Rainstore3 - Issues Related to Resin “Creep”

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Courtesy of Invisible Structures, Inc.

For eight months prior to beginning construction of our first Rainstore3 injection mold, we worked closely with Stress Engineering to create the optimum structural design characteristics of the Rainstore3 form, including long term integrity and performance of the selected resins. For the best structural performance, chemical resistance, and lowest production (resulting in lowest market prices), we selected polyolefin resin materials – High Impact Copolymer Polypropylene and High Density Polyethylene.

Our major competitors in the stormwater storage market – steel and aluminum pipe and concrete pipe, have begun to notice our entry into the market and are raising the same “boogeymen” they raised when plastic pipe entered their realm – “Creep”. Creep is defined simply as: to slip or gradually shift position, or to change shape permanently from prolonged stress or exposure to high temperatures. All structural materials are subject to creep – some just react more slowly, or more gradually.

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