What Is CAS:7789-75-5 (Calcium Fluoride)?
CAS:7789-75-5 is calcium fluoride, an inorganic compound with the chemical formula CaF2. I identify it as a white or colorless crystalline solid that is valued for its low water solubility, chemical stability, and optical properties. Its relative molecular mass is approximately 78.07 g/mol, and its reported melting point is about 1,418°C. At Azeal Materials, I supply calcium fluoride for industrial, laboratory, optical, ceramic, metallurgical, and fluorine-related applications, subject to the customer’s required grade and specification.
Key Takeaways About Calcium Fluoride
- CAS:7789-75-5 identifies calcium fluoride, also written as CaF2.
- It is a crystalline inorganic fluoride with low solubility in water.
- It can be used in optical materials, welding and metallurgical formulations, ceramics, glass, and chemical processing.
- Selection should be based on purity, particle size, impurity limits, moisture, packaging, and application requirements.
- A reliable supplier should clarify specifications, documentation, sample requirements, and export logistics before commercial supply.
What Is CAS:7789-75-5?
Calcium fluoride is the calcium salt of hydrofluoric acid and consists of calcium and fluoride ions in a crystalline lattice. The compound occurs naturally as the mineral fluorite, also known as fluorspar, while industrial products may be produced or processed to meet different purity and particle-size requirements. The CAS Registry Number 7789-75-5 is used to distinguish this substance from other calcium or fluoride compounds.
In its solid form, calcium fluoride is generally described as white, colorless, or pale crystalline material. It is not freely soluble in water; one commonly reported value is approximately 0.016 g per 100 mL of water at around 18°C, although solubility data can vary with temperature, pH, particle characteristics, and test method. Calcium fluoride can react under appropriate chemical conditions, particularly with strong acids, so safe handling requires a suitable risk assessment and applicable workplace controls.
Core Functions and Technical Characteristics
Low Water Solubility
The low water solubility of calcium fluoride can be useful when a fluoride-containing solid is required to remain relatively stable in aqueous systems. However, low solubility does not mean that the material is inert in every environment. Acidic conditions, complexing agents, elevated temperature, and process chemistry can influence its behavior, so I recommend evaluating the actual formulation rather than selecting the material by name alone.
Thermal and Chemical Stability
Calcium fluoride has a high melting point and is used in processes involving elevated temperatures. Its performance depends on purity, contamination control, atmosphere, heating profile, and contact with other ingredients. For this reason, a published melting point should be treated as a general reference, not as a guaranteed processing temperature for every industrial mixture.
Optical Transmission
High-purity calcium fluoride is known for its optical transmission across broad ultraviolet, visible, and infrared regions, which makes it relevant to optical windows, lenses, and specialty components. Optical applications usually require much tighter control of inclusions, absorption, crystal quality, surface condition, and orientation than general industrial applications. A material suitable for metallurgy may therefore be unsuitable for precision optics even when both products carry the same CAS number.
Application Scenarios for Calcium Fluoride
Optical and Photonics Components
Calcium fluoride is used in certain optical components because high-quality material can provide useful transmission in ultraviolet and infrared wavelengths. Typical applications may include windows, lenses, spectroscopy components, and other systems where low optical absorption is important. I recommend confirming wavelength range, crystal quality, dimensions, surface finish, and coating compatibility before requesting an optical-grade quotation.
Metallurgy, Welding, and Flux Formulations
Fluorspar or calcium fluoride can serve as a fluxing ingredient in metallurgical operations and welding-related formulations. Its role is determined by the complete formulation, furnace conditions, slag behavior, and impurity profile. Buyers should review calcium fluoride content, silica, carbonate, moisture, particle size, and other relevant limits because these factors can affect process consistency.
Ceramics, Glass, and Enamel Processing
Calcium fluoride may be incorporated into selected ceramic, glass, enamel, and mineral formulations to adjust melting behavior or material characteristics. The required grade depends on the product design and firing conditions. In these applications, consistent particle size and controlled impurities can be as important as nominal chemical purity.
Chemical and Laboratory Use
Laboratories and chemical manufacturers may use calcium fluoride as a reagent, starting material, fluoride source, or reference substance. The correct product should be selected according to the intended analytical or synthetic procedure. I encourage buyers to specify whether they need technical, industrial, reagent, high-purity, or optical material because the documentation and acceptance criteria may differ substantially.
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Types and Material Options
Calcium fluoride is not a single universal commercial specification. Natural fluorspar is typically classified and processed according to calcium fluoride content, associated minerals, moisture, particle size, and end use. Synthetic or specially refined calcium fluoride may be considered when a customer needs tighter control over impurities, morphology, or purity than a standard mineral product can provide.
Common Purchasing Categories
- Industrial or metallurgical grade: selected for fluxing and bulk process applications.
- Ceramic or glass grade: evaluated for chemical composition, particle size, and firing performance.
- Laboratory or reagent grade: selected according to analytical purity and documentation needs.
- High-purity grade: used where trace impurities may affect synthesis, processing, or performance.
- Optical-grade material: requires additional control of crystal quality, absorption, inclusions, and finished dimensions.
Key Specifications Buyers Should Review
When I prepare a calcium fluoride quotation, I first review the customer’s required chemical and physical specifications. Important chemical items can include CaF2 assay, calcium, fluoride, silica, carbonate, iron, heavy metals, and other application-specific impurities. Physical items may include powder or granule form, particle-size distribution, bulk density, moisture, color, and packaging.
| Specification Area | Why It Matters | Typical Buyer Question |
|---|---|---|
| CaF2 content | Indicates the main active component and supports grade comparison. | What assay range is required? |
| Particle size | Influences mixing, feeding, dissolution behavior, and dust control. | Is powder, granule, or a defined mesh size needed? |
| Impurity profile | May affect optical, chemical, ceramic, or metallurgical performance. | Which elements have maximum limits? |
| Moisture and packaging | Support storage stability and handling consistency. | What packaging and moisture limit are acceptable? |
How to Select the Right Calcium Fluoride
Start With the Application
I recommend beginning with the process rather than the product name. Define whether the material will be used in an optical component, furnace, welding electrode, ceramic batch, laboratory procedure, or chemical synthesis. Then identify the operating temperature, contact chemicals, required particle size, expected consumption, and consequences of impurity variation.
Match the Grade to the Risk
For bulk fluxing, a commercial grade may be appropriate if its chemical composition and physical form meet the process requirements. For optical or high-purity work, buyers may need lot-specific analysis, trace impurity data, and additional quality documentation. Selecting an unnecessarily high grade can increase cost, while selecting an insufficient grade can create rework, yield loss, or process instability.
Confirm Documentation and Supply Conditions
Before purchase, I suggest requesting a specification sheet, safety data sheet, certificate of analysis where available, packaging details, sample options, minimum order quantity, lead time, and shipping terms. These documents should be reviewed against the customer’s internal purchasing and quality requirements. I do not recommend relying only on a CAS number because the CAS number identifies the substance, not the commercial grade or complete performance specification.
How Azeal Materials Supports Buyers
At Azeal Materials, I support B2B buyers by clarifying the intended application and matching it with an appropriate calcium fluoride supply option. I can discuss purity levels, particle-size requirements, packaging formats, documentation, sample evaluation, and export arrangements based on the project scope. Where a standard specification does not fit, I can review whether a customized product discussion is practical.
My approach is to separate confirmed product information from application assumptions. I encourage buyers to provide their target assay, impurity limits, particle size, annual or trial quantity, destination, and required documents before requesting a final offer. This helps reduce specification misunderstandings and allows the supply plan to be evaluated more realistically.
Conclusion: What Is CAS:7789-75-5?
CAS:7789-75-5 is calcium fluoride, CaF2, a crystalline inorganic material with low water solubility, high thermal stability, and potential value in optical, metallurgical, ceramic, glass, laboratory, and chemical applications. The best grade depends on the application, not simply on the CAS number. Buyers should compare assay, impurities, particle size, moisture, packaging, documentation, and supply conditions before placing an order.
As a next step, send Azeal Materials your intended use, target specification, required quantity, destination, and documentation requirements. I can then help determine whether an industrial, ceramic, laboratory, high-purity, or optical-oriented calcium fluoride option is the most suitable starting point. This application-led approach provides a clearer basis for sampling, qualification, and commercial procurement.
Contact Azeal Materials for a calcium fluoride specification review and B2B supply discussion.