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# Polypropylene Fiber Ropes - Strengths

Polypropylene rope is made of from monofilament or film polypropylene.

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

Polypropylene Fiber Ropes - Strengths
Rope DiameterMinimum Breaking StrengthSafe Load
(Safety Factor 12)
Weight
(in)(mm)(lbf)(kN)(lbf)(kN)(lbm/ft)(kg/m)
1/4 6 1125 5.00 93.8 0.417 0.01 0.02
5/16 8 1710 7.61 143 0.634 0.02 0.03
3/8 10 2430 10.8 203 0.90 0.03 0.04
7/16 11 3150 14.0 263 1.17 0.04 0.05
1/2 12 3780 16.8 315 1.40 0.05 0.07
9/16 14 4590 20.4 383 1.70 0.06 0.09
5/8 16 5580 24.8 465 2.07 0.07 0.11
3/4 18 7650 34.0 638 2.84 0.10 0.15
7/8 22 10350 46.0 863 3.84 0.14 0.21
1 24 12825 57.0 1070 4.76 0.18 0.27
1 1/16 26 14400 64.1 1200 5.34 0.20 0.30
1 1/8 28 16000 71.2 1330 5.92 0.23 0.34
1 1/4 30 19350 86.1 1610 7.16 0.28 0.41
1 3/8 32 21150 94.1 1760 7.83 0.30 0.45
1 1/2 36 27350 122 2280 10.1 0.39 0.59
1 5/8 40 31950 142 2660 11.8 0.46 0.68
1 3/4 44 36900 164 3080 13.7 0.53 0.79
2 48 46800 208 3900 17.3 0.69 1.03
.

### Example - Maximum Safe Mass for a 3/8" Polypropylene Fiber 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" polypropylene fiber rope where safe load is 0.9 kN can be calculated as

m = (0.9 103 N) / (9.81 m/s2)

=  91.7 kg

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