At Shankar Dori Udyog Pvt. Ltd.
How Do You Measure Rope Strength?
Each type of line, natural fibre, synthetic and wire rope, have different breaking strengths and safe working loads. Natural breaking strength of manila line is the standard against which other lines are compared. Synthetic lines have been assigned “comparison factors” against which they are compared to manila line. The basic breaking strength factor for manila line is found by multiplying the square of the circumference of the line by 900 lbs.
(900 lbs. X circumference 2 = breaking strength)
To calculate the breaking strength of synthetic lines you need to add one more factor. As mentioned above, a comparison factor has been developed to compare the breaking strength of synthetics over manila. Since synthetics are stronger than manila an additional multiplication step is added to the formula above.
(Comparison factor X 900 lbs. X circumference 2 = breaking strength)
Following is a comparison factor chart for synthetic lines:
| Line Material | Comparison Factor (greater than manila) |
|---|---|
| Nylon | 2.5 |
| Dacron | 2.5 |
| Polypropylene | 1.4 |
How to take care of your Rope?
1. Keep your rope off the ground: Keep your rope elevated so dirt, grease, chemicals, and various debris can’t touch it.
2. Store rope out of the sun and excessive heat: Excessive heat can weaken rope, so don’t store it in a hot shed or attic.
3. Inspect rope occasionally for damage: After you use your rope, do a quick inspection for damage. According to REI, you want to look for the following defects:
4. Clean your rope as needed: If your rope does get dirty, wash it in cold water with mild soap. Rinse with cold water to get the soap off and hang up and let air dry. Don’t put rope in the sun to speed the process.