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KL Cranes and Lifting Equipment Botswana

FIBRE ROPE

Comparative Characteristics of various fibres used in Cordage

a
Nylon
Polyester
Polypropylene
Polyethylene
Manila
Sisal
Cotton
Strenth:
a
a
a
a
a
a
a
Tenacity of dry fibre (in grams/denier:
9.0
8.5
6.5
5 - 6.0
5 - 6.0
4 - 5.0
2 - 3.0
Wet Strength compared to dry strenght:
85 - 90%
100%
100%
100%
Up to 120%
Up to 120%
Up to 120%
Rope shock load absorbtion ability
Exellent
Good
Very Good
Very Good
Poor
Poor
Very Poor
a
a
a
a
a
a
a
a
Weight:
a
a
a
a
a
a
a
Specific gravity of fibres or filaments:
1.14
1.38
.91
0.95
1.50
1.5
1.54
Able to float:
No
No
Yes
Yes
Yes
No
No
a
a
a
a
a
a
a
a
Rope Strenght/wgt.ratio (average):
3
2.25
2.5
2.1
2.1
.75
.50
a
a
a
a
a
a
a
a
Elongation:
a
a
a
a
a
a
a
Typical per cent of rope elongation at 20% of the Breaking
Test:
20 - 25%
16 - 18%
18 - 22%
20 30%
10 - 12%
10 - 12%
0%
Average per cent of rope elongation at 20% of Breaking Test:
42%
29%
37%
High
19%
19%
0%
Creep (extension under sustained load):
Moderate
Low
High
High
Very Low
Very Low
Zero
a
a
a
a
a
a
a
a
Effects of Moisture:
a
a
a
a
a
a
a
Water absorbtion of individual fibres:
8.0 - 12.0%
1.0
None
None
Up to 100% of weight
Up to 100% of weight
Up to 100% of weight
Resistance to rot, mildew and deterioration due to marine
organisms:
Exellent
Exellent
Exellent
Exellent
Poor
Very Poor
Very Poor
a
a
a
a
a
a
a
a
Chemical Resistance:
a
a
a
a
a
a
a
Effects of Acids:
Decomposed
by strong
mineral acids
Resistant to
most mineral Acids;
disintegrated
by 95%
sulphuric
acid
Very Resistant
Very Resistant
Will disintegrate in
hot diluted
and cold
concentrated
acids
Same as Manila
Same as Manila
Effects of Alkalies:
Little or none
No effect
cold; slowley
disintegrated
by strong
alkalies at
the boil
Very Resistant
Very Resistant
Poor resistance- whill lose strength where exposed
Same as Manila
May swell but will not be damaged
Effects of Organic Solvents:
Resistant,
soluble in
some
phenolic
compounds
and in 90%
formic acid
Generally
unaffected.
Soluble in
some
phenolic
compounds
Soluble in
chlorinated
hydrocarbons
at 40°C
Soluble in hot
chlorinated
hydrocarbons
Fair resistance for
fibre, but
hydrocarbons
will remove
protective
lubricants on
rope
Good Resistance
Good Resistance
a
a
a
a
a
a
a
a
Degradation:
a
a
a
a
a
a
a
Resistance to ultraviolet in sunlight:
Good
Exellent
Good when UV
stabilised
(black is best)
Fair. Good
when UV
stabilised
Good
Good
Good
Resistance to ageing for properly stored rope:
Exellent
Exellent
Exellent
Exellent
Good
Good
Good
a
a
a
a
a
a
a
a
Rope Abrasion Resistance:
a
a
a
a
a
a
a
Surface:
Very Good
Best
Good
Fair
Good
Fair
Good
Internal:
Exellent
Best
Good
Good
Good
Good
Good
a
a
a
a
a
a
a
a
Effect of Temperature on Dry Rope:
a
a
a
a
a
a
High Temperature working limit:
149°C
149°C
93.2°C
80°C
149°C
149°C
149°C
Low temperature working limit:
-21.1°C
-21.1°C
-26.7°C
-50°C
-37.8°C
-37.8°C
-37.8°C
Melts at:
249°C
250°C
164°C
130°C
a
a
a
a
a
a
a
a
a
a
a
Ability of rope to render, or ease out, smoothly over metal
while under load:
Poor
Good
Very Poor
Very Poor
Exellent
Good
Good


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