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Polyester Rope - Strength

Polyester 3-strand and 8-strand rope - minimum breaking strength and safe load

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Polyester rope is made from continuous filament polyester.

Minimum breaking strength and safe load for polyester rope:

Rope DiameterMinimum Breaking StrengthSafe Load
(Safety Factor 12)
Weight
(in)(mm)(lbf)(kN)(lbf)(kN)(lbm/ft)(kg/m)
3/16 5 765 3.40 63.8 0.284 0.011 0.016
1/4 6 1315 5.85 110 0.487 0.020 0.029
5/16 8 2050 9.1 171 0.760 0.031 0.045
3/8 10 2900 12.9 242 1.07 0.044 0.065
7/16 11 3915 17.4 326 1.45 0.059 0.088
1/2 12 5085 22.6 424 1.88 0.077 0.115
9/16 14 6435 28.6 536 2.39 0.098 0.146
5/8 16 7825 34.8 652 4.15 0.120 0.179
3/4 18 11200 49.8 933 5.65 0.172 0.256
7/8 22 15225 67.7 1270 7.34 0.234 0.348
1 24 19775 88.0 1650 8.23 0.304 0.452
1 1/16 26 22225 99 1850 9.21 0.342 0.509
1 1/8 28 24800 110 2070 11.0 0.385 0.573
1 1/4 30 29800 133 2480 12.1 0.465 0.692
1 3/8 32 32500 145 2710 15.7 0.465 0.759
1 1/2 36 42200 188 3520 18.2 0.51 0.997
1 5/8 40 49250 219 4100 21.1 0.67 1.16
1 3/4 44 57000 254 4750 26.7 0.78 1.35
2 48 72000 320 6000 30.0 0.91 1.74

Example - Maximum Safe Mass for a 3/8" Polyester Rope

The relationship between mass and force (weight) can be expressed as

m = F / g                              (1)

where 

F = force, weight (N)

m = mass (kg)

g = acceleration of gravity (9.81 m/s2

Maximum safe mass for a 3/8" polyester rope where safe load is 1.07 kN can be calculated as

m = (1.07 103 N) / (9.81 m/s2)

   =  109 kg 

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