Potassium tetraborate tetrahydrate
Potassium tetraborate tetrahydrate (CAS: 12045-78-2), with the molecular formula K2B4O7 · 4H2O and a molecular weight of 305.50, is a potassium salt of tetraboric acid. This white crystalline solid is primarily utilised in analytical chemistry as a reagent. It is an important compound in various laboratory applications, particularly where precise chemical formulations are required for accurate testing and research.
- IUPAC
- Potassium biborate

Analytical Reagent
Potassium tetraborate tetrahydrate serves as a crucial reagent in analytical chemistry. Its defined composition allows for accurate titrations and standard preparations in laboratory settings.
Chromatography
This compound finds application in chromatography as a component of mobile phases or as a derivatizing agent. It aids in the separation and analysis of various chemical compounds.
Decomposition Reagent
In specific analytical procedures, potassium tetraborate tetrahydrate can be employed as a decomposition reagent. It assists in breaking down complex samples for subsequent analysis.
Boron Source
It acts as a source of boron in various chemical syntheses and formulations. This is valuable in research and development requiring controlled introduction of boron.
| Molecular weight | 305.50 |
|---|---|
| Linear formula | K2B4O7 · 4H2O |
| Assay | ≥99.0% (T) |
| Grade | purum p.a. |

Hazard statements
- H360FD
Precautionary statements
- P281Use personal protective equipment as required
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 60-61 |
| Safety statements (S) | 53-45 |
| Cation traces | Ca: ≤50 mg/kgCd: ≤50 mg/kgCo: ≤50 mg/kgCu: ≤50 mg/kgFe: ≤50 mg/kgNa: ≤5000 mg/kgNi: ≤50 mg/kgPb: ≤50 mg/kgZn: ≤50 mg/kg |
| Anion traces | chloride (Cl-): ≤50 mg/kgsulfate (SO42-): ≤50 mg/kg |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Potassium tetraborate tetrahydrate used for?
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Potassium tetraborate tetrahydrate is used as an analytical reagent, in chromatography, as a decomposition reagent, and as a source of boron in chemical syntheses.
What is the CAS number and formula for Potassium tetraborate tetrahydrate?
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The CAS number is 12045-78-2 and the linear formula is K2B4O7 · 4H2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Potassium tetraborate tetrahydrate in Purum p.a. grade with an assay of ≥99.0% (T). We do not represent this product as USP, BP, or EP grade.
What are the main safety concerns when handling this chemical?
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This compound is classified as Danger, with the hazard statement H360FD indicating it may damage fertility and the unborn child. Always use appropriate personal protective equipment, including dust masks (type N95 US), eyeshields, and gloves, and handle in a well-ventilated area.
How is Potassium tetraborate tetrahydrate packed, shipped, and exported?
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Tech Serve Solutions specialises in the global supply and export of fine chemicals, ensuring appropriate packaging and adherence to international shipping regulations for safe and compliant delivery.
How can I request a sample or quote for Potassium tetraborate tetrahydrate?
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Please contact our sales team directly via our website or by phone to request a sample or obtain a quotation for Potassium tetraborate tetrahydrate.
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