Citric Acid Anhydrous
Citric acid anhydrous E330 with under 0.5 percent moisture, for effervescent tablets, dry mixes and moisture-sensitive applications.
Key Specifications
| CAS number | 77-92-9 |
|---|---|
| E number | E330 |
| Assay | 99.5-100.5 percent |
| Moisture | ≤ 0.5 percent |
| Mesh | 30 / 60 / 80 |
| Bulk density | 0.8-1.0 g/ml |
Chosen for what it does not contain
The anhydrous form exists for its low moisture. In effervescent tablets a hydrate would release water and trigger premature reaction with bicarbonate, so anhydrous is mandatory there.
Cost premium and when it pays
It costs more per kilogram than the monohydrate, so it is specified only where moisture control genuinely matters rather than as a default.
Typical Applications
- Effervescent tablets — Combined with sodium bicarbonate, requires under 0.5 percent moisture.
- Dry beverage mixes — Where a hydrate would cause caking in the sachet.
Frequently Asked Questions
Can I substitute monohydrate?
Only in aqueous systems. In dry systems the water release causes caking or premature reaction.
Why is it more expensive?
Additional drying step after crystallisation.
What mesh for tablets?
30-60 mesh gives good flow and compressibility.
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