|
SPECIFIC WEIGHT
Polypropylene has a specific weight lower than all
other chemicals fibres, which allows lighter weaves with an equal covering or a more
compact fabric with an equal weight.
| FIBRES |
Specific Weight
g/cm3 |
Difference % |
| Polypropylene
"POLISILK PP" |
0,91 |
- |
| Polyethylene |
0,95 |
5% |
| Polyamide |
1,14 |
25% |
| Acrylics |
1,14 -
1,20 |
25 -
30% |
| Wool |
1,32 |
45% |
| Acetate
Cellulose |
1,33 |
46% |
| Polyester |
1,38 |
52% |
| Flax |
1,49 |
64% |
| Cotton
and Jute |
1,50 |
65% |
| Viscose
rayon |
1,52 |
67% |
| SOLEF
(PVDF) |
1,78 |
95% |
| Glass |
2,54 |
180% |
FINENESS TABLE
Diameter expressed in microns, according to density
and evenness of filaments.
| Deniers |
Polisilk |
Polyamide 1,14 |
Wool 1,31 |
Acetate 1,33 |
Polyester 1,38 |
Cotton 1,50 |
Rayon 1,52 |
SOLEF (PVDF) 1,78 |
| 150 |
152 |
136 |
127 |
126 |
124 |
119 |
118 |
109 |
| 210 |
180 |
162 |
150 |
150 |
147 |
141 |
140 |
129 |
| 300 |
216 |
193 |
180 |
179 |
176 |
168 |
167 |
155 |
| 420 |
256 |
228 |
213 |
212 |
208 |
199 |
198 |
183 |
| 500 |
279 |
249 |
232 |
230 |
227 |
217 |
216 |
200 |
| 800 |
353 |
315 |
294 |
292 |
287 |
275 |
273 |
252 |
| 1000 |
395 |
352 |
329 |
327 |
321 |
308 |
305 |
282 |
PLASTICIZING AND MELTING POINT
| |
Plasticizing point |
Melting Point |
| POLYAMIDE
6.6 |
235/240 |
260 |
| POLYESTER |
230/240 |
255/260 |
| ACETATE
RAYON |
230 |
260 |
| POLYAMIDE
6 |
215 |
230 |
| ACRYLIC
(Leacríl) |
250 |
It
decomposes |
| POLYPROPYLENE
(Polisilk) PP |
155/160 |
170/175 |
| POLYETHYLENE |
120 |
130 |
| SOLEF
(PVDF) |
140 |
178 |
| OTHER FEATURES |
| Water content at
20ºC - 65% HR. |
1,05% |
| Maximum water
absorption |
0,10% |
| Specific heat
Cal/degree C. |
0.46, ignites with
difficulty and extinguishes itself automatically |
| Shrinkage after 30'
min. in water at 100º. |
Yarn without twist =
4 - 5% Yarn 100/150 Z = 2 - 2,5% |
| Shrinkage in air at
130º |
5 - 7% |
|