| Physical properties of the cellulosic group fibres
| Fibre |
Acetate |
Cupro |
Viscose |
| Chemical basis |
Cellulose diacetate |
Regenerated cellulose |
Regenerated cellulose |
| Density g/cm³ |
1,32 |
1,5 ÷ 1,52 |
1,5 ÷ 1,52 |
| Tenacity g/dtex |
1,1 ÷ 1,3 |
1,5 ÷ 1,8 |
1,3 ÷ 2,0 |
| Tenacity when wet g/dtex |
0,6 ÷ 0,8 |
1,0 ÷ 1,3 |
0,6 ÷ 1,3 |
| Elongation % |
23 ÷ 30 |
14 ÷ 16 |
15 ÷ 30 |
| Elongation when wet % |
30 ÷ 40 |
22 ÷ 26 |
20 ÷ 40 |
| Fusion temperature
°C |
melts at
250 ÷ 255 |
decomposes
at 200 ÷ 210 |
decomposes
at 200 ÷ 210 |
| Softening temperature °C |
190 ÷ 205 |
----- |
----- |
| Moisture regain % |
6,5 |
13 |
13 |
| Shrinkage in water at 95 °C
% |
< 2 |
3,5 ÷ 4 |
6,5 ÷ 7 |
| Dye affinity |
Disperse and diazo dyes |
Almost
all dyestuffs, with exception of disperse and acid dyes |
Almost all dyestuffs, with exception of disperse and acid dyes |
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