Characteristics of Fibres

Comparative Charactersistics of various Fibres
  Nylon Polyester Polyrene PP/Polysteel Polythylene Cotton
Strength            
Tenacity of dry fibre (in grams/denier) 9.0 8.5 7.5 7.2 5 - 6.0 2 - 3.0
Wet strength compared to dry strength 85 - 90% 100% 100% 100% 100% up to 120%
Rope shock load absortion abilit Excellents Good Very Good Very Good Very Good Very Poor
Weight            
Specific gravity of fibres or filaments 1.14 1.38 1.14 0.91 0.95 1.54
Able to float No No No Yes Yes No
Rope Strength/wgt.ratio (average) 3,0 2,25 2,5 2,5 2,1 0,50
Elongation            
Typical per cent of rope elongation @ Break 20-30% 12-18% 12-18% 18-22% 20-25% 10%
Creep (extention under sustained load) Moderate Low Low High High Low

 

Chemical Resistance
  Nylon Polyester Polyrene PP/Polysteel Polythylene Cotton
Effects of Acids Decomposed by strong mineral acids: resistant to weak acids Resistant to most mineral acids: disintegrated by 95% sulphuric acid Resistant to most mineral acids: disintegrated by 95% sulphuric acid Very Resistant Very Resistant Will Disinte-grate in hot diluted and cold concentrated acids
Effects of Alkalies Little or none No effect cold: slowly disintegrated by strong alkalies at the boil Very Resistant Very Resistant Very Resistant Will lose strength where exposed
Effect of Organic Solvents Resistant, soluble in some phenolic comp-ounds and in 90% formic acid Generally unaffected. Soluble in some phenolic compounds Generally unaffected. Soluble in some phenolic comp-ounds Soluble in chlorinated hydrocarbons Soluble in hot chlorinated hydrocarbons Good Resistance

 

Degredation
  Nylon Polyester Polyrene PP/Polysteel Polythylene Cotton
Resistance to ultraviolet in sunlight Good Good Good Good (UV-Stabalised) Good (UV-Stabalised) Good
Resistance to ageing for properly stored rope Excellent Excellent Excellent Excellent Excellent Good

 

Rope Abrasion Resistance
  Nylon Polyester Polyrene PP/Polysteel Polythylene Cotton
Surface Very Good Best Very Good Good Fair Good
Internal Excellent Best Excellent Good Good Good

 

Effect of Temperature on Dry Rope
  Nylon Polyester Polyrene PP/Polysteel Polythylene Cotton
High temperature working limit 149'C 149'C 130'C 93,2'C 80'C 149'C
Low temperature working limit -21'C -21'C -26'C -26,7'C -50'C -37,8'C
Melts at 249'C 250'C 180'C 164'C 130'C