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 Specialization training and the Elite 2 promotion of 5★ and 6★ Operators.

Acquisition

Store

Polyester Lumps are available in:

  • Distinctions Store (sometimes) for 10 Distinction Certificate icon.png.
  • Headhunting Parametric Model Store for 80 Headhunting Parametric Model icon.png.

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
Polyester Lump.png
1
Polyester Pack.png
2
Aketon.png
1
Loxic Kohl.png
1
300 4 Level 3 Workshop

See also