removal.
Key terminology
- Polypropylene
- A polyolefin monofilament suture that is not degraded in tissue and keeps its strength indefinitely.
- Polyamide (nylon)
- A non-absorbable suture, usually monofilament, that loses tensile strength slowly in tissue over a long period.
- Plasticity
- The tendency of a material to deform under load and keep its new shape; characteristic of polypropylene.
- Elasticity
- The tendency of a material to stretch under load and recover; more characteristic of nylon.
- Memory
- A strand’s tendency to return to its packaged shape, which affects handling and knotting.
- Thrombogenicity
- The tendency of a material to promote clot formation; low for polypropylene, which suits vascular use.
- Pull-out suture
- A subcuticular suture designed to be withdrawn in one piece once the wound has healed.
Technical characteristics
- Polymer
- Polypropylene: polyolefin · Nylon: polyamide
- Construction
- Both monofilament (nylon also available braided)
- Absorption
- Neither is absorbed
- Long-term strength
- Polypropylene: maintained indefinitely · Nylon: declines slowly over a long period
- Physical behaviour
- Polypropylene: plastic · Nylon: elastic
- Tissue reaction
- Minimal for both
- Usual colour
- Polypropylene: commonly blue · Nylon: commonly black
- Dolphin Sutures equivalents
- Duracare (polypropylene) · Linex (nylon)
How it compares
| Attribute | Polypropylene | Nylon (polyamide) |
|---|---|---|
| Stability in tissue | Not degraded; strength maintained | Slow loss of strength over a long period |
| Physical behaviour | Plastic; deforms and holds shape | Elastic; stretches and recovers |
| Surface | Very smooth, low drag | Smooth, low drag |
| Knot handling | Needs careful throws; knots settle | Needs careful throws; springier |
| Typical uses | Vascular, cardiac, hernia, mesh fixation, skin | Interrupted skin closure, microsurgery, ophthalmic |
| Dolphin Sutures equivalent | Duracare | Linex |
What clinicians weigh when selecting
How long support must last
Where a buried suture must hold for years, polypropylene’s stability is preferred; for removed skin sutures, nylon’s slow strength loss does not matter.
Vascular and cardiac work
Polypropylene’s smoothness and low thrombogenicity make it the usual choice for anastomoses.
Knot security
Both are smooth monofilaments with memory; adequate throws and correct technique are essential with either.
Skin closure and removal
Nylon is a common choice for interrupted skin sutures; polypropylene’s slipperiness suits subcuticular pull-out closure.
Visibility
Dyed blue or black, both stand out against tissue; colour is about visibility, not performance.
Frequently asked questions
What is the difference between polypropylene and nylon sutures?
Both are non-absorbable monofilaments with low tissue reaction. Polypropylene is effectively unchanged in tissue and keeps its strength indefinitely; nylon loses strength slowly over a long period. Polypropylene is more plastic and nylon more elastic, which changes handling and knot behaviour.
Which is stronger, polypropylene or nylon?
Both meet the same pharmacopoeial minimum strength for their size when placed. The meaningful difference is over time: polypropylene maintains its strength while nylon declines slowly, which matters only for sutures left in place for a long time.
Why is polypropylene used for vascular surgery?
Because it is very smooth, slides easily through vessel walls, has low thrombogenicity and is not degraded, so an anastomosis keeps its support indefinitely.
Why is nylon common for skin closure?
It handles well, holds knots with correct technique, provokes little reaction, and its slow long-term strength loss is irrelevant for sutures that are removed once the wound has healed.
Do polypropylene or nylon sutures dissolve?
No. Both are non-absorbable and remain in tissue unless removed. Skin sutures of either material are taken out after healing; buried ones stay in place.
What are the Dolphin Sutures equivalents?
Duracare is polypropylene and Linex is polyamide (nylon).
Instructions for use
This article compares two non-absorbable suture materials in general terms. Properties, indications and contraindications for a particular product are stated in its instructions for use, which is the controlled document and the only correct source for them.
Medical & regulatory notice
This article is general reference information for healthcare professionals about classes of device. It is not a substitute for the instructions for use supplied with any product, it is not clinical guidance, and it does not describe the regulatory status of any particular device in any market. Product availability, indications and classification differ between jurisdictions. Clinical decisions about a patient are for the treating clinician.