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Polyester Polyolefin Rope - Strength

Polyester Polyolefin dual fiber 3-strand rope - minimum breaking strength and safe load

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Minimum breaking strength and safe load of polyester polyolefin rope are indicated below.

Rope DiameterMinimum Breaking StrengthSafe Load
(Safety Factor 12)
Weight
(in)(mm)(lbf)(kN)(lbf)(kN)(lbm/ft)(kg/m)
1/4 6 1200 5.34 100 0.445 0.016 0.024
5/16 8 1870 8.3 156 0.693 0.025 0.037
3/8 10 2700 12.0 225 1.00 0.036 0.054
7/16 11 3500 15.6 292 1.30 0.048 0.071
1/2 12 4400 19.6 367 1.63 0.062 0.092
9/16 14 5200 23.1 433 1.93 0.079 0.118
5/8 16 6100 27.1 508 2.26 0.095 0.141
3/4 18 8400 37.4 700 3.11 0.135 0.201
7/8 22 11125 49.5 927 4.12 0.180 0.268
1 24 13175 58.6 1100 4.89 0.218 0.324
1 1/16 26 14775 66 1230 5.47 0.245 0.365
1 1/8 28 16325 73 1360 6.05 0.271 0.403
1 1/4 30 19900 89 1660 7.38 0.334 0.495
1 3/8 32 21950 98 1830 8.14 0.365 0.543
1 1/2 36 28250 126 2350 10.5 0.470 0.699
1 5/8 40 32950 147 2750 12.2 0.550 0.818
1 3/4 44 36850 164 3070 13.7 0.620 0.923
2 48 48050 214 4000 17.8 0.810 1.21

Example - Maximum Safe Mass for a 3/8" Polyester Polyolefin 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 polyolefin rope where safe load is 1.0 kN can be calculated as

m = (1.0 103 N) / (9.81 m/s2)

   =  102 kg 

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