A guide providing design guidelines for injection‑molded parts using engineering thermoplastics from GE Plastics.
This design guide outlines best‑practice guidelines for creating injection‑molded components from engineering thermoplastics. It covers key topics such as wall thickness, parting lines, ejection, appearance surfaces, ribs, gussets, bosses, holes, depressions, and radii, fillets and corners.
The document provides specific recommendations on draft angles, material thickness ratios, feature dimensions, and tooling considerations to help designers achieve reliable molding, reduce stress concentrations, and improve part quality.
| Minimum draft angle on outer diameter | 0.5° |
|---|---|
| Rib thickness at intersection | 50‑60% of nominal wall |
| Maximum rib height | h = 3 × nominal wall thickness |
| Minimum radius for raised or recessed letters | 0.010 in |
Add 1° additional draft for each 0.001 in (0.025 mm) depth in texture.
For blind holes the length‑over‑diameter ratio should remain below 2 (up to 3 for diameters larger than 3/16 in).
Textured surfaces should stop at least 0.060 in (1.524 mm) or a minimum of 0.040 in (1.016 mm) from any parting line.