Audited Supplier
| Requirements: | Specification: | Results: |
| Purity % ≥ | 98.0% | 98.1% |
| Matter Soluble in Water% ≤ | 0.25% | 0.22% |
| Chlorides% ≤ | 0.05% | 0.05% |
| Sulfate as PbSO4 %≤ | 0.2% | 0.15% |
| Acidity% ≤ | Nill | Nill |
| Alkalinity%≤ | Nill | Nill |
| Grit(Matter Insoluble in HNO3) ≤ | 0.05% | 0.045% |
| Sieving 120BS Sieve | 120BS | 120BS |
| Moisture%≤ | 0.05% | 0.05% |
It is an oxide where lead is in an oxidation state of +4. It is a dark-brown solid which is insoluble in water.
It exists in two crystalline forms. It has several important applications in electrochemistry, in particular as
the positive plate of lead acid batteries.
Lead dioxide is used in the production of matches, pyrotechnics, dyes and the curing of sulfide polymers.
It is also used in the construction of high-voltage lightning arresters.
Lead dioxide is used as an anode material in electrochemistry. β-PbO2 is more attractive for this purpose than
the α form because it has relatively low resistivity, good corrosion resistance even in low-pH medium, and a
high overvoltage for the evolution of oxygen in sulfuric- and nitric-acid-based electrolytes. Lead dioxide can
also withstand chlorine evolution in hydrochloric acid. Lead dioxide anodes are inexpensive and were once
used instead of conventional platinum and graphite electrodes for regenerating potassium dichromate. They
were also applied as oxygen anodes for electroplating copper and zinc in sulfate baths. In organic synthesis,
lead dioxide anodes were applied for the production of glyoxylic acid from oxalic acid in a sulfuric acid electrolyte.[13]
Lead acid battery
The most important use of lead dioxide is as the cathode of lead acid batteries. Its utility arises from the anomalous
metallic conductivity of PbO2. The lead acid battery stores and releases energy by shifting the equilibrium
(a comproportionation) between metallic lead, lead dioxide, and lead(II) salts in sulfuric acid.
