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 compliance, and NSF compliance.
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. Depending
upon the chemicals to be stored, Ace Roto-Mold tanks will handle
sustained temperatures of up to 120° F (49° C) and intermittent
temperatures of up to 140° F (60° C). Consult the chemical manufacturer
for recommendations regarding storage in polyethylene tanks and service
temperature limits. Please note that higher service temperatures will
lower the specific gravity rating of the tank.
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. Our UV rating is
“15” on most product materials which generally means that after 15000
hours of exposure to the sun, there will be 50% of UV protection
remaining. Consult the factory for the specific UV rating of the product
you are using.
Environmental 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 is the ratio of the chemical weight per gallon
divided by the weight of water per gallon (8.33 lb. per gallon). As an
example, if a chemical weighs 10 lb. per gallon, the specific gravity of
the chemical is 10.0/8.33 = 1.2. (Metric: kilogram/cubic meter or
gram/liter) The Ace Roto-Mold standard tank has 1.7 specific gravity.
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.
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
(i.e. yellow) 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.
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
The information contained in this article is for general information purposes only. The information is provided by
United States Plastic Corp. and while we endeavor to keep the information up to date and correct, we make no representations or
warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with
respect to the website or the information, products, services, or related graphics contained on the website for any purpose.
Any reliance you place on such information is therefore strictly at your own risk.
In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss
or damage, or any loss or damage whatsoever arising from loss of materials, time or profits arising out of,
or in connection with, the use of this information.