Polyester is resistant to many acids, but is subject to degradation, ranging from little to moderate in some acids.
Each application shall be evaluated, taking into consideration the following:
a. Type of acid
b. Exposure conditions
c. Concentration
d. Temperature
Alkali
Polyester is subject to degradation alkalis, ranging from little to total degradation.
Each application shall be evaluated, taking into consideration the following:
a. Type of alkali
b. Exposure conditions
c. Concentration
d. Temperature
Polyester roundslings shall not be used at temperatures in excess of 194° F (90° C), or at temperatures below minus 40° F (-40° C).
Polyester roundslings incorporating aluminum fittings shall not be used where fumes, vapors, sprays, mists or liquids of alkalis and/or acids are present.
Polyester roundslings should be stored in a cool, dry, and dark place to prevent loss of strength when not in use through exposure to ultra-violet rays. Polyester roundslings shall not be stored in chemically active areas.
Inspection
Polyester roundslings shall be visually inspected by a designated person handling the polyester roundsling before each use. These visual observations shall be concerned with the identification tag and discovering damage. Polyester roundslings shall be removed from service if there is any doubt as to the condition of the roundsling.
Type of Inspection
a. Initial Inspection—Before any polyester roundslings placed into service it shall be inspected by a designated person
to ensure that the correct round sling is being used, as well as to determine that the roundsling meets the
requirements of this specification.
b. Frequent inspection—This inspection shall be made by a qualified person handling the polyester roundsling each
time the roundsling is used.
c. Periodic Inspection—This inspection shall be conducted by a designated person. Frequency of inspection should be
based on:
1. Frequency of use
2. Severity of service conditions
3. Experience gained on service life of polyester round slings used in similar applications.
4. Periodic inspections should be conducted at least monthly.
Written inspection records, utilizing the identification for each polyester roundsling as established by the user, should be kept on file. These records should show a description of the new polyester roundsling and its condition on each subsequent inspection.
There shall be no repairs of load bearing fibers. Repairs to the protective covers shall be done only by the original manufacturer or their appointed agent.
Only polyester roundslings which can be identified from the information on the identification tag shall be repaired.
All repaired polyester roundslings shall be proof tested m a minimum of two (2) times the rated capacity before being put back into service. Certification of proof test should be provided.
Chemically active environments can affect the strength of polyester roundslings in varying degrees ranging from little to total degradation. The polyester roundsling manufacturer, or qualified person, should be consulted before roundslings are used in a chemically active environment.
