Polyester Lump
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The Polyester Lump is an upgrade material in Arknights.
Item description
A lump of polyester used in industrial production. Can be used for a variety of upgrades and for production in the Factory.
A refined material. As a product, it is mostly sold to organizations and research institutions that have extremely high raw material needs. It may become the basis of the next generation of materials.
Usage
The fourth of the Ester-type upgrade materials, these polymers derived from Polyester comes in even greater quantities and have many uses, which includes Operator skill Mastery training and the Elite 2 promotion of 5★ and 6★ Operators.
Acquisition
Store
Polyester Lumps are available in:
- Distinctions Store (sometimes) for 10
. - Headhunting Parametric Model Store for 80
.
Special drops
| Operation | Sanity | Drop rate |
|---|---|---|
| 3-8 | 18 | Very Rare (~3%) |
| 6-4 | 18 | Very Rare (~3%) |
| 9-7 | 18 | Very Rare |
| 12-18 | 21 | Very Rare |
| 13-12 | 21 | Very Rare |
Workshop
| Product | Material(s) | LMD | Morale | Requires |
|---|---|---|---|---|
 1 |
 2  1  1 |
300 | 4 | Level 3 Workshop |
See also
- Ester – T1 counterpart
- Polyester – T2 counterpart
- Polyester Pack – T3 counterpart