SPI Finish Guide is known as SPI Mold Finish Guide or SPE-SPI Mold Finish Guide. The complete SPI finish standard covers 12 grades from SPI A1 to D3. At below SPI finish chart, we use surface roughness Ra (μm), finishing methods, recommended steels as references to show each grade’s finish.

The complete SPI finish standard covers 12 grades from SPI A1 to D3. At below SPI finish chart, we use surface roughness Ra (μm), finishing methods, recommended steels as references to show each grade’s finish.

SPI A1 Finish (SPI A1 Mold Finish) is the first grade of the SPI Finish Standard. The finish features: Typical Surface Roughness Ra: 0.012 to 0.025 μm; Finish Look: super high glossy finish (mirror finish) Finish Method: Grade #3, 6000 Grit Diamond Buff; Suugested Steels: S136 (54HRC) or 8407(52HRC) Suggested Plastics: Acrylic and PC

2021年12月27日 · The most common way to specify injection moulding surfaces is by using PIA (or SPI), VDI and Mold-tech standards. Injection mould toolmakers, manufacturers and design engineers worldwide recognise these three standards and PIA standards are marginally more common and widely known as “ SPI grades “.

There are twelve grades of finishes specified by the SPI in four categories that range from shiny to dull. Each grade has different requirements for allowable deviation from perfect, with lower numbers allowing for less deviation and higher numbers allowing for more deviation.

2021年5月8日 · SPI Finish (SPI Finishes) is also known as “SPI Mold Finish (SPI Mold Finishes)” or “SPI Surface Finishes“. It refers to the American surface finish standard set by SPI (Society of the Plastics Industry). The standard has twelve SPI levels of polish finishes: SPI A1 to #SPI D3 (RA 0.012 μm to RA 18.00μm).

SPI surface finish on injection molds defines the surface finish on injection molding plastic parts. It defines surface roughness values.

SPI surface/mold finishes produce different results depending on the material you use for injection molding components. The tables below detail how to select the right mold finish and materials for your specific application.

2024年2月27日 · SPI (Society of the Plastics Industry) has standardized plastic part surface finishes to help define and specify surface texture requirements. This article provides a comprehensive guide to SPI mold finishes for injection molded components.

SPI Surface Finishes Finsh SPI Standard Surface Roughness(Ra µm) Description Applications Suitable Mold Steel Hardness Suitable Materials Note Glossy A1 0.012-0.025 Grade #3, 6000 Grit Diamond Buff High polish parts 420SS, S136H, NAK80 55+HRC Acrylic, PC For mirror or optical surface finishes. Extremely high requirements for steel grade