Description
PVD salt, also known as PDV salt, is an acronym for “Pure Vacuum Dried” or “Pure Dried Vacuum” salt. It is a highly refined form of sodium chloride (NaCl) with a high degree of purity, often reaching 99.6% or more.
Chemical Properties
| Property | Value / Description |
| Chemical name | Sodium Chloride |
| Common name | PVD Salt (Pure Vacuum Dried Salt) |
| Chemical formula | NaCl |
| CAS number | 7647-14-5 |
| Chemical class | Inorganic salt |
| Molar mass | 58.44 g/mol |
| Appearance | White, crystalline solid |
| Odor | Odorless |
| Taste | Salty |
| Purity | ≥ 99.5% NaCl (typical) |
| Crystal structure | Cubic |
| Density | ~2.16 g/cm³ |
| Melting point | 801 °C |
| Boiling point | 1,413 °C |
| Solubility in water | Highly soluble (≈ 36 g/100 g water at 25 °C) |
| Solubility in organic solvents | Insoluble |
| pH (5% aqueous solution) | Neutral (≈ 6.5–7.5) |
| Hygroscopicity | Non-hygroscopic (free-flowing) |
| Reactivity | Stable; reacts with strong acids to release HCl |
| Chemical stability | Stable under normal storage conditions |
| Oxidizing / reducing nature | Neither oxidizing nor reducing |
| Flammability | Non-Flammable |
Uses
Food Processing and Food Grade Applications
Food Additive and Flavoring: PVD salt is widely used in the food industry for its clean, consistent taste. It’s used in baked goods, processed meats, sauces, and other food products.
Preservation: Its purity and consistent crystal structure make it an effective preservative, drawing moisture out of food and inhibiting bacterial growth.
Table Salt: Due to its high purity and free-flowing nature, it’s often a key component in commercial table salts, sometimes with the addition of iodine to prevent iodine deficiency.
Water Treatment
Water Softening: This is one of the most common applications. PVD salt is used in residential and commercial water softeners to regenerate the ion exchange resins. The purity of the salt is crucial here, as impurities can foul the resin and reduce the softener’s efficiency.
Brine Production: It’s used to create high-purity brine solutions for various industrial processes.
Textile and Dyeing: In the textile industry, PVD salt is used in the dyeing process to help “fix” the dye, driving it out of the solution and onto the fabric fibers. Its purity helps ensure the consistency and quality of the finished product.
Drilling Mud: In oil and gas exploration, PVD salt is added to drilling fluids (mud) to maintain the integrity of the wellbore, especially when drilling through rock salt layers.
Other Specialized Uses
Pharmaceuticals: Its high purity and lack of contaminants make it suitable for use in certain pharmaceutical formulations.
De-icing: While more expensive than rock salt, PVD salt is used for de-icing on specific surfaces like artificial turf and specialized sports courts, where the impurities in rock salt could cause damage to the latex or other materials.
Animal Nutrition: PVD salt is also used as a supplement in animal feed to ensure a proper intake of sodium.
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