RapidDirect SPI Surface Finish Services

The VDI 3400 Standard is a German guideline that specifies a series of surface textures for plastic mold tools. It provides a classification system for surface finishes, similar to the SPI (Society of the Plastics Industry) finish standards commonly used in the United States.
The VDI 3400 Standard categorizes surface textures based on numerical codes and descriptions, allowing for consistent communication and specification of desired surface finishes in plastic molding applications. By adhering to this standard, manufacturers can achieve the desired aesthetic and functional properties in molded plastic parts, ensuring consistency and quality across production processes.

To judge the surface quality of a mold, use optical interference technology to assess if the surface has accurate geometry and the absence of long wavy undulating patterns, which can indicate surface imperfections. After mirror treatment, visually inspect the surface for scratches, holes, or other defects that could affect the appearance and quality of the final part. Ensure the surface is smooth and uniform, without blemishes or irregularities, to produce high-quality molded parts.