Call StormTech at
860.529.8188
or
888.892.2694
or visit our website at
www.stormtech.com
for technical and product information.
16
3.0 Structural Capabilities
3.4 INJECTION MOLDING
To comply with both the structural and design
requirements of AASHTO’s LRFD specifications and
ASTM F2787 as well as the product requirements of
ASTM F2418 or ASTM F2922, StormTech uses proprietary
injection molding equipment to manufacture the
chambers and end caps.
In addition to meeting structural goals, injection molding
allows StormTech to design added features and
advantages into StormTech’s parts including:
• Precise control of wall thickness throughout parts
• Precise fit of joints and end caps
• Molded-in inspection port fitting
• Molded-in handles on end caps
• Molded-in pipe guides with blade starter slots
• Repeatability for Quality Control (See Section 3.6)
Product Specifications: 2.1, 3.1 and 3.3
3.5 POLYPROPYLENE AND POLYETHYLENE RESIN
StormTech chambers are injection molded from
polypropylene and polyethylene. Polypropylene
and polyethylene chambers are inherently resistant
to chemicals typically found in stormwater run-off.
StormTech chambers maintain a greater portion of their
structural stiffness through higher installation and service
temperatures.
StormTech polypropylene and polyethylene are virgin
materials specially designed to achieve a high 75-year
creep modulus that is necessary to provide a sound long-
term structural design. Since the modulus remains high
well beyond the 75-year value, StormTech chambers can
exhibit a service life in excess of 75 years.
3.6 QUALITY CONTROL
StormTech chambers are manufactured under tight
quality control programs. Materials are routinely tested
in an environmentally controlled lab that is verified every
six months via the external ASTM Proficiency Testing
Program. The chamber material properties are measured
and controlled with procedures following ISO 9001:2000
requirements.
Statistical Process Control (SPC) techniques are applied
during manufacturing. Established upper and lower
control limits are maintained on key manufacturing para -
meters to maintain consistent product.
Product Specifications: 2.13 and 3.6
Summary of Contents for StormTech DC-780
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