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Grindstone Pentahydrate
Grindstone Pentahydrate is an upgrade material in Arknights.
Compared to normal Grindstone, this tool has an even more stable structure. It is highly non-reactive.
Usage[edit]
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[edit]
Store[edit]
Grindstone Pentahydrates are available in:
- Distinctions Store (sometimes) for 10
. - Headhunting Parametric Model Store for 75
.
Special drops[edit]
| Operation
|
Sanity | Drop rate
|
|---|---|---|
| 4-8 | 21 | Very Rare (~4.5%)
|
| 7-17 | 21 | Very Rare (~4.5%)
|
| 12-8 | 21 | Very Rare (~4.3%)
|
| 13-21 | 24 | Very Rare (~4.5%)
|
| 14-5 | 21 | Very Rare (~4.4%)
|
| LE-6 | 21 | Very Rare (~4.3%)
|
| TW-8 | 21 | Very Rare (~3.5%)
|
| BI-8 | 21 | Very Rare (~3.5%)
|
Workshop[edit]
| Product | Material | LMD | Morale | Requires
|
|---|---|---|---|---|
 1 |
 1  1  1 |
300 | 4 | Level 3 Workshop
|
Trivia[edit]
- Pentahydrate is a suffix used for chemical compounds with five water molecules bound to it.
See also[edit]
- Grindstone – T3 counterpart