Property

SPF

Cotton

Viscose

Silk

Wool

Breaking strength

(CN/dtex)

Dry

3.8-4.0

1.9-3.1

1.5-2.0

2.6-3.5

0.9-1.6

Wet

2.5-3.0

2.2-3.1

0.7-1.1

1.9-2.5

0.7-1.3

Dry breaking extension (%)

18-21

7-10

18-24

14-25

25-35

Initial Modulus (kg/mm²)

700-1300

850-1200

850-1150

650-1250

Loop strength (%)

75-85

70

30-65

60-80

Knot strength (%)

85

92-100

45-60

80-85

Moisture regain (%)

8.6

9.0

13.0

11.0

14-16

Density (g/cm³)

1.29

1.50-1.54

1.46-1.52

1.34-1.38

1.33

Heat endurance

Yellowing and tackifing at about 120° C

(Bad)

Becoming brown

After long time

Processing

at 150° C(Ecellent)

Strength down

after longtime processing

at 150° C (Good)

Keep stable

When temperature <=148° C

(Good)

(Good)

Alkali resistance

At general level

Excellent

Excellent

Good

Bad

Acid resistance

Excellent

Bad

Bad

Excellent

Excellent

Ultraoviolate resistance

Good

At the general level

Bad

Bad

Bad