Sodium Hydroxide - Reagent Grade Laboratory Reagent, 30g

The only thing that was slightly curious was that the label stated that tabs were inside the bottle. Actually it was a slurry based mix of partially dissolve tabs and water. But otherwise very strong and very useful in the use I needed, which was dissolving stuck on aluminum from my sharp carbide rotary bits. It took three days but I used a very small amount - 2 tabs in 100cc of water. The tabs are the size of coffee saccharin - approximately 5mm x 1.5mm.