Chemical Appearance:
This solution is a clear, colorless liquid, typically free from any suspended solids or particulate matter given its high purity.
- It is quite viscous, more so than water, due to the high concentration of sodium hydroxide.
- It has a slippery feel, which is characteristic of alkaline solutions, and should be handled with care to avoid contact with skin.
- As a hygroscopic substance, it will readily absorb moisture and carbon dioxide from the air, which could lead to the formation of sodium carbonate, causing the solution to become cloudy over time.
Chemical Applications:
– Electronics Industry: Due to its purity, electronic grade sodium hydroxide is used in the cleaning and etching of semiconductors and printed circuit boards. It removes photoresist and other residues without damaging the delicate electronic components.
– Laboratory Reagent: High purity sodium hydroxide is essential for sensitive analytical procedures where contaminants could affect the results.
– Pharmaceuticals: It’s used in the pharmaceutical industry where high purity is necessary for the manufacturing of active pharmaceutical ingredients (APIs) and excipients.
– Biodiesel Production: Sodium hydroxide can act as a catalyst in the transesterification process for producing biodiesel from vegetable oils or animal fats.
– Food Processing: Although less common due to its strength, it can be used in certain food processing applications where a strong base is required under controlled conditions.
-Cleaning and Degreasing: It is effective for cleaning stainless steel and glassware in environments where residue from lower purity sodium hydroxide could contaminate the next process, such as in breweries or laboratories.
Specification
| inspection standard | manufacturer’s standard | |
| inspecting item | Standard requirements | The measured results |
| content,% | ≥50.0 | 50.2 |
| surface | Colorless transparent liquid | Colorless transparent liquid |
| Carbonate (in Na2C03),% | 1.0 | 0.2 |
| clarity test | qualified | qualified |
| Chloride (C1), ppm | ≤50 | <50 |
| Sulphate (S04), ppm | ≤30 | <30 |
| Phosphate (P04), ppm | ≤20 | <20 |
| Total nitrogen content (N), ppm | ≤10 | <10 |
| Silicate (Si03), ppm | ≤100 | <100 |
| Magnesium (Mg), ppm | ≤20 | <20 |
| Aluminum (Al), ppm | ≤20 | <20 |
| potassium (K),ppm | ≤5000 | <5000 |
| Calcium (Ca), ppm | < 20 | <20 |
| Iron (Fe), ppm | ≤5 | <5 |
| Nickel (Ni), ppm | ≤1 | <1 |
| Zinc (Zn), ppm | 10 | <10 |
| Heavy metals (in Pb), ppm | < 10 | |
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