High-performance fiber

Kynol has high flame resistant characteristics, does not melt even at high temperatures, and has little heat shrinkage. In addition, it is called a highly safe fiber because it only carbonizes and emits a small amount of smoke when it is exposed to flame.

Typical characteristics

Typical characteristics of Kynol fiber

Hue Gold
Specific gravity 1.27
Fiber diameter 10〜40um
Fiber length 1〜100mm
Tensile strength 140〜200 N・mm¯²
Elongation 10〜60%
Modulus 3,000〜4,000 N・mm¯²
Moisture <6%

Smoke emission test

Kynol is composed of only C (carbon), H (hydrogen) and O (oxygen).
Therefore, it does not contain any phosphorus or nitrogen elements which cause toxic gases when burned. It does not contain nitrogen.
In addition, it produces less smoke than organic and natural fibers.


Compare L.O.I of fibers

Kynol 30~34
Aramid 28
Modacrylic 26
Polyester 22
Cotton 19

Compare heat shrinkage

  • Kynol
  • FR Cotton
  • Heat resistance Nylon
A main advantage of Kynol fiber is its high heat resistance, non-melting and low thermal shrinkage even at high temperatures. The photo above shows the results of a simple test in which several types of flame-retardant material felts were blasted with a burner at 800°C for 30 seconds. Kynol fiber only carbonizes during firing, resulting in a low amount of smoke and a low rate of toxic gas emissions.

Chemical resistance

Concentration(%) Temperature(℃) Exposed Time(hrs) Effect on Breaking Strength
Acid Hydrochloric acid 20 98 1,000
Sulfuric acid 60 60 100
Nitric acid 10 20 100
Nitric acid 70 20 100 ×
Fluoric acid 15 50 40
Alkalis Ammonia 28 20 100
Sodium hydroxide 10 20 100
Sodium hydroxide 40 20 100
Organic solvent 100 98 1,000
Meaning of symbols:
◎Less than 10% Strength Loss 〇11-25% Strength Loss ×81-100% Strength Loss
Kynol chemical resistance performance is excellent. In particular, against acids. It does not dissolve in concentrated hydrochloric acid, and is virtually undamaged. It is also insoluble in organic solvents.