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| Comparision of basic properties of Varlan Fibre |
| SR. No. |
Property |
Varlan |
Wool |
Cotton |
Nylon |
Polyester |
| 1 |
| Tensile Strength (g/d) | Dry | | Wet |
|
2.5~5.0
2.0~4.5 |
1.0~1.7
0.8~1.7 |
3.0~4.9
3.3~6.4 |
4.5~7.5
3.7~6.4 |
4.7~6.5
4.7~6.5 |
| 2 |
Knot Strength (g/d) |
2.0~4.0 |
2.5~3.5 |
3.0~7.0 |
3.7~5.5 |
4.0~5.0 |
| 3 |
|
25~50
25~60 |
25~30
25~50 |
5.0~7.0
5.5~7.5 |
25~60
27~63 |
20~50
20~50 |
| 4 |
Young's Modulus (kg/mm2) |
400~850 |
130~300 |
950~1300 |
80~300 |
310~870 |
| 5 |
Moisture Regain (%)
(At 20ºC, 65% RH) |
1.2~2.0 |
16 |
7 |
3.5~5.0 |
0.4~0.5 |
| 6 |
Specific Gravity |
1.17 |
1.32 |
1.54 |
1.14 |
1.38 |
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Transition Temperature
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The second order transition temperature of Varlan acrylic fibre is 70~80ºC in water & around 95~105ºC in dry condition.
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Melting Point
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Varlan has no definite melting point. However, it decomposes before melting. A softening phase at about 220~240ºC occurs before the char point of the fibre is reached.
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Boiling Shrinkage
|
| Fiber Shrinkage (%) |
| Normal shrinkage |
21+/-1 |
| High shrinkage |
25+/-1 |
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Moisture
Regain
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Varlan has a low moisture regain, its commercial value being 1.5~2.0% under standard conditions of temperature and humidity.
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Chemical Properties
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Against acids, slight decrease in strength is observed at 0.5-1.0% concentration at 100ºC.
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Against organic solvents, strength is unaffected at ordinary temperature.
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Varlan is slightly affected by oxidizing agents.
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Varlan is insoluble in general solvents but is soluble in following solvents; Dimethyl formamide, Dimethyl sulphoxide (DMSO), Dimethyl acetamide (DMA), Ethylene carbonate, Saturated Zinc chloride solution etc.
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Resistance to Sunlight
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Varlan possesses high resistance to weathering and to sunlight. Even after extended exposure, it shows a negligible deterioration in its mechanical properties without suffering the yellowing and fading typical of other fibres.
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Microbial Resistance
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Varlan is highly resistant to action of Moth and Mildew.
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