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 Diameter		Minimum Breaking Strength		Safe Load (Safety Factor 12)		Weight
(in)	(mm)	(lb_f)	(kN)	(lb_f)	(kN)	(lb_m/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

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

m = F / g (1)

where

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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