Although both materials are polyethylene, they do have different properties. LDPE is softer, more flexible and melts at a lower temperature than HDPE. LDPE is used in sandwich bags and other types of packaging. HDPE is harder, has a higher chemical resistance and can withstand higher temperatures. Grafix stocks HDPE , not LDPE, although LDPE can be purchased on a custom order basis. Production minimums will apply. Talk with your sales rep to discuss your options.