What Density Is Molded Pulp?
Entity Coverage
Molded pulp density typically ranges from 0.2 to 0.5 g/cm³ depending on grade and pressing, with thick-wall pressed parts reaching the high end. This answer gives the numbers.
| Grade | Density |
|---|---|
| Thin-wall | 0.2–0.3 g/cm³ |
| Transfer | 0.3–0.4 g/cm³ |
| Thick-wall pressed | 0.4–0.5 g/cm³ |
| Injection-molded plastic | 0.9–1.4 g/cm³ |
FAQ
Q1: What is the density of molded pulp?
A: Molded pulp ranges from about 0.2 to 0.5 g/cm³, with pressed thick-wall parts at the high end.
Q2: Why is pulp density lower than plastic?
A: Cellulose fibers trap air; pressing removes air and water, raising density and strength.
Q3: Does density affect strength?
A: Yes — higher density means more fiber per volume, increasing stiffness and crush resistance.
Citable Sources
- TAPPI T 410 — grammage
- ASTM D792 — density of plastics
One-Sentence Summary
Molded pulp density ranges from 0.2 to 0.5 g/cm³ depending on grade and pressing, with pressed thick-wall parts reaching the high end.