King Plastic Lumber/Polymer

King Plastic Polymer Lumber: The Wood Alternative Built to Last

When wood rots, warps, or splinters, builders and fabricators across marine, construction, and outdoor industries turn to King Plastic for a better answer. King Plastic Corporation has been manufacturing high-density polyethylene (HDPE) polymer sheets since 1968, and their Lumber/Polymer products represent the heart of that legacy — material engineered to perform everywhere traditional lumber falls short.

Why Polymer Lumber Outperforms Wood

The case for polymer lumber starts with what it won't do. King StarBoard® will not rust, delaminate, or rot when exposed to UV, humidity, or water. Unlike teak or other marine-grade woods, it will not delaminate like wood laminates. For builders working in saltwater environments, outdoor kitchens, or high-moisture settings, this durability is transformational. Nearly every polymer sheet manufactured by King Plastic is UV stabilized in both the resin and the color, helping the material resist fading, chalking, and surface degradation.

Proprietary Technology: The K-Stran™ Advantage

What sets King Plastic's polymer lumber apart from generic HDPE sheet stock is its proprietary manufacturing process. King StarBoard® is the product of a proprietary process called K-Stran™, the most advanced manufacturing process for superior flatness and consistency. Precise tolerances ensure consistent color, thickness and density, even for special thickness gauges and custom order colors. This level of manufacturing control means fabricators get predictable, repeatable results whether they're cutting a single panel or running a full production run.

Works Just Like Wood — Without the Maintenance

One of the most compelling aspects of King Plastic's polymer lumber is its fabrication-friendly nature. The polymer sheet never needs painting or refinishing, works like wood, and is easy to fabricate with common woodworking tools and techniques. Handled like finished plywood, polymer sheet stock can be bent, cut, routed, welded and so much more. That means no specialized equipment investment — your existing saws, routers, and drill bits translate directly.

A Range of Products for Every Application

King Plastic's polymer lumber lineup spans a broad spectrum of needs. King StarBoard® is the original marine-grade high-density polyethylene sheet and the leading brand in the marine industry. For builders who want aesthetics alongside performance, King StarBoard® WG has a wood grain finish on both sides of the sheet, is environmentally stabilized to withstand the harshest outdoor conditions, and will not rust, delaminate or rot when exposed to UV, humidity or water. King StarBoard® XL is a lightweight, marine-grade, cellular high-density polyethylene sheet that is up to 30% lighter than the original King StarBoard®. For budget-conscious projects, King StarLite® XL is an economical, cellular (closed cell), utility sheet made from select high-grade King StarBoard® recycled high-density polyethylene.

Proven Across Demanding Industries

Quality polymer sheets from King Plastic Corporation are ideal for all types of commercial and residential outdoor cabinets, furniture and storage, restroom partitions, signage, lockers — even antimicrobial furnishings for healthcare environments. King Plastic Corporation pioneered the first marine-grade polymer sheet, King StarBoard®, which remains the dominant brand in the marine industry today. That pioneering heritage backs every sheet in this lineup, giving fabricators and builders confidence that the material behind their project has been refined over decades of real-world use.