Grindstone Pentahydrate
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Grindstone Pentahydrate
In Other Languages
Chinese
五水研磨石
Grindstone Pentahydrate is an upgrade material in Arknights.
Item description
An advanced grindstone used in the finish machining of weapon parts. Can be used for a variety of upgrades and the synthesis of D32 Steel.
Compared to normal Grindstone, this tool has an even more stable structure. It is highly non-reactive.
Usage
The second of the Grindstone-type upgrade materials, Grindstone Pentahydrate is similar but much more stable and non-reactive, thus making it more useful and essential for Operator skill Specialization training and the Elite 2 promotion of 5★ and 6★ Operators.
Due to its stability, the Grindstone Pentahydrate is an important material for the synthesis of D32 Steel.
How to obtain
Store
Grindstone Pentahydrates are available in:
- Distinctions Store (sometimes) for 10
. - Headhunting Parametric Model Store for 75
.
Special drops
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 |
|---|---|---|
| 4-8 | 21 | Very Rare (~5%) |
| 7-17 | 21 | Very Rare (~5%) |
| 12-8 | 21 | Very Rare |
| 13-21 | 24 | Very Rare |
| 14-5 | 21 | Very Rare |
Workshop
| Product | Material | LMD | Morale | Requires |
|---|---|---|---|---|
 1 |
 1  1  1 |
300 | 4 | Level 3 Workshop |
Trivia
- Pentahydrate is a suffix used for chemical compounds with five water molecules bound to it.
See also
- Grindstone – T3 counterpart