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.


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.



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


Product Material(s) LMD Morale Requires
Polyester Lump.png
Polyester Pack.png
Loxic Kohl.png
300 4 Level 3 Workshop

See also