I created a realistic PBR procedural plastic shader, easily controllable with node group inputs. Available for free on my Gumroad, link in comments. : r/blender
Semi Transparent Plastic Shader Material in Blender Eevee Demo Tutorial - YouTube
Soft PVC Plastic in Blender - Nabesaka
Blend Swap | Glossy Plastic Shader (Cycles)
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Basic Rubber/Plastic material for Blender by Nikola3D on DeviantArt
Procedural Scratched Plastic | FREE 3D plastic materials | BlenderKit
Grainy Plastic Material - Materials and Textures - Blender Artists Community
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How i can make a plastic material like this in blender cycles? - Materials and Textures - Blender Artists Community