Guide · For the trade
Solution dyed nylon carpet: what it is, where it earns its place, and how to read it on a spec sheet
Solution dyed nylon carpet is nylon whose color is added as pigment to the molten polymer before the fiber is extruded, so the color runs through the whole filament rather than sitting on its surface. The result is a yarn that does not fade in sun, does not bleed, and can be cleaned with a 10 percent bleach solution without losing color, which is why it is the fiber behind most commercial, hospitality and pet-focused lines. Piece dyed and printed nylon take color after the fiber is made, give a wider palette and sharper multi-color patterns, and need a stain treatment to resist what solution dyed resists on its own.
This guide is for the designer or the junior who has seen "SD nylon" on a spec sheet and wants to know what it buys, which rooms justify it, and what it gives up. It covers the dye methods compared, where it is the right spec, the limits, how to confirm it on a spec sheet, and the questions clients ask. Fiber choice between nylon and the other synthetics is in the nylon vs polyester guide.
What is solution dyed, in one paragraph
Nylon starts as pellets melted and forced through a spinneret into continuous filament. In solution dyeing, the pigment goes into the melt, so every cross-section of the fiber is colored like a carrot; the trade's phrase is "the color is in the fiber, not on it". In piece dyeing, undyed carpet is run through a dye bath after tufting and the dye bonds to the outside of each filament, like a radish. In printing, dye is applied to a white tufted face in a pattern. Yarn and space dyeing color the yarn after extrusion and behave like piece dyeing. The dye method sits on the spec sheet under "dye method" or inside the fiber line as "solution dyed BCF nylon" or "SD nylon 6,6".
Solution dyed vs piece dyed vs printed
| Property | Solution dyed nylon | Piece dyed nylon | Printed nylon |
|---|---|---|---|
| Where the color is | Through the filament | On the filament surface | On the face, in a pattern |
| Lightfastness | Highest; rated for sun rooms and south glass | Good with UV inhibitors; fades over years in direct sun | Good; pattern edges soften first |
| Bleach and strong cleaners | Cleanable with a 10 percent bleach solution | Bleach strips color | Bleach strips color |
| Stain resistance | Inherent to most food and pet stains | Depends on the stain treatment | Depends on the stain treatment |
| Palette and pattern | Limited per mill; patterns from 2 to 6 yarn colors | Widest solids; saturated colors | Unlimited colors, fine detail |
| Typical use | Commercial, hospitality, multifamily, pet and family rooms | Residential cut pile | Residential and hospitality patterns |
Durability is not in the table because it is not a dye-method question. Resilience and texture retention come from the nylon itself (type 6 or 6,6), the twist, the density and the construction; a 28 oz solution dyed loop and a 28 oz piece dyed loop wear the same. The dye method changes the color's life, not the pile's; the carpet density guide covers the rest.
Where solution dyed nylon is the right spec
Any floor that will be cleaned hard, hit by sun, or lived on by animals. In a commercial or hospitality project it is the default, because housekeeping uses chemistry a residential carpet never sees, and because a corridor under skylights fades a piece dyed carpet in a stripe along the glass. In a residence it is the answer for the family room, the mudroom, a sunroom, a beach house and a rental. Masland's EnVisionSD Pet Solutions lines, in loop, cut-and-loop and tip-shear patterns, are solution dyed BCF nylon with lifetime stain and soil warranties, Class I radiant panel ratings and Green Label Plus certificates, and they are the residential starting point in our library. The pet-friendly carpet guide and the performance carpet guide cover the room-by-room case.
Where it is not, and what it gives up
Three things. Palette: because each color is a production run of fiber, a mill offers a solution dyed line in perhaps 12 to 30 colors against 40 or more for a piece dyed one, and the colors lean to heathered mid-tones. Depth: a piece dyed cut pile takes a saturated navy or a true red that solution dyeing reaches only in blends. Pattern: detailed multi-color florals and painterly prints are printed or piece dyed by nature; Milliken's residential nylon is printed after tufting for exactly this reason. For a formal living room or a primary bedroom with no sun and no dog, the piece dyed line with a good stain treatment is the better-looking carpet, and the honest spec.
Solution dyed is not only nylon
The term describes a process, not a fiber, and the spec sheet has to be read for both. Polypropylene is always solution dyed because it will not take dye any other way; Kane Carpet's woven Wiltons in its Eurolon yarn are solution dyed polypropylene and polypropylene-polyester blends. Stanton's Pet Guard lines are 100 percent solution dyed polyester. Both are fade-proof and bleach-cleanable, and neither is nylon: the polypropylene crushes in a traffic lane and the polyester mats in 3 to 5 years. When the brief says solution dyed nylon, both words have to be on the sheet.
How to confirm it on the spec sheet
- Fiber line: "100 percent solution dyed nylon", "SD nylon", "solution dyed BCF nylon type 6,6" or a mill's branded yarn with SD in the name. "100 percent nylon" alone is piece dyed until proven otherwise.
- Dye method line: "solution dyed" or "solution/space dyed".
- Cleaning line: one that permits a bleach solution, usually 1 part bleach to 10 parts water, is the tell; a piece dyed sheet prohibits it.
- Warranty: lifetime or 20-year stain and fade warranties, and a colorfastness-to-light rating under AATCC 16 of 4 or better on a commercial sheet.
- The sample: a drop of diluted bleach on a corner, left overnight, is the field test, and we will run it before the order if asked.
The common complaint online is the client who paid for solution dyed and received piece dyed; the order acknowledgment should repeat the fiber line from the sheet, and ours does.
Questions designers ask
What are the pros and cons of solution dyed nylon carpet?
Pros: it will not fade, bleed or lose color to bleach, it resists most food and pet stains without a topical, and it wears as any nylon does. Cons: a shorter color card, fewer saturated darks, fewer detailed multi-color patterns, and a modest premium over a piece dyed line of the same construction.
Is solution dyed nylon worth the extra cost?
In sun, with pets, in a rental or anywhere cleaned with chemistry, yes. In a low-traffic, no-sun room, no; the money is better spent on density or on wool.
How is solution dyed different from stain-resistant nylon?
Stain resistance on a piece dyed nylon is a topical treatment; it works until it is cleaned or worn off, and bleach still strips the color. Solution dyed resists stains because the pigment leaves no dye sites for a stain to bond to, and nothing wears off.
Does solution dyed nylon fade at all?
Not measurably over the life of the carpet; it is the fiber specified for sunrooms and glass-walled corridors. A piece dyed nylon in the same window fades in a line along the glass in 3 to 5 years. The carpet fading guide has the test numbers.
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