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[edit]
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 Specialization training and the Elite 2 promotion of 5★ and 6★ Operators.
How to obtain[edit]
Store[edit]
Polyester Lumps are available in:
- Distinctions Store (sometimes) for 10
. - Headhunting Parametric Model Store for 80
.
Special drops[edit]
For the sake of convenience, only operations which have been released in the Global server are listed in the table below.
| 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 |
| 14-9 | 24 | Very Rare |
Workshop[edit]
| Product | Material | LMD | Morale | Requires |
|---|---|---|---|---|
 1 |
 2  1  1 |
300 | 4 | Level 3 Workshop |
See also[edit]
- Ester – T1 counterpart
- Polyester – T2 counterpart
- Polyester Pack – T3 counterpart