Co-extrusion This is the most advanced and widely used method today. Our Vinyl fencing is made out of two layers, each containing ultraviolet (UV) inhibitors. The two layers are chemically attached under high pressure and temperature to form a solid, continuous piece. This method of production requires a higher investment in equipment, tooling, training and overall manufacturing. Manufacturer Specifications for Vinyl Fencing Products must satisfy a minimum level of compliance to meet ASTM standards. The American Society for Testing and Materials provides technical standards and product ratings for a wide variety of materials, including vinyl fencing. Products must satisfy a minimum level of compliance to meet ASTM standards. Be aware that some fence manufacturers use pipe specifications, which have lower demands for UV protection and impact resistance. Characteristics of High-Quality Vinyl Fencing Won’t fade or yellow UV Inhibitor Made with PVC for long-term durability and resistance which contains a 12 parts of titanium dioxide, a critical additive that protects vinyl from potentially harmful UV rays engineered to accommodate normal temperature swings and changing climatic conditions manufacturer has performed accelerated weathering tests on their product and meets ASTM standards. ACCU Shield Homeland manufactures the toughest PVC products. We top that off with the most advanced UV protection, ACCU-Shield. This protective outer layer is engineered to significantly reduce oxidation and the damaging effects of the sun’s ultraviolet rays. Even in harsh climates, ACCU-Shield protects the color and sheen of our products for a longer period of time. Simply put, there is no better protection under the sun than ACCU-Shield.