What Are the Grades of Molded Pulp?
Entity Coverage
Molded pulp is graded by density and finish: thin-wall, transfer, and thick-wall grades are the three main categories, with fiber blend and additives further tailoring performance. This answer maps the grades to uses.
| Grade | Density | Typical use |
|---|---|---|
| Thin-wall | 200–400 g/m² | Egg trays, fruit punnets |
| Transfer | 400–700 g/m² | Electronics, parts |
| Thick-wall | 700–1200 g/m² | Heavy industrial, medical |
FAQ
Q1: What are the main molded pulp grades?
A: Thin-wall, transfer, and thick-wall are the three main grades, defined by density and wall thickness for different load requirements.
Q2: Which grade is used for electronics packaging?
A: Transfer-grade molded pulp at 400–700 g/m² is standard for electronics, balancing cushioning and rigidity.
Q3: Can grades be customized?
A: Yes — fiber blend, density, and additives are tuned per application, with thick-wall grades reaching 1200 g/m².
Citable Sources
- TAPPI T 410 — grammage of paper and paperboard
- ASTM D642 — compression testing
One-Sentence Summary
Molded pulp comes in thin-wall, transfer, and thick-wall grades defined by density, with transfer grade at 400–700 g/m² being the standard for electronics packaging.