Carpet Fibers

The esthetics and performance of carpet is similar to the fabric in your clothing. The type of fiber used, the construction of the cloth, and the color all play a role in the styling, cost, and performance of that garment.

All carpet yarn is manufactured from either a Staple or Continuous Filament (BCF) fiber. Staple fiber is a series of short, 6 to 7 inches in length, strings spun together to form one continuous filament. Several of these are twisted together to form a strand of yarn. BCF fiber is a continuous filament manufactured as one long string. These are twisted and headset together to form a strand of yarn. Both of these processes create yarns that produce carpet products with distinctly different looks and characteristics.

A Description of Common Carpet Fibers

Nylon

The most frequently used carpet fiber, highly desirable due to its exceptional durability, versatility, and reasonable pricing. It can be dyed in an endless variety of colors and made into numerous styles and textures. Nylon is commonly used in residential and commercial applications.

Polyester

Used in residential and a few commercial applications, polyester has good color clarity, colorfastness, and resistance to water-soluble stains. All of Mohawk's staple polyester yarn comes from our state-of-the-art plastic bottle recycling facility. This "food-grade" PET Polyester fiber might be considered to be better quality than "carpet-grade" polyester fiber.

Polypropylene

Also known as Olefin, this fiber resists fading, generates low levels of static electricity, is favorably priced, and can be engineered in outdoor applications. Due to its manufacturing process, polypropylene inherently resists stains. When used in specific carpet constructions, this yarn will perform as well as most resilient fibers.

Wool

The most expensive of the fibers listed here, it is a natural fiber with moderate soil and stain resistance. Durable, luxurious "hand", reduced visible soil due to fine, light-scattering characteristics.

	Nylon (filament)	Nylon (staple)	Olefin (filament)	Polyester (staple)	Wool (staple)
Fiber Strength	Excellent	Excellent	Excellent	Excellent	Good
Appearance Retention	Excellent	Excellent	Fair	Fair	Excellent
Stain Resistant*	Very Good	Very Good	Excellent	Very Good	Very Good
Soil Resistant**	Very Good	Very Good	Fair	Good	Very Good
Cleaning	Very Good	Very Good	Very Good	Good	Very Good
Available Colors	Excellent	Excellent	Fair	Very Good	Fair
Pilling & Fuzzing	Excellent	Fair	Very Good	Fair	Fair
Resistance to Household Cleaners	Very Good	Very Good	Excellent	Very Good	Good

Fiber Type	Definition	Characteristics
Nylon	Fiber-forming substance of any long-chain, synthetic polyamide having recurring amide groups as an integral part of the polymer chain. First used in 1959 in carpet. Offered as BCF or staple. Used in residential and commercial applications. Produced as a solution-dyed fiber or white yarn to-be-dyed. Accounts for 65% of all face fibers in carpet.	Durable, resilient Abrasion-resistant. Versatile in coloration possibilities Favorably priced. Must be treated to be stain and soil resistant.
Polyester	Made from terephthalic acid and ethylene glycol. Offered primarily as a staple product, although some BCF in being produced. Used in residential and commercial applications. Manufactured from recycled plastic bottles.	Color clarity Colorfastness Resistant to water-soluble stains. Noted for luxurious "hand".
Polypropylene (Olefin)	Fiber-forming substance of any long-chain synthetic polymer composed of at least 85%, by weight, of ethylene, propylene, or other olefin units. Offered primarily as BCF with some staple product available. Primarily sold as solution-dyed or pre-dyed fiber. Can be engineered for outdoor applications.	Resists fading. Inherently stain resistant. Limited color selection. Generates low levels of static electricity. Chemical, moisture, and stain resistant. Favorably priced.
Wool	Natural fiber. Offered as staple yarn.	Luxurious "hand" Durable Inherent resilient property Scaly character of fiber scatters light and reduces visible soil. Largely self-extinguishing when burned. Will char rather than melt and drip

	Nylon	Polypropylene	Polyester	Wool
Market	60%	30%	8%	2%
“Hand”	Good	Poor	Very Good	Excellent
I.D. Method	Dissolves in formic acid. Burns to a hard black bead; puffs white smoke; extinguishes	Floats in water. Burns to a round hard tan bead.	Dissolves in hot meta-cresol. Burns rapidly to a round hard bead and gives off a pungent odor.	Dissolves in chlorine bleach. Burns with a burned-hair odor to a black crumbly residue.
Moisture Absorption	4.2-4.5%	0.01%	0.04-0.08%	Up to 30%
Specific Gravity	1.14	0.90	1.23	1.32
Resilience	Excellent	None	Fair	Good
Abrasion Resistance	Excellent	Very Good	Good	Good
Effects of Acids, Alkalis, and Solvents	Resistant to weak acids, but decomposes in strong mineral acids	Chemically inert	Resistant to most acids and solvents	Sensitive to acids and alkalis
Dye Methods	Acid; some solution dyed	Solution dyed	Dispersed Dyes	Various
Resistance to Mildew, Aging, Sunlight	Excellent resistance to mildew and aging. Prolonged sunlight can cause degradation.	Good resistance to all three	Excellent resistance to mildew and aging. Prolonged sunlight can cause degradation	Damaged by sunlight, mildew, moths, beetles. Sunlight can cause yellowing.
Color Retention	Very good	Excellent	Good	Good
Stain Resistance	Poor (5th generation very good)	Excellent	Excellent	Very Poor
Stains/Soils Attracted to Fiber	Acid dyes, except for 5th generation	Oil based	Oil based	Protein, urine, blood, meat juices
Melt Point °F	Type6-435º F; Type6,6-490º	320º F	509º F	None (ignites)
Cigarette Burn Resistance	None	None	None	Very good

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