Monday, May 21, 2012
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Synthetic Sling Inspection Criteria Print Email

Acid Damage

Heat Damage

Cuts

Cut & Tensile Damage

Abrasion Damage

Face Cuts

Punctures & Snags

Tensile Break

Illegible or Missing Tag

Inspection Criteria for Synthetic Web Slings

Refer to illustrations of damaged webbing. Remove from service if any of the following is visible:

  • Capacity tag is missing or illegible
  • Sling shows signs of melting, charring or chemical damage
  • End fittings are excessively pitted, corroded, distorted, cracked or broken
  • Cuts on the face or edge of webbing
  • Holes, tears, snags or crushed web
  • Signs of excessive abrasive wear
  • Broken or worn threads in the stitch patterns
  • Any other visible damage which causes doubt as to its strength

Examples of Web Sling Abuse

Most of the damage shown here would cause immediate catastrophic failure of the sling. Not all of the damage you will see will be this obvious or extreme, but still requires removal from use.

Elasticity - The stretch characteristics of web slings depends on the type of yarn and the web finish. Approximate stretch at RATED SLING CAPACITY is:

NYLON

POLYESTER

Treated

10%

Treated

7%

Untreated

6%

Untreated

3%

Environmental Considerations

  • Nylon and polyester are seriously degraded at temperatures above 194°F (90°C).
  • Prolonged exposure to ultraviolet light adversely affects nylon and polyester. Slings become bleached and stiff when exposed to sunlight or arc welding.
  • Many chemicals have an adverse effect on nylon and polyester. See Chemical chart below.
Chemical Environment Data

General guide only. For specific temperature, concentration and time factors, please consult Certified Slings prior to purchasing or use.

Chemical

OK

NO

 

Nylon

Polyester

Acids

 

*

Alcohols

   

Aldehydes

   

Strong Alkalis

 

**

Bleaching Agents

   

Dry Cleaning Solvents

   

Ethers

   

Halogenated Hydro-Carbons

   

Hydro-Carbons

   

Ketones

   

Oils Crude

   

Oils Lubricating

   

Soap & Detergents

   

Water & Seawater

   

Weak Alkalis

   

* Disintegrated by concentrated sulfuric acid.

** Degraded by strong alkalis at elevated temperatures.

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