|
Twin-Path® Slings
Environmental / Chemical Considerations
- When not in use, synthetic slings should
be stored in a clean dry place. Heat sources
and non-ventilated places should be avoided.
- Chemically active environments can affect
the strength of synthetic lifting slings.
Different chemicals will react different
exposure to Covermax™ bulked nylon,
polyester, aramids, and Olefins. (Please
see the enclosed tables for reactions of
specific chemicals.)
- Aramids are resistant to most ketones,
alcohols, dry cleaning solvents and many
other organic solvents. Its acid resistance
is superior to that of nylon but is not
as good as that of polyester. Aramids show
good resistance to alkalis at room temperature,
but is degraded by strong alkalis at higher
temperatures.
- Aramids are compatible with fluorine-containing
elastomers, resins, and refrigerants at
high temperatures, and is resistant to
fluorine compounds in concentrations usually
encountered in stack gases from metallurgical
and rock-processing operations.
- The resistance of aramids to oxides of
sulphur at temperatures above the acid
dew point is superior to that of polyester.
Below the dew point, concentrated sulphuric
acid may condense on the fiber and cause
a progressive loss in strength.
- In moderate to strong acid or alkali
environments, evaluation of aramids should
be made to ensure that the yarn will perform
acceptably before use.
- Polyester and nylon are not significantly
affected by most compounds of the following
classes:
- Alcohols
- Dry Cleaning Hydrocarbons
- Ketones
- Soaps and Synthetic Detergents
- Water (Including Sea Water)
- Polyester also shows good to excellent
resistance to:
- Aqueous solutions of most weak acids
at the boil, and to most strong acids at
room temperature, but is disintegrated
by concentrated (95%) sulphuric acid at
room temperature.
- Aqueous solutions of strong alkalis at
room temperature, but is degraded at the
boil.
- Oxidizing agents, and is not degraded
by bleaching treatments ordinarily used
for textiles.
- Nylon is not significantly affected by
most aldehydes, alkalis, ethers, or hydrocarbons,
but is deteriorated by dilute acids (e.g.,
hydrochloric acid and sulphuric acid in
10% concentrations at room temperature
cause a noticeable loss in breaking strength
in 10 hours).
- Solvents for nylon include:
- Concentrated formic acid
- Phenolic compounds at room temperature
- Calcium chloride in methanol at room
temperature
- Hot solutions of calcium chloride in:
Glacial Acetic Acid
Ethylene Chlorohydrin
Ethylene Glycol
- Hot solutions of calcium chloride in:
Glacial Acetic Acid
Ethylene Chlorohydrin
Ethylene Glycol
- Hot solutions of zinc chloride in:
Methanol Benzyl Alcohol at the boil
- Aramids are resistant to most weak acids
and alkalis, ketones, alcohols, hydrocarbons,
oils and dry cleaning solvents. Strong
acids and bases and sodium hypo-chlorite
bleach attack aramids, particularly at
high temperatures of high concentrations.
- K-Spec™ core yarn strength retention
is based on test results of components at 65°C/150°-F
(or less) for 6 months. K-Spec™ has a
100% strength retention when exposed to: Age,
10% detergent solution, rot and mildew, sunlight
and Toluene; 99% strength retention when exposed
to: acetic acid, gasoline, hydrochloric acid
1m, hydraulic fluid, kerosene, and sea water;
98% retention when exposed to: 25% ammonium
hydroxide, 10% hypophosphite solution, and
40% phosphoric acid; 97% retention when exposed
to 5m sodium hydroxide; 95% retention when
exposed to Portland cement and sulfuric acid;
and 88% retention when exposed to Clorox®,
and nitric acid.
|
|
|
|
