CHEMICAL AND PHYSICAL CHARACTERISTICS OF THE SYNTHETIC FIBERS

 

FIBER

Chemical/physical characteristics

PA 6 HT

PA 66 HT

PES HT

PP

HPPE

PE

Tenacity (gr./den)

9

9

9

7

40

5

Elongation at break(%)

23

20

14

18

3,5

20

UV rays resistance

medium

weak

medium

medium

good

medium

Specific weight

1,14

1,14

1,38

0,91

0,97

0,97

Melting point C°

215-220

255-260

250-260

160-175

144-152

125-135

Resistance to alkalis

good

good

weak

good

good

good

Acid resistance

weak

weak

good

good

good

good

Moisture absorption%            (65%-20°C)

3,5-4,5

3,4-4,5

0,2-0,5

0

0

0

EMPIRICAL CRITERIA FOR IDENTIFICATION OF THE SYNTHETIC FIBERS

 

FIBER

Identification

PA

PES

PE

PP

Combustion

Fusion followed by a short-term flame with ejection of fused droplets

Fusion followed by slow combustion with bright yellow flame

Fusion followed by slow combustion with a dim blue flame

Fusion followed by slow combustion with a dim blue flame

Smoke

White

Nero with Soot

White

White

Odour

Celery

Hot oil

Blowing out candle

Hot wax

Residuals

Welding residuals grey/dark

Welding residuals hard and dark

Welding residuals soft

Welding residuals hard

ABBREVIATION

PA 6 HT

Polyamide (Nylon) 6 High tenacity

PA 6,6 HT

Polyamide (Nylon) 6,6 High tenacity

PES HT

Polyester  High tenacity

PP

Polypropylene

PE

Polyethylene

* Data from "Fisherman Handbook" - FAO - 1990
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