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The Polyester Lump is an upgrade material in Arknights.

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

Special drops

Operation Sanity Drop rate
18 Sanity icon.png Very Rare (~3%)
18 Sanity icon.png Very Rare (~3%)

Workshop

Product Materials LMD Morale Requirements
Polyester Lump.png
1
Polyester Pack.png
2
Aketon.png
1
Loxic Kohl.png
1
300 LMD icon.png 4 Level 3 Workshop

See also

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