Fire Retardant Durability Para Aramid Filament Sewing Thread

Para-armaid thread is fire retardant sewing thread made from para-aramid continuous filament. This thread offers thermal resistance and protective seam durability in applications exposed to high external heat.

Para aramid thread is one of the strongest and most heat resistant commercially available threads. It is about 2 times stronger than nylon and polyester, has very little stretch, does not melt, and decomposes at 800 degree °F .

This makes it a great choice for high stress applications including sewing seams on heavy duty clothing, conveyer belts, harnesses and bags, reinforcing plastics, and other fibers, and even providing high-temperature controls for model airplanes and rockets.

Para aramid thread is stronger, more heat resistant, less stretchy, durable than most other threads. But, thread is usually a very small part of material content. This means that using para aramid thread with materials that do not have its properties is a waste and could be dangerous.

ENDNUS manufacturers Para-aramid continuous filament for a variety of sewing operations with main specifications as following.

Commercial	Tex Size	Government Specification MIL-T-87128(USAF)	Tensile Strength (Lbs.)	Yards Per Pounds	Diameter (Inches/mm)
15	16	00 (100×2)	4	28,000	0.004/0.10
23	21	AA (100×3)	6	25,000	0.006/0.15
46	40	B/2 (200×2)	14	10,000	0.008/0.21
69	60	E/3 (200×3)	23	6,700	0.010/0.25
92	80	F/4 (200×4)	30	5,000	0.011/0.29
138	120	FF/3 (400×3)	45	3,350	0.014/0.36
207	210	3-Cord (400×5)	64	2,100	0.018/0.46
346	350	5-Cord (1000×3)	135	1,050	0.026/0.65
415	500	6-Cord (1500×3)	150	900	0.032/0.82
800	800	8-Cord (1500×5)	225	500	0.045/1.14

COLOR

Nobody buys filament aramid thread for its color. It normally comes a color called Natural (yellow) and cannot be dyed after it is manufactured. Usually, color is not a problem because it takes a back seat to strength and heat resistance in most applications. But, t here i s already have colored para aramid filament on the market. And we can do other colors Black, Red, Blue and Aramy Green.

Note: Take availability into consideration when there is an ongoing need. We regularly stock para aramid filament thread in several sizes and do our best to keep them in stock. We also have other thread in sizes that we do not regularly stock and we will probably not have them when our current supply runs out.

Decomposition

Para aramid thread begins to decompose (turn to ash) at about 800 degree °F  (426 ° C ) , m uch higher than nylon or polyester.

Melting

Para aramid thread does not melt. This is important in fire retardant gear.

Stretchiness

Para aramid thread stretches about 2% before it breaks. For example, a 100 foot piece of para aramid would be 102 feet long just before it breaks. If you sew stretchy fabrics with para aramid the seams will pucker.

Acids and alkalis

Good resistance to dilute acids and bases. Degraded by strong mineral acids and to lesser extent, by strong mineral bases. This is important when para aramid thread is used in a laboratory setting .

Mildew, aging, and sunlight

Excellent resistance to mildew and aging. Prolonged exposure to sunlight causes deterioration. Polyester thread works just as well in some cases.

Abrasion

Good abrasion resistance.

Flame-resistant clothing

Heat protective clothing and helmets

Body armor

Composite materials

Asbestos replacement (e.g. brake linings)

Hot air filtration fabrics

Tires

Mechanical rubber goods reinforcement

Ropes and cables

Wicks for fire dancing

Optical fiber cable systems

Sail cloth (not necessarily racing boat sails)

Sporting goods

Drumheads

Wind instrument reeds

Loudspeaker diaphragms

Boathull material

Fiber reinforced concrete

Reinforced thermoplastic pipes

Tennis strings

Hockey sticks

Snowboards

Jet engine enclosures