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Comparison Table of Injection Mold Surface Finish
Below is the comparison table of injection mold surface finishes for your check and reference. If you have any other questions, please feel free to contact us!
Comparison of Surface Roughness Between China and the United States
| Traditional Chinese Standard (Smoothness) | China’s New Standard (Roughness) Ra | American Standard (Micrometer) Ra | American Standard (Microinches), Ra |
| ▽ 4 | 6.3 | 8 | 320 |
| 6.3 | 250 | ||
| ▽ 5 | 3.2 | 5 | 200 |
| 4 | 160 | ||
| 3.2 | 125 | ||
| ▽ 6 | 1.6 | 2.5 | 100 |
| 2 | 80 | ||
| 1.6 | 63 | ||
| ▽ 7 | 0.8 | 1.25 | 50 |
| 1 | 40 | ||
| 0.8 | 32 | ||
| ▽ 8 | 0.4 | 0.63 | 25 |
| 0.5 | 20 | ||
| 0.4 | 16 |
Conversion of Chinese Surface Finish and Surface Roughness Ra, Rz Values
| Surface Finish | ▽1 | ▽2 | ▽3 | ▽4 | ▽5 | ▽6 | ▽7 | |
| Surface Roughness | Ra | 50 | 25 | 12.5 | 6.3 | 3.2 | 1.6 | 0.8 |
| Rz | 200 | 100 | 50 | 25 | 12.5 | 6.3 | 6.3 | |
| Surface Finish | ▽8 | ▽9 | ▽10 | ▽11 | ▽12 | ▽13 | ▽14 | |
| Surface Roughness | Ra | 0.4 | 0.2 | 0.1 | 0.05 | 0.025 | 0.012 | / |
| Rz | 3.2 | 1.6 | 0.8 | 0.4 | 0.2 | 0.1 | 0.05 | |
Parameter Roughness Comparison of New and Old Standards
| New Standard (ISO) | Old Standard (ISO) | Explanation |
| Ra | Ra | Common parameters of each standard. |
| / | Rz | Displayed in Japanese Standard JIS. |
| Rz | Ry | The parameter definition has been modified. The original Ry is still displayed in the Japanese standard JIS and the German standard DIN. |
| Rq | Rq | Not change |
| Rp | Rp | Not change |
| Rv | Rm | The symbol is changed, but the parameter definition is not changed. |
| Rt | Rt | Not change |
| / | R3z | Displayed in Japanese standard JIS, the parameters have not changed. |
| / | Rmax | Displayed in German standard DIN, American standard ANSI. |
| RSk | Sk | The symbol has changed, but the definition has not changed. |
| RS | S | The symbol has changed, but the definition has not changed. |
| RSm | Sm | The symbol has changed, but the definition has not changed. |
| Rmr | tp | The symbol has changed, but the definition has not changed. |
International Standard Surface Roughness Processing Method
| Standard Grade code | Surface Roughness | Processing Tools (methods) | Processing Material and Hardness Requirements | Photometric Description | |||
| Coarse Grinding Grit Size | Fine Grinding Sand Particle Size | Diamond Paste Polishing | |||||
| SPI(A1) | Ra0.005 | S136 | 54HRC | Very high finish, mirror effect | |||
| 8407 | 52HRC | ||||||
| SPI(A2) | Ra0.01 | DF-2 | 58HRC | Low finish, no sandpaper texture | |||
| XW-10 | 60HRC | ||||||
| SPI(A3) | Ra0.02 | S136 | 300HB | One level lower finish, but no sandpaper texture | |||
| 718SUPREME | 300HB | ||||||
| SPI(B1) | Ra0.05 | No brightness, slight 3000# sandpaper texture | |||||
| SPI(B2) | Ra0.1 | No brightness, slight 2000# sandpaper texture | |||||
| SPI(B3) | Ra0.2 | No brightness, slight 1000# sandpaper texture, Unable to distinguish the direction of processing marks | |||||
| Ra0.4 | Finishing: Precision turning, precision planing, precision milling, grinding, reaming, scraping | Micro-distinguish the direction of processing marks. | |||||
| Ra0.8 | Finishing: Precision turning, precision planing, precision milling, grinding, reaming, scraping | Distinguishable direction of processing mark | |||||
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