Core
Core is the side of the tool where the plastic part is injected from; also known as the bottom half of the tool.
The upper half of the mold is called CORE.
Core in mold design
Below are photos to show the cavity(s) in mold designs.
Core in actual plastic molds
Below are photos to show the cavity(s) in actual injection molds.
Core in design for manufacture
In our DFM report, we will analyze the core movement and parting line. You will need to confirm them before tooling.
Cavity steel
Plastopia use different cavity steel for specific production life. Here is a list for the mold steel we frequently use.
You may also see them in our quotation.
| Material | Applications | Rockwell Hardness | Surface Finish |
| H-13 Steel | Post-hardened steel for high volume molds | 48-52 Rc | Up to SPI A-1 |
| Nak 80 Steel | Pre-hardened tool steel for middle volume molds | 38-41 Rc | Up to SPI B-2 |
| P-20 Steel | Pre-hardened tool steel for middle volume molds | 28-32 Rc | Up to SPI B-2 |
| 718 Steel | Tool steel for low volume molds | 28-32 Rc | Up to SPI B3 / C-1 |
*Exceptional: if your parts are transparent or high polish required, we will have to use NAK 80 although you have a need of a lower volume production. For part material like PA+30GF, PLC and other corrosive materials, we will have to use H13.