HDPE Seaboard® marine sheet is a high density polyethylene sheet formulated to meet the specific requirements of marine and other outdoor environments. In addition, special post-production treatment enhances its ability to withstand the effects of salt water, moisture and direct sunlight. CPG Seaboard® is manufactured as a continuous extrusion. It is not press laminated. Thus, it is unconditionally guaranteed not to delaminate during the service life of the end-product. Lead-time may apply for this item. Weight per 54″ x 96″ Sheet: .250″ (1/4″) = 45 lbs .375″ (3/8″) = 68 lbs .500″ (1/2″) = 90 lbs .625″ (5/8″) = 113 lbs .750″ (3/4″) = 135 lbs 1.00″ (1.0″) = 180 lbs – Sheets may also be cut-down for UPS at customer’s request to reduce freight costs.