Fibers
What are the four major fiber classifications?
Natural cellulose, natural protein, regenerated, and synthetic.
What does denier measure?
the linear mass density and thickness of individual fibers or yarns used in textiles.
What does ASTM D4157 measure?
Abrasion resistance using the Wyzenbeek method, commonly reported in double rubs.
What is flashover?
The point during a developing fire when conditions rapidly transition toward fully developed fire, with widespread ignition of combustible materials.
A restaurant booth needs a textile that can withstand heavy abrasion, frequent cleaning, spills, and sunlight. What specific fiber would work best?
Solution-dyed polyester
Nylon
Acrylic
Which natural fiber is naturally produced as a continuous filament?
Silk.
True or false: Higher denier means a finer fiber.
False. Higher denier generally means a heavier/coarser filament; lower denier means finer.
ASTM D4966 uses which abrasion machine?
Martindale
Two fabrics are exposed to the same flame source. Fabric A ignites quickly and continues burning, while Fabric B is more likely to self-extinguish after the flame is removed.
What fiber characteristic can help explain this difference in fire behavior?
Fiber composition and chemical structure. Different fibers have different thermal decomposition and combustion behaviors. For example, wool tends to resist sustained burning and can self-extinguish, while many cellulosic fibers such as cotton can continue to burn once ignited.
A client wants to install carpet next to an open fireplace. What textile fiber would work best for this application?
Rayon/viscose and lyocell are regenerated versions of what natural polymer?
Cellulose
What property describes a fiber's ability to return toward its original shape after deformation?
Resiliency / elastic recovery.
What does ASTM D4034 measure, and why is it important for upholstery?
Seam slippage. It measures how much yarns can slip at a seam under load; excessive slippage can cause upholstery seams to open or distort.
A textile is exposed to a small ignition source. The material ignites locally, but the fire has not yet spread throughout the room.
Which stage of fire is this most closely associated with?
ignition/localized fire.
A senior living facility wants floor-length drapery in a room with huge west-facing windows.
The client loves the look of silk.
What is your biggest concern with actual silk?
Light resistance. Prolonged UV/light exposure can weaken and fade silk.
What does a spinneret do?
It extrudes the fiber-forming material through tiny openings to form manufactured filaments.
A fabric looks worn, fuzzy, and thin after years of rubbing against a chair. What property was inadequate?
Abrasion resistance.
Match the test to the property:
A. AATCC 16
B. AATCC 8
C. ASTM D4157
D. ASTM D4034
A → 2
B → 3
C → 1
D → 4
A test is designed to determine how easily a flooring material allows flame to spread when exposed to radiant heat.
Which test should you think of, and what does it measure?
ASTM E648 / NFPA 253 — Flooring Radiant Panel Test.
A hospital waiting room chair needs to withstand heavy use, frequent cleaning, spills, and potential staining. What textile fibers would work best?
A manufacturer takes a continuous manufactured filament and cuts it into short pieces. Why would they do this?
To create staple fiber that can be spun using staple-spinning systems and produce yarn characteristics more similar to staple natural fibers
Explain the difference between hydrophilic and hydrophobic.
A designer receives a fabric spec sheet that says:
ACT Heavy Duty Upholstery: 50,000 double rubs
Lightfastness: Grade 4
Seam slippage: Pass
The client says, “The numbers look good, so this fabric is automatically appropriate for my project.”
Why is that conclusion incorrect? What else should the designer consider before specifying the fabric?
Because no single test result tells you whether a textile is appropriate for an end use. The designer needs to evaluate the fabric against the actual serviceability requirements of the project, including:
Your client gives you three fire-test results:
Without looking at your notes, explain what each test is intended to tell you and what type of textile/end use it is associated with.
ASTM D2859 — Methenamine Pill Test
→ Small-scale flammability/ignition behavior of textile materials.
ASTM E84 — Steiner Tunnel Test
→ Evaluates flame spread and smoke development of materials in the tunnel apparatus; commonly associated with interior finish materials.
NFPA 701
→ Tests flame propagation of textiles/films, particularly materials such as draperies, curtains, and similar applications.
Compare cotton, nylon, polyester, olefin, and wool. Which 2–3 textile fibers would work best for a high-use upholstery application, and why?
Strong answers: Nylon, polyester, and olefin
Why the others are less ideal:
Key takeaway: For high-use upholstery, prioritize durability, abrasion resistance, stain/soil resistance, cleanability, and colorfastness rather than choosing a fiber based only on comfort or appearance.