Potassium Binoxalate | CAS 127-95-7 High-Purity Potassium Hydrogen Oxalate for Rust Removal, Metal Cleaning, Analytical, and Industrial Applications

Potassium binoxalate (CAS 127-95-7), also known as potassium hydrogen oxalate, potassium acid oxalate, or potassium bioxalate, is a white crystalline powder widely used as an acidic reducing agent, chelating compound, and specialized cleaning reagent. With the molecular formula KHC₂O₄ and molecular weight 128.12 g/mol, this high-purity grade delivers consistent performance in professional cleaning, metal treatment, textile processing, and laboratory applications.

Key Product Specifications

  • CAS Number: 127-95-7
  • Chemical Name: Potassium hydrogen oxalate (Potassium binoxalate)
  • Molecular Formula: KHC₂O₄ (or C₂HKO₄)
  • Molecular Weight: 128.12 g/mol
  • Appearance: White crystalline powder or granules
  • Purity (Assay): ≥99.0% (titration)
  • Density: 2.0 g/cm³
  • Solubility: Freely soluble in water (approximately 22 g/100 mL at 20°C); slightly soluble in alcohol
  • pH (0.1 M solution): ≈2.7 at 25°C
  • Decomposition Temperature: Decomposes above 200°C without melting

This reagent-grade product maintains low levels of impurities (chloride <50 ppm, sulfate <100 ppm, insoluble matter <0.01%) for reliable and reproducible results across demanding applications.

Primary Applications and Uses

Potassium binoxalate functions effectively as an acidic chelator, mild reducing agent, and powerful stain remover. Common professional applications include:

  • Rust, Ink, and Stain Removal: Highly effective for removing rust, ink, coffee, and organic stains from metals, fabrics, wood, and stone surfaces.
  • Metal Cleaning and Polishing: Excellent for cleaning and brightening stainless steel, iron, copper, brass, and aluminum in precision manufacturing and maintenance.
  • Marble and Stone Polishing: Widely used in stone restoration and polishing formulations to remove stains and restore shine without damaging surfaces.
  • Textile and Dyeing Industry: Acts as a mordant to fix dyes on wool, silk, and cotton fabrics.
  • Analytical Chemistry: Standard reagent for redox titrations, standardization of potassium permanganate solutions, and precipitation reactions.
  • Leather Processing: Used in tanning and conditioning processes to control pH and remove impurities.
  • Photography: Effective for stain removal on prints and films, and as a component in certain specialized developers and clearing baths.
  • Wood Cleaning and Bleaching: Removes tannins, iron stains, and discoloration from wood surfaces prior to finishing.

Its acidic nature combined with strong chelating properties makes it superior for tasks where neutral oxalates are insufficient.

Why Choose This Potassium Binoxalate?

  • Exceptional Purity and Consistency: Meets or exceeds reagent-grade standards for reproducible laboratory and industrial performance.
  • Versatile Acidic Action: Combines reducing power with controlled acidity for superior stain removal and metal treatment.
  • Stable Crystalline Form: Easy to weigh, dissolve, and store with minimal dusting.
  • Professional-Grade Packaging: Supplied in moisture-resistant, airtight containers to preserve quality.
  • Expert Technical Support: Guidance on safe handling, solution preparation, and application-specific formulations.

Handling, Storage, and Safety Information

Potassium binoxalate is classified as harmful if swallowed (Acute Tox. 4) and causes skin irritation and serious eye irritation (Skin Irrit. 2; Eye Irrit. 2A). It is acidic and can release oxalic acid upon contact with strong acids.

Always use appropriate PPE: chemical-resistant gloves, safety goggles, protective clothing, and respiratory protection if dust is generated. Work in well-ventilated areas.

Storage Recommendations: Store in a cool, dry, well-ventilated place in tightly closed containers. Keep away from strong bases, oxidizing agents, and foodstuff. Shelf life is typically 24–36 months when stored properly.

First Aid: Rinse affected skin or eyes with plenty of water for at least 15 minutes. If swallowed, rinse mouth and seek immediate medical attention. Dispose of waste and empty containers according to local, regional, and national regulations.

Frequently Asked Questions (FAQs)

What is Potassium Binoxalate CAS 127-95-7 used for?

It is primarily used as a powerful rust and ink stain remover, metal cleaner, marble polisher, textile mordant, analytical titration reagent, and leather processing chemical.

What is the difference between potassium binoxalate and potassium oxalate?

Potassium binoxalate (KHC₂O₄) is the acidic monopotassium salt with pH ≈2.7, ideal for stain removal and acidic cleaning. Potassium oxalate (K₂C₂O₄·H₂O) is the neutral dipotassium salt with near-neutral pH, preferred for photographic developers and complexometric titrations.

Is Potassium Binoxalate effective for rust removal?

Yes. It is one of the most effective and widely used chemicals for dissolving iron oxide (rust) and restoring metal surfaces without excessive etching.

What is the purity level of this product?

This high-purity grade offers an assay of ≥99.0%, with strict control of chloride, sulfate, and insoluble impurities, suitable for both laboratory and industrial use.

How do I prepare a working solution of potassium binoxalate?

Dissolve the required amount in distilled or deionized water (e.g., 5–10% w/v solutions are common for cleaning). Stir until completely dissolved. Prepare fresh solutions for best results in critical applications.

Is Potassium Binoxalate safe for household or non-professional use?

This product is intended for professional, laboratory, and industrial use only. Proper training, PPE, and ventilation are required due to its irritant and toxic properties.

What packaging sizes are available?

Standard packaging includes 500 g, 1 kg, 5 kg, 25 kg, and bulk quantities in HDPE bottles or fiber drums, all designed to prevent moisture absorption and contamination.

Where can I buy high-purity Potassium Binoxalate CAS 127-95-7?

Contact a reliable specialty chemical supplier for competitive bulk pricing, COA, MSDS, and fast global delivery.

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