Physical Rope Properties

Relative Density

A relative density of 1 is equivalent to a density of 1g per cm
The following table shows the relative density of water and steel compared to materials commonly used in the manufacture of fibe ropes.

 

Relative Density
Material

Relative Density

Nylon 1.14
Polyester 1.38
Polypropylene 0.91
HMPE 0.97
Aramid 1.44
Vectran 1.41
Zylon 1.54
Fresh Water 1
Sea Water 1.03
Steel 7.85


Melting Point

The table below show a typical melting or decopositon temperature of some common rope making.

 

Melting Point
Material

Melting Point °C

Nylon 6 220
Nylon 6.6 250
Polyester 260
Polypropylene 170
HMPE 150
Aramid 500 (decomposition)
Vectran 330
Zylon 650 (decomposition)

 

Chemical Resistance

This table shows the residual of synthetic fibres after chemical exposure under specific conditions 

Melting Point
Chemical

Conc WW%

Temp °C Time Hours Nylon Polyester Polypro-
pylene
Aramid HMPE
Acids
Hydrochloric 34 20 100 0 90 100 95 100
Nitric 66 20 100 0 70 100 95 95
Sulphuric 96 20 100 0 100 100 40 90
Formic 90 20 100 0 95 100 90 100
Acetic 100 20 10 85 95 100 100 100
Alkalis
Caustic Soda 40 20 100 50 0 90 90 100
Caustic Soda 20 70 150 100 0 100 85 90
Caustic potash 40 20 100 90 0 90 90 100
Solvents
Trychloroe-thylene 100 30 150 100 95 80 100 100
Carbon Tretrachloride 100 20 150 100 100 100 98 100
Benzene 100 70 150 100 100 100 98 95
Metacresol 100 100 4 0 0 100 80 100
Oxidising Agent
Hydrogen Peroxide 10 20 100 0 100 90 95 100