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This page provides information
on the Ace polyethylene tank materials including chemical service
temperatures, ultraviolet light exposure, environmental stress crack
resistance, specific gravity, material color, FDA complaince, and
NSF compliance.
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Chemical Service
Temperatures
Continued or prolonged service with certain chemicals at elevated
temperatures may reduce the life of a polyethylene tank. The effects
of the temperature on the polyethylene will depend on the chemical
chemistry, chemical specific gravity, size and model of tank the
chemical is to be stored in, and the tank wall thickness. Consult
the chemical manufacturer for recommendations regarding storage
in polyethylene tanks and service temperature limits.
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Ultraviolet
Light Exposure
Ace Roto-Mold tanks are molded from polyethylene compounded with
the latest technology in ultraviolet (UV) light stabilizers. These
UV stabilizers will reduce the harmful effects of ultraviolet light
exposure and are intended to extend the life of a tank over similar
materials that are not compounded with stabilizers.
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Stress Crack Resistance (ESCR Rating)
ESCR is a method utilized
to evaluate or test processed polyethylene for stress crack resistance
when exposed to a chemical for a given amount of time. Most polyethylene
resins are rated according to an ESCR value that is specified in
the material specifications data supplied by the resin supplier.
Certain chemicals, although having no direct chemical effect on
polyethylene, may accelerate cracking under mechanical stresses.
Elevated temperatures may also effect polyethylene cracking. Although
all processed polyethylene resins are subject to stress cracking,
some are more resistant to it than others. Please reference the
material data specifications for ESCR ratings for the tank model
selected. To reduce the effect of ESCR, proper care should be taken
to reduce stress at fittings, bands, tie down lugs, etc. |
Specific
Gravity
Specific Gravity is the ratio of the chemical weight
per gallon divided by the weight of water per gallon (8.33 lbs per
gallon). As an example, if a chemical weighs 10 lbs per gallon, the
specific gravity of the chemical is 10.0/8.33 = 1.2. |
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Material
Color
The standard color for
most Ace Roto-Mold tanks is natural (translucent white). Yellow
is the standard color for crop care tanks, septic tanks, and liquid
feeders. Spot sprayer and vertical tanks may be inventoried in both
natural and yellow. Standard stock tanks are spruce green. All tanks
may be ordered in non-standard colors such as yellow, black, or
green as an option. |
FDA
Compliance
Ace Roto-Mold tanks are
manufactured utilizing FDA compliant resins. Natural, black, and
green colored tanks are in full compliance with current FDA standards
for polyethylene tanks. However, certain colors when blended into
the resin, may effect this compliance. Consult the factory regarding
other colors and FDA compliance. Please specify on your tank order
if FDA compliance is required and we will assist in your selection. |
NSF
Compliance
National Sanitary Foundation (NSF)
compliance considers a number of factors for approval. Among these
are material and final configuration of the product including fittings
and accessories that are exposed to the chemical. For this reason,
please consult the factory regarding NSF approval. |
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