defining the degree of polish on the inner surfaces of the molds used to form plastic products. Measured from the top of the neck to the point where the diameter "T," extended down, intersects the shoulder. Measured from the top of the neck to the point where the diameter "T", extended down, intersects the shoulder.

Surface Finish Symbols, Callouts, and Standards. SPI is the short form of the Society of Plastic Industry, who establish standards for plastic industry and the SPI Plastic Engineering Handbooks is one of the most important reference for engineers. Various companies offer illustrative sample kits consisting of steel discs or strips … The SPI standards specify 12 grades of mold finish ranging from mirror-perfect to dull.

We provide mini ABS plastic cards to provide you reference or plaque samples of VDI 3400 Standard Texture and SPI Finish Standard. Take a look at the chart we assembled. In the United States, surface finish is usually specified using the ASME Y14.36M standard. "H" Dimension: The height of the neck finish.

Then, see how many times the threads pass one another to determine the finish. SPI Finish standard SPI A1 .

"S" Dimension. Each card includes 12 various VDI Texture or SPI Finish plaques. SPI Surface Finish Standards The SPI is that Society of the Plastics Industry sets standard for plastics industry in the United States that identifies the cosmetic quality of plastics, Upmold uses the SPI standard to define finish of plastic injection molded parts. SPI C1 . "S" Dimension: Measured from the top of the finish to the top edge of the first thread. How do these relate to SPI? SPI surface finish standard chart SPI surface finish chart for roughness technology SPI a1 is comparable to RA.0-1 made by #3 diamond buff SPI a2 is slightly finer than a1 and RA.1-2 made by #6 diamond buff SPI a3 has more imperfections than a2 and RA.2-3 made by #15 diamond buff . The SPI mold finish ratings allow you to specify a general mold surface finish. The Society of the Plastics Industry, or SPI, establishes standards for the United States plastics industry. Comparing with traditional metal plaque or book, plastic cards give you a real hand touch or visual texture look of what you will mold your plastic parts. SPI B1 . SPI defines the polishing standard on mold finish and widely applied in US markets. Measured from the top of the finish to the top edge of the first thread.


SPI B3 . SPI B2 . Finish SPI* standard Finishing Method Typical surface roughness Ra (μm) Super High Glossy finish: A-1: Grade #3, 6000 Grit Diamond Buff: 0.012 to 0.025: High Glossy finish: A-2: Grade #6, 3000 Grit Diamond Buff: 0.025 to 0.05: Normal Glossy finish: A-3: Grade #15, 1200 Grit Diamond Buff: 0.05 to 0.10: Fine Semi-glossy finish: B-1: 600 Grit Paper: 0.05 to 0.10 SPI Surface Finish Standards The SPI is that Society of the Plastics Industry sets standard for plastics industry in the United States that identifies the cosmetic quality of plastics, Upmold uses the SPI standard to define finish of plastic injection molded parts. SPI defines the polishing standard on mold finish and widely applied in US markets. In the U.S., most of us are very familiar with the Society of the Plastics Industry’s standard surface finish definitions, such as an A-1 diamond buff, C-1 Grit Stone or a B-2 Grit Paper finish. SPI finish standard plaques with black and clear materails for ABS and PC surface SPI surface finish standard with metal scale E: Plastic scale size: 120×65×2mm of SPI finish standard scale surface with black/clear color. Find a cap’s diameter, measuring from one side of the inner wall to the opposite side. The SPI is that Society of the Plastics Industry sets standard for plastics industry in the United States that identifies the cosmetic quality of plastics, Upmold uses the SPI standard to define finish of plastic injection molded parts. SPI Mold Classifications & SPI Mold Standards Society of the Plastic Industry Mold Building Standards The SPI Mold Classifications were developed by the U.S. Society of Plastic Engineers (SPE), with the intent of having a simplified definition of the type of injection tool for thermoplastics required for a set production need.

The height of the neck finish. SPI Neck Finish Specifications for Standard Closures "H" Dimension. The final part quality finish will vary with material and mold quality. SPI Neck Finish Specifications for Standard Closures "H" Dimension. High Quality, Optical Quality SPI Finish A-1 — Grade #3, 6000 Grit Diamond Buff; Measured from the top of the finish to the top edge of the first thread. SPI A2 .