Polyester Ropes - Strengths
Polyester rope is made from continuous filament polyester.
Minimum breaking strength and safe load for polyester rope:
| Rope Diameter | Minimum Breaking Strength | Safe 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 | 2.90 | 0.120 | 0.179 |
| 3/4 | 18 | 11200 | 49.8 | 933 | 4.15 | 0.172 | 0.256 |
| 7/8 | 22 | 15225 | 67.7 | 1270 | 5.65 | 0.234 | 0.348 |
| 1 | 24 | 19775 | 88.0 | 1650 | 7.34 | 0.304 | 0.452 |
| 1 1/16 | 26 | 22225 | 99 | 1850 | 8.23 | 0.342 | 0.509 |
| 1 1/8 | 28 | 24800 | 110 | 2070 | 9.21 | 0.385 | 0.573 |
| 1 1/4 | 30 | 29800 | 133 | 2480 | 11.0 | 0.465 | 0.692 |
| 1 3/8 | 32 | 32500 | 145 | 2710 | 12.1 | 0.465 | 0.759 |
| 1 1/2 | 36 | 42200 | 188 | 3520 | 15.7 | 0.51 | 0.997 |
| 1 5/8 | 40 | 49250 | 219 | 4100 | 18.2 | 0.67 | 1.16 |
| 1 3/4 | 44 | 57000 | 254 | 4750 | 21.1 | 0.78 | 1.35 |
| 2 | 48 | 72000 | 320 | 6000 | 26.7 | 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
Polyester Rope Safe Load Chart
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