American Extruded Plastics, Inc. ISO 9001:2015. Phone: 800-452-5533 Email: Address: 938 Reynolds Place; Greensboro, NC 27403 ISO Home Contact


Low Density Polyethylene (LDPE)

Low Density Polyethylene (LDPE) is known in consumer products by its SPI resin code "4." As indicated by it's name, LDPE has a lower density than HDPE, and is significantly more flexible, but what does this mean for your product?

LDPE has a lower tensile strength than HDPE because it's molecules are farther apart. Also, it is more resilient against alcohols, esters, and acids than HDPE, making it a widely popular material choice for containers and work surfaces.

An example of comparison between HDPE and LDPE is a gallon milk jug (check for the "2" SPI resin code to make sure it is HDPE!) and a collapsible camping water bag. LDPE is significantly more flexible and softer feeling than HDPE, so keep that in mind when considering this material.

If your product needs to hold corrosive material, maintain flexibility, or withstand temperatures under 176°F, LDPE may be a good choice. If you are not sure which material you would like to choose, please do not hesitate to call us at 800-452-5533 and we will be happy to help in any way that we can.

If you are interested more in the technical specifications of LDPE, please consult our data page.

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