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Plastic Mold Design Guidelines
Wall thickness
With injection-molded parts, observing proper (and uniform) wall thickness helps parts avoid potential issues such as sink marks and warpage. Recommended thicknesses vary by material:
| Resin | Inches |
| ABS | 0.045 - 0.140 |
| Acetal | 0.030 - 0.120 |
| Acrylic | 0.025 - 0.500 |
| Liquid crystal polymer | 0.030 - 0.120 |
| Long-fiber reinforced plastics | 0.075 - 1.000 |
| Nylon | 0.030 - 0.115 |
| Polycarbonate | 0.040 - 0.150 |
| Polyester | 0.025 - 0.125 |
| Polyethylene | 0.030 - 0.200 |
| Polyphenylene sulfide | 0.020 - 0.180 |
| Polypropylene | 0.025 - 0.150 |
| Polystyrene | 0.035 - 0.150 |
| Polyurethane | 0.080 - 0.750 |
| PM-F0: | Non-cosmetic: finish to Protomold discretion |
| PM-F1: | Low-cosmetic: most toolmarks removed |
| PM-F2: | Non-cosmetic: Protomold discretion, EDM finish and/or toolmarks permissible |
| SPI-C1: | 600 grit stone, 10-12 Ra |
| PM-T1: | Protomold texture, SPI-C1 followed by light bead blast |
| PM-T2: | Protomold texture, SPI-C1 followed by medium bead blast |
| SPI-B1: | 600 grit paper, 2-3 Ra |
| SPI-A2: | Grade #2 Diamond Buff, 1-2 Ra |
| Width | Height | Pull |
| ≤ 8.419 in | ≤ 2.377 in | ≤ 2.900 in |
| ≤ 213.84mm | ≤60.38mm | ≤73.66mm |




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