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# Polypropylene Fiber Rope - Strength

## Polypropylene fiber 3-strand and 8 strand rope - minimum breaking strength and safe load.

Polypropylene rope is made of from monofilament or film polypropylene.

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

(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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