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ROPE CONSTRUCTION SELECTION GUIDE

 CHARACTERISTICS

 SOLID BRAID

 HOLLOW BRAID

 DOUBLE BRAID

 DIAMOND BRAID

 TWISTED
 Number of Strands or Carriers

 9, 12 or 18

 8, 12 or 16

 16, 24 or 32

 8 or 16

3
Spliceable

No

Yes

Yes

No

Yes
Strength to Weight

5

2

1

4

3
Flexibility

3

1

2

4

5
Flattens Under Load

No

Yes

No

Yes

No
Rotates Under Load

No

No

No

No

Yes
Mechanical Elongation

1

4

5

3

2
Cost Per Size

2

4

1

3

5
Working Load (as a % of TensileL)

15-20%

15-20%

15-20%

15-20%

8-14%
Abrasion Resistance

1

5

2

3

4
*WARNING: This guide is designed for general reference only. The construction comparisons assume using the same rope fiber and size. Expert advice should be sought when choosing a rope where protection of life or property is involved.

 

 

 

 

 

 

ROPE FIBER SELECTION GUIDE: Fiber Properties- Typical Values

CHARACTERISTICS

 Manila

 Sisal

Hemp

Jute
Coir

Cotton

Nylon

Polyester

Poly-
propylene

 Poly-
ethylene

Kevlar(1)

Spectra (2)
STRENGTH:
Breaking Tenacity- Dry (grams/ denier)
Wet Strength vs. Dry Strength
Shock-load Absorption Ability

5.0-6.0
Up to 120%

Poor

4.0-5.0
Up to 120%

Poor

4.0-5.0
Up to 120%

Poor
4.0-5.0
Up to 120%

Poor
4.0-5.0
Up to 120%

Poor


2.0-3.0
Up to 120 %

Very Poor


7.0-9.5
85-90%

Excellent


7.0-9.5
100%

Good


6.5
100%

Very Good


6.0
100%

Fair


18-26.5
95%

Poor


30.0
100%

Fair

WEIGHT:
Specific Gravity
Floats

 1.38
No

  1.38
No

1.38
No
1.38
No
1.38
No

 1.54
No

1.14
No

 1.38
No

 0.91
No

0.95
No

1.44
No

 0.97
No

ELONGATION:
Percent at Break
Creep (extension under
sustained load)

 
10-12%

Very Low

 
10-12%

Very Low

10-12%

Very Low
10-12%

Very Low
10-12%

Very Low

 
5-12%

Very Low

 
18-25%

Moderate


12-15%

Low

 
15-25%

High

 
15-25%

High

 
1.5-3.6%

Very Low


 3.5%

Moderate

EFFECTS OF MOISTURE:
Water Absorp. of Indiv. Fibers
Dielectric Properties

Up to 100%

Very Poor

Up to 100%

Very Poor

Up to 100%

Very Poor
Up to 100%

Very Poor
Up to 100%

Very Poor

Up to 100%

Very Poor

2.8%

Poor

<1%

Good

  None

Excellent

None

Excellent

3.5-7.0%

Poor

None

Excellent

Storage Requirements

Dry Only

Dry Only

Dry Only
Dry Only
Dry Only

Dry Only

Wet or Dry

Wet or Dry

Wet or Dry

Wet or Dry

Wet or Dry

Wet or Dry

ROPE ABRASION RESISTANCE:
Surface

Good

Fair

Fair
Fair
Fair

Poor

Very Good

Excellent

Good

Good

Fair

Very Good

Internal
Fair
Fair
Fair
Fair
Fair
Fair
Excellent
Excellent
Good
Good
Fair
Excellent
THERMAL PROPERTIES:
Melts at

Does not melt
Chars at 350°

Does not melt
Chars at 350°

Does not melt
Chars at 350°
Does not melt
Chars at 350°
Does not melt
Chars at 350°

Does not melt
Chars at 300°

420°-480°

490°-500°

330°

275°

800°- Begins to Decompose

297°

Resistance to Acids
Poor
Poor
Poor
Poor
Poor
Poor
Fair
Good
Excellent
Excellent
Fair
Excellent
Resistance to Alkalis
Poor
Poor
Poor
Poor
Poor
Fair
Very Good
Fair
Very
Excellent
Excellent
Fair
Excellent
Resistance to Oils and Gas

Poor

Fair

Poor
Poor
Poor

Poor

Very Good

Good

Very Good

Very Good

Very Good

Very Good

DEGRADATION:
Resistance to UV in Sunlight
Good
Good
Good
Good
Good
Good
Good
Excellent
Poor
(black is best)
Fair
(black is best)
Fair
Fair
Resistance to Rot and Mildew
Poor
Poor
Poor
Poor
Poor
Poor
Excellent
Excellent
Excellent
Excellent
Excellent
Excellent
 

Tensile strength specification sheets

Weight loads of rope are usually 10-15% of tensile strength
( These are general weight, but varies from rope manufacture to manufacture,
so please fine detailed info about the rope you buy! )

Braided Ropes
Nominal Size Nylon Double Braid Polyester Double Braid Spun Polyester Polypropylene Hollow Braid Floating Safety MFP Double Braid Solid Braid MFP
Inches Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs)
1/4" 2,400 1,550 1,400 1,225 1,710 882
5/16" 3,400 2,385 2,200 1,515 2,430 1,575
3/8" 4,800 3,420 3,200 2,575 3,420 2,100
7/16" 6,400 4,590 4,200 3,370 4,590 2,800
1/2" 8,400 5,940 5,600 4,470 6,030 3,500

Twisted Ropes

Nominal Size Nylon 3-Strand Twist Polypropylene 3-Strand Twist Polyester 3-Strand Twist Cotton 3-Strand Twist Manila 3-Strand Twist Sisal 3-Strand Twist
Inches Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs)
1/4" 1,490 1,120 1,490 450 539 480
5/16" 2,300 1,450 2,300     780
3/8" 3,340 2,250 3,340 990 1,213 1,080
7/16" 4,500 3,188 4,500      
1/2" 5,750 4,200 5,720 1,400 1,573 2,120

Braided High Performance Ropes

Nominal Size Kevlar Spectra Spectra/Kevlar Spectra/MFP Spectra Light/MFP
Inches Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs) Average Tensile (lbs)
1/4" 3,800 4,400 3,400 2,600 2,500
5/16" 5,600 7,000 5,500 4,200 3,600
3/8" 8,000 9,100 8,200 5,400 5,000
7/16" 11,800 12,300 11,500 7,300 7,000
1/2" 16,000 16,000 15,000 9,600  

 


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Last updated: 6/24/03 Webmaster MorTis 2003
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