Typical mold shrinkage for 35 resins, unfilled and filled, along (∥) and across (⊥) flow
| Resin | Unfilled, % | Filled, % |
|---|---|---|
| Nylon 6 (PA6) | 0.90 ∥ / 0.90 ⊥ constrained part 0.4 | n/a |
| Nylon 6, 30% glass | n/a | 0.30 ∥ / 0.75 ⊥ |
| Nylon 66 (PA66) | 1.50 ∥ / 1.80 ⊥ constrained part 0.81 | n/a |
| Nylon 66, 30–33% glass | n/a | 0.50 ∥ / 1.10 ⊥ |
| Nylon 11 (PA11) | 1.1 ∥ / 1.1 ⊥ | GF30: 0.2 ∥ / 0.8 ⊥ |
| Nylon 12 (PA12) | 1.1 ∥ / 1.2 ⊥ | GF30: 0.2 ∥ / 0.7 ⊥ |
| PPA | See grade sheet | See grade sheet |
| Polycarbonate (PC) | 0.70 / 0.75 (one producer) 0.5–0.7 (another) | 10–30% GF: 0.1–0.4 flow |
| PC/ABS | 0.5–0.9, near-isotropic | GF30: 0.15–0.35 ∥ / 0.30–0.50 ⊥ |
| ABS | 0.4–0.7 | n/a |
| SAN | 0.3–0.7 | 35% GF: 0.1 |
| ASA | 0.5 ∥ / 0.9 ⊥ | n/a |
| Acetal, POM homopolymer | 1.7–2.2 | n/a |
| Acetal, POM copolymer | 1.2–2.4 | Glass fill inverts the direction sense |
| PET, glass-filled | n/a | 30% GF: 0.1–0.3 flow |
| PBT, unfilled | 1.6–2.0 both directions | n/a |
| PBT, 30% glass | n/a | 0.30 ∥ / 1.10 ⊥ (one producer) 0.3–0.5 / 0.4–0.6 (another) |
| PEI | 0.5–0.7, genuinely isotropic | 30% GF: 0.20–0.40 both directions |
| PEEK | 0.9–1.3 ∥ / 1.1–1.5 ⊥ | GF30 cross-flow: 0.60 to 1.6 depending on supplier CF30 flow ≈ 0.0 |
| PPS | 1.2–1.4 ∥ / 1.5–1.9 ⊥ | 40% GF: 0.20 ∥ / 0.50–0.80 ⊥ |
| PSU | 0.6–0.7 | 30% GF: 0.29 ∥ / 0.46 ⊥ |
| PPSU | 0.6–1.0 | n/a |
| TPU | 0.5–2 (softer and thicker shrinks more) | GF: 0.05–0.2 ∥ / 0.1–0.5 ⊥ |
| Acrylic (PMMA) | ~0.4 typical 0.2–0.7 at extremes | n/a |
| GPPS | 0.3–0.8 | n/a |
| HIPS | 0.4–0.8 | n/a |
| PPO / PPE modified | 0.5–0.7 flow | 20% GF: 0.2–0.5 flow |
| Polypropylene homopolymer | 0.8–2.5 | 20% talc 1.10–1.50 · 40% talc 0.70–1.00 30% GF: 0.24 ∥ / 1.15 ⊥ |
| Polypropylene copolymer | 1.2–2.0 | n/a |
| HDPE | 1.70–2.90 | n/a |
| LDPE | 2.40–3.10 | n/a |
| Rigid PVC | 0.20–0.50 flow | Glass-reinforced: 0.05–0.15 |
| Flexible PVC | 1.0–3.0 softer shrinks more | Filled 1.8–2.1 vs unfilled 1.5–1.8 (50–70A) |
| TPE-S (SEBS) | 1.1–2.1 ∥ / 0.7–1.3 ⊥ | Filled grades shrink less |
| TPV | Hardness-indexed: 49A 4.1 ∥ / 0.7 ⊥ to 94A 1.5 / 0.7 | n/a |